On approval of the Instructions on the classification of reserves of deposits and forecast mineral resources, including those related to unconventional hydrocarbons

Home / Order / On approval of the Instructions on the classification of reserves of deposits and forecast mineral resources, including those related to unconventional hydrocarbons

Order of the Minister of Industry and Construction of the Republic of Kazakhstan dated April 28, 2026 No. 208. Registered with the Ministry of Justice of the Republic of Kazakhstan on April 30, 2026 No. 38601

In accordance with subparagraph 16-1) of Article 64 of the Code of the Republic of Kazakhstan "On Subsoil and Subsoil Use", I ORDER:

1. To approve the Instruction on the classification of reserves of deposits and forecast mineral resources, including those related to unconventional hydrocarbons.

2. To invalidate subparagraph 1) of paragraph 1 of the Order of the Acting Minister of Industry and Infrastructural Development of the Republic of Kazakhstan dated February 2, 2023 No. 71 "On Approval of the Methodology for Classifying reserves of deposits and forecast resources, instructions for calculating mineral reserves, including those related to unconventional hydrocarbons" (registered with the Ministry of Justice of the Republic of Kazakhstan under No. 31839).

3. The Committee of Geology of the Ministry of Industry and Construction of the Republic of Kazakhstan, in accordance with the procedure established by law, shall ensure:

1) the state registration of this order in the Ministry of Justice of the Republic of Kazakhstan;

2) posting of this order on the Internet resource of the Ministry of Industry and Construction of the Republic of Kazakhstan after its official publication.

4. Control over the execution of this order is entrusted to the supervising Vice Minister of Industry and Construction of the Republic of Kazakhstan.

5. This order shall enter into force upon the expiration of ten calendar days after the date of its first official publication.

Minister of Industry and Construction of the Republic of Kazakhstan

E. Nagaspayev

"APPROVED" by the Ministry of Water Resources and Irrigation of the Republic of Kazakhstan

Ministry of Energy of the Republic of Kazakhstan

Approved by the Order of the Minister of Industry and Construction of the Republic of Kazakhstan on April 28, 2026 No. 208

Instructions on the classification of reserves of deposits and forecast mineral resources, including those related to unconventional hydrocarbons

Chapter 1. General provisions

1. This Instruction on the classification of reserves of deposits and forecast resources of minerals, including those related to unconventional hydrocarbons (hereinafter referred to as the Instruction) has been developed in accordance with subparagraph 16-1) of Article 64 of the Code of the Republic of Kazakhstan "On Subsoil and Subsoil Use" (hereinafter referred to as the Code) and establishes uniform principles for the classification of reserves of deposits and forecast resources mineral resources according to the degree of study and development.

2. The classification of reserves of deposits and forecast resources of solid minerals provides for the differentiation of reserves and resources of solid minerals according to the degree of exploration, the degree of geological study, the complexity of the geological structure, and economic significance.

3. The classification of reserves of deposits and forecast hydrocarbon resources, including those related to unconventional ones, provides for the differentiation of reserves and resources of hydrocarbons by groups, categories, size, complexity of structure and degree of development of deposits in the development of deposits of hydrocarbons and associated components.

4. The classification of reserves of deposits and forecast groundwater resources establishes uniform principles for the assessment and state accounting of operational reserves and forecast groundwater resources according to the degree of their study and the readiness of deposits for further study and use, taking into account environmental and other restrictions in accordance with the requirements of the Code and the Water Code of the Republic of Kazakhstan (hereinafter – the Water Code).

5. The basic concepts used in these Instructions:

1) inactive balance sheet reserves – reserves that do not provide a return on investment, but the development of which is not unprofitable.;

2) off–balance sheet groundwater reserves - groundwater reserves, the use of which is not considered appropriate for the assessment period due to technical, economic, technological and environmental reasons not directly related to the water intake project (impossibility of land alienation, difficult mining and geological conditions, environmental restrictions, lack of rational technology for preliminary water treatment or extraction of valuable components, changes in socio-economic conditions, the need to regulate surface runoff, etc.);

3) balance reserves of groundwater – reserves of groundwater, the expediency of use, which is established taking into account all geological, economic, technological and sanitary-hygienic factors according to special feasibility studies, the possibility of use is confirmed by republican and territorial bodies coordinating and controlling in accordance with the procedure established by law issues of environmental management;

4) forecasted groundwater resources are the amount of groundwater of a certain quality and purpose, which is obtained within the hydrogeological region, river basin and administrative region and reflects the potential for their use;

5) operational groundwater reserves are the amount of groundwater that is obtained at a deposit (site) using geologically and technically sound water intake facilities under a given regime and operating conditions, as well as water quality that meets the criteria for targeted use during the estimated period of water consumption, taking into account environmental restrictions;

6) hydrocarbon deposits (deposits) under development – deposits where hydrocarbon production is carried out according to a projected development system;

7) hydrocarbon deposits (deposits) prepared for development – deposits where the study ensures the preparation of a project for the development of an oil or gas field;

8) a hydrocarbon deposit is a set of hydrocarbon deposits confined to one or more traps controlled by a single structural element and located on the same local area.;

9) a hydrocarbon deposit is a part of the subsurface containing an isolated natural accumulation of hydrocarbons in a trap formed by a reservoir rock and a tire of impermeable rocks.;

10) hydrocarbon reserves – the amount of hydrocarbons and associated components contained in them in identified, explored and developed deposits, reduced to standard (0.1 MPa and 20 ° C) conditions;

11) hydrocarbon resources – the amount of hydrocarbons and associated components contained in them as of the date of assessment of the proposed deposits that have not been discovered by drilling on established structures or on areas prepared for drilling, in lithological and stratigraphic complexes with proven or suspected oil and gas potential within large geostructural elements;

12) off–balance sheet hydrocarbon reserves are those that cannot be extracted profitably from the subsurface with the current state of technology and technology. Off-balance sheet reserves also include reserves that, in the case of low-quality hydrocarbons, low well productivity, limited reserves or particularly difficult operation, are not currently being developed, but are considered as an object for industrial development in the future.;

13) balance reserves of hydrocarbons – reserves of hydrocarbons that have already been explored and are being profitably extracted to the surface with the rational use of modern equipment and technologies.;

14) explored hydrocarbon fields (deposits) – fields where exploratory drilling is carried out, trial operation of individual exploration or advanced production wells in order to prepare the fields for development. Seismic surveys and additional exploration work may be carried out at the explored field.;

15) geological hydrocarbon reserves – reserves and resources of hydrocarbons located in the subsurface;

16) mothballed hydrocarbon deposits – deposits where exploration or production work has been temporarily stopped, and explored deposits where development is economically impractical for a certain period of time.,

17) reservoir testing – a complex of works carried out in order to cause inflow from the reservoir, sampling the reservoir fluid, assessing the nature of reservoir saturation and determining the approximate flow rate, confirmed by the Act of testing the reservoir in any form.;

18) a reservoir tester is a set of tools, apparatuses and devices put together to perform a number of functions during testing and measurements in the reservoir.;

19) active balance reserves of solid minerals are reserves, the extraction of which is advisable in a competitive market, where the average value of the annually extracted raw materials is sufficient to ensure the necessary return on investment;

20) off–balance sheet reserves of solid minerals - reserves of solid minerals, the use of which, according to approved conditions, at the date of calculation, is economically impractical or technically and technologically impossible.;

21) balance reserves of solid minerals – reserves of solid minerals, the use of which is economically feasible with the existing advanced technology being developed by industry, technology for extraction and processing of raw materials with rational and integrated use of mineral resources and environmental protection;

22) oil, gas and condensate extraction coefficients are values that show how much of the reserves or resources are extracted from the subsurface under the optimal mode of deposit development to the limit of economic profitability.;

23) well testing is the temporary operation of wells for research purposes, which provides for a complex of works that ensure the inflow, sampling of reservoir fluid and gas, identification of the oil and gas content of the reservoir, determination of the main hydrodynamic characteristics of the reservoir (reservoir pressure, hydroconductivity, productivity coefficient), confirmed by the Act of testing the well in any form.

Chapter 2. Classification of reserves of deposits and forecast resources of solid minerals

6. The classification defines a single procedure for calculating and state accounting of reserves and forecast resources of solid minerals in the subsurface, as well as criteria for reserves and resources belonging to the relevant categories, depending on the degree of their geological and economic study, the level of development of the feasibility study, as well as their economic significance. Reserves and forecast resources are subject to state accounting, which are confirmed by the state examination of the subsoil, taking into account the specifics provided for in paragraph 10 of Article 278 of the Code.

7. Reserves are calculated and accounted for separately for each type of solid minerals and areas of their appropriate commercial use, based on the results of appraisal, exploration and operational work. Mineral reserves in the subsurface are calculated without adjustments for losses and dilution during mining, ore processing and concentrate processing in accordance with economically reasonable condition parameters. The reliability of calculated mineral reserves is determined by comparing exploration and development data for non-exploited deposits using the control calculation method.

8. The quality of minerals is studied taking into account the need for their integrated use, the use of advanced mining and processing technologies. At the same time, the contents of associated valuable, toxic and harmful components in minerals, the forms of their location and distribution features in the products of enrichment and factory conversion are determined.

9. For complex deposits, reserves of the main and associated associated minerals (minerals, chemical elements and their compounds) that are economically feasible for extraction are subject to calculation and accounting. For valuable associated components that accumulate during enrichment in commodity concentrates or metallurgical conversion products, both gross and recoverable reserves are calculated and accounted for.

10. The estimated mineral resources are estimated by ore regions, nodes, fields, basins in general, as well as on the flanks and deep horizons of deposits, based on favorable geological conditions and reasonable analogies with known deposits.

11. The geological and economic assessment of reserves and forecast resources of minerals is carried out in accordance with the market economy and the conjuncture of mineral raw materials.

12. Reserves of solid minerals are calculated, forecasted resources are estimated in terms of mass or volume.

13. In accordance with these Instructions, depending on the degree of complexity of the geological structure, the study and economic significance of the reserves of solid minerals are divided into groups and categories, forecast resources into categories according to the degree of validity.

Paragraph 1. Categories of reserves and forecast resources of solid minerals

14. Reserves of solid minerals according to the degree of exploration are divided into categories C2, C1, B and A.

The projected resources of solid minerals are divided into categories P3, P2, and P1 according to the degree of their geological study.

15. The reserves of solid minerals are divided into two groups according to the degree of their study:

pre-estimated C2 reserves;

confirmed (industrial) reserves of categories C1, B, and A.

16. Category C2 solid mineral reserves meet the following conditions:

The size, shape, and internal structure of the mineral bodies and the conditions of occurrence are estimated from geological, geochemical, and geophysical data and confirmed by the discovery of the mineral by a rare network of exploration workings.;

The contour of mineral reserves is determined approximately in accordance with estimated and (or) industrial conditions based on testing of exploration workings and (or) by geologically justified extrapolation of parameters used in calculating reserves of high categories.;

The quality and technological properties of a mineral are determined based on the results of studies of single laboratory samples or evaluated by analogy with the studied areas of this deposit or a similar type of deposit.;

hydrogeological, engineering-geological, mining-geological, ecological and natural conditions were assessed based on data available in other areas of the field, observations in exploration workings and by analogy with known deposits in the area.;

Based on the results of studying the geological, technological, hydrogeological, engineering, geological and environmental conditions of the deposit or its site, a feasibility study of the estimated conditions is being developed. If the internal rate of return is positive and the parameters of the estimated conditions are approved, the reserves of the deposit or its site are calculated according to category C2.

17. The spatial location and quantity, as well as the ratios of proven reserves of solid minerals of categories C1, B, and A, are taken into account the specific geological features of the deposit, the construction conditions of the mining enterprise, and the accepted level of entrepreneurial risk of capital investments.

18. Category C1 stocks meet the following requirements:

the sizes and characteristic shapes of mineral bodies, the main features of the conditions of occurrence and internal structure were clarified, the variability and possible discontinuity of mineral bodies were estimated, and for reservoir deposits and deposits of construction and facing stone, and the presence of areas of intensive development of tectonic disturbances;

The contour of mineral reserves was determined in accordance with the requirements of industrial conditions based on the results of testing exploration workings, taking into account data from geophysical, geochemical studies and geologically sound modeling methods, delineation of ore bodies and linking ore sections.;

Based on the results of comprehensive work on the study of spatial variability of the material composition, textural and structural characteristics, physical, mechanical and technological properties of ores, isolation of technological types and grades of ores in the studied deposits, determination (prediction) of enrichment indicators and studies of standard and varietal laboratory technological samples, natural varieties and industrial (technological) types of minerals were determined., general patterns of spatial distribution and quantitative ratios of industrial (technological) types and varieties of minerals, mineral forms of useful and harmful components have been established; the quality of selected industrial (technological) types and varieties has been technologically studied according to all indicators provided by the conditions; recommendations for technological regulations have been developed;

The study of hydrogeological, engineering-geological, mining-geological, environmental and natural conditions allows us to characterize their main indicators in accordance with industrial and (or) estimated parameters of the limit values of natural indicators used for delineating, calculating and estimating reserves of various minerals.;

Based on the results of studying the geological, technological, hydrogeological, mining, geological, and environmental conditions of the deposit, a feasibility study of industrial conditions is being developed. If the internal rate of return is positive, the reserves of the deposit are calculated by industrial categories.

19. Category B solid mineral reserves meet the following conditions:

the sizes, main features and variability of the shape, internal structure and conditions of occurrence of mineral bodies, spatial placement of internal non-ore and substandard sites are established; in the presence of large discontinuous disturbances, the position and amplitudes of displacement are established, the possible degree of development of low-amplitude discontinuous disturbances is characterized.;

The contour of mineral reserves is determined in accordance with the industrial conditions for exploration workings with the inclusion (with sustained body capacity and mineral quality) of a limited extrapolation zone based on geological criteria, data from geophysical and geochemical studies.;

based on the results of studies of large-scale laboratory standard and varietal samples, natural varieties have been identified, industrial (technological) types of minerals have been identified and, if possible, outlined; mineral forms of useful and harmful components have been established, the quality of the identified industrial (technological) types and varieties of minerals has been technologically studied according to all indicators provided for by industrial conditions; the degree of technological knowledge is sufficient for the development of technological regulations;

The study of hydrogeological, engineering-geological, mining-geological, environmental and natural conditions allows us to qualitatively and quantitatively characterize their main indicators in accordance with industrial conditions.

20. The reserves of solid minerals of category A reserves meet the following conditions:

The size, shape and conditions of occurrence of mineral bodies have been established, the nature and patterns of changes in morphology and internal structure have been studied, non-ore and substandard areas inside mineral bodies have been identified and contoured, and in the presence of discontinuous disturbances, the position and displacement amplitudes are established.;

The contour of mineral reserves is determined without extrapolation in accordance with the requirements of industrial conditions through a network of exploration and production workings.;

based on the results of studies of semi-industrial and industrial standard and varietal samples, natural varieties have been identified, industrial (technological) types and grades of minerals have been identified and outlined, the composition, properties and distribution of valuable and harmful components by mineral forms have been established; the quality of selected industrial (technological) types and grades of minerals has been technologically studied according to all indicators provided by industrial conditions; the degree of technological knowledge is sufficient for the development of technological regulations;

hydrogeological, engineering-geological, mining-geological, ecological and natural conditions have been studied in detail, providing initial data for the preparation of a project for the development of the deposit.

21. To develop a feasibility study for industrial conditions, C2 reserves are used along with reserves of categories A, B and C1.

22. The reserves of complex ores and the main components contained in them are calculated according to the same categories. Stocks of associated components of industrial importance are calculated in the contours of the calculation of stocks of the main components and are categorized according to the degree of study, the nature of distribution, the forms of location and extraction technology.

23. Forecast resources of category P3 are the resources of expected deposits within potentially promising provinces, zones, and ore regions based on the determination of similarity measures with reference ore–bearing structures.

P3 category resources indicate the potential for the formation of deposits of a certain type of mineral based on favorable stratigraphic, lithological, tectonic, magmatic and other prerequisites. The quantitative assessment of the resources of the P3 category is carried out according to the estimated parameters based on analogy with the studied reference areas. When identifying promising forecast objects and assigning them quantitative parameters (the amount of resources, the expected contents of useful components), diagrams of unsuitable parameters calculated for the predicted type of deposits are used as guidelines for determining their potential significance.

24. Forecast resources of category P2 are the resources of proposed new deposits, the presence of which is justified by a combination of indirect geological, geophysical, and geochemical data and confirmed by the discovery of minerals in single workings. Resources of category P2 indicate the possibility of discovering new mineral deposits in a basin, area, ore node, ore field. The quantitative assessment of resources, ideas about the size of the proposed deposits, the mineral composition and the quality of ores are based on comparison with known analogues of deposits of the same genetic type. The geological and economic assessment of forecast resources of category P2 is carried out on the basis of comparing the predicted parameters with the corresponding parameters of industrially significant deposits of the same geological and industrial type or unsuitable parameters.

25. Forecasted resources of category P1 are the resources of new objects identified by the results of prospecting, or resources on the flanks (deep horizons) of explored and explored deposits, based on a set of data, including the opening of ore zones by surface mining and single or rare wells. The geological and economic assessment of the forecast resources of category P1 is carried out by calculations based on aggregated technical and economic indicators, if there are reserves of category C2 together with reserves of category C2.

The economic assessment of the forecast resources of category P1 in the exploited and explored fields is carried out in accordance with the parameters of the conditions adopted for the facility.

Paragraph 2. Grouping of deposits (sites) of solid minerals according to the complexity of the geological structure for exploration purposes

26. The appropriate degree of exploration of deposits (sites) prepared for industrial development is determined depending on the complexity of the geological structure and distribution of minerals, as well as economic factors dependent on them, such as the cost and time required for exploration. With this in mind, deposits or sections of large deposits that are planned to be developed by independent mining enterprises are divided into three groups.

The first group consists of deposits (sites) of simple geological structure, the majority of which (more than 70%) are contained in mineral bodies with undisturbed or slightly intact occurrence, sustained capacity, internal structure and quality of the mineral with a uniform distribution of the main valuable components in them.

The features of the geological structure of the deposits of the first group determine the possibility of identifying reserves of categories A, B, C1 and C2 during exploration.

The second group consists of deposits (sites) of complex geological structure, the majority of which (more than 70%) are characterized by variable capacity and internal structure of mineral bodies, disturbed occurrence, unrestrained quality of the fossil, uneven distribution of the main valuable components, deposits of simple geological structure, but with complex mining and geological conditions of development.

The features of the geological structure of the deposits of this group determine the possibility of identifying reserves of categories B, C1 and C2 during exploration.

The third group consists of deposits (sites) of very, very complex geological structure, the bulk of which (more than 70%) are characterized by sharp variability in capacity and internal structure, or intensively disturbed occurrence of mineral bodies or unrestrained quality of minerals and a very uneven distribution of the main valuable components. In the fields of the third group, it is impractical to identify reserves of categories A and B during exploration due to the high cost of exploration and its low efficiency. The reserves of the deposits (sites) of this group are explored mainly in categories C1 and C2.

Paragraph 3. Grouping of solid mineral deposits according to the degree of study

27. Mineral deposits are classified according to the degree of study into: estimated, explored and exploited.

The assessed deposits include quality, technological properties, hydrogeological and mining engineering conditions of development, reserves have been studied to the extent that makes it possible to justify the expediency of further exploration.

Explored deposits include deposits, quality, technological properties, hydrogeological and mining conditions for the development of reserves, which have been studied with sufficient completeness to resolve issues about the procedure and conditions for involving reserves in industrial development, design of construction or reconstruction on the basis of a mining enterprise.

The exploited fields include those involved in industrial development.

Paragraph 4. Grouping of solid mineral reserves by their economic importance

28. Reserves of solid minerals and the useful components contained in them are divided into two groups according to their economic significance, which are subject to separate calculation and accounting: balance sheet and off-balance sheet.

Balance sheet stocks are divided into two subgroups: active and inactive.

Off-balance sheet reserves are calculated and accounted for based on feasibility studies of conditions, which establish the possibility of their preservation in the subsurface for subsequent extraction or the expediency of associated production, storage and preservation for future use. When calculating off-balance sheet reserves, they are subdivided depending on the reasons for classifying reserves as off-balance sheet (economic, technological, hydrogeological or mining conditions).

29. Reserves of solid minerals contained in ore bodies, mineral deposits, left to prevent the collapse of the roof of sewage treatment plants, large bodies of water and watercourses, settlements, capital structures and agricultural facilities, nature reserves, monuments of nature, history and culture, are classified as balanced or off-balance on the basis of special technical and economic calculations. The technical and economic calculations take into account the costs of transferring facilities or special methods of working off reserves.

30. The balance sheet ownership of the reserves of the deposit is established by means of a feasibility study of the conditions for calculating mineral reserves based on the results of a state expert examination.

31. State-reviewed and positively assessed reserves are placed on the state balance sheet, including: balance sheet reserves in categories A, B, C1, C2, off-balance sheet reserves without categorization.

Paragraph 5. Classification of operational reserves and forecast groundwater resources

32. The operational reserves of groundwater are calculated and accounted for separately in accordance with the intended purpose (drinking, household, industrial, technological, therapeutic mineral, thermal, industrial, irrigation of lands) and the directions of their possible industrial use according to the data of hydrogeological prospecting and exploration works carried out at the deposits, as well as according to experience in the operation of existing water intake facilities.

The projected groundwater resources are estimated on the basis of general hydrogeological concepts, specialized area and regional studies.

33. Operational reserves and forecast groundwater resources that have passed state expertise in accordance with paragraph 5 of Article 89 of the Code are subject to State accounting.

34. Operational reserves and forecast resources of drainage and associated waters, the extraction of which is associated with the development of other types of minerals, as well as the use of subsurface resources for other purposes not related to mining, are subject to state geological expertise and state accounting in accordance with the possibilities of their further use, the need for discharge and assessment of the impact on the environment.

35. The quality of drinking, industrial, technical and therapeutic mineral waters is assessed in accordance with the requirements of State and industry standards, technical conditions of water use and the requirements of water-consuming organizations. Conditions for therapeutic mineral waters are issued by specialized organizations authorized by the health authorities.

The use of groundwater suitable for drinking water supply for other purposes is not allowed, except in the absence of other sources of water supply and when these groundwater are not an alternative source of drinking water supply.

Mineral waters classified as medicinal are used primarily for balneological purposes. In exceptional cases, a permit for the use of medicinal mineral waters for other purposes is issued by specially authorized state bodies.

The quality of industrial and thermal energy waters is assessed in accordance with the conditions developed based on the application of the most rational and efficient methods of extraction and processing of these waters in compliance with the requirements for their integrated use and environmental protection.

Operational reserves and projected groundwater resources are estimated and accounted for in cubic meters per day. In industrial waters, the amount of main and associated components (in tons) is determined, which is obtained at the deposit during the estimated period of its development, excluding losses during water processing. In addition to operational reserves, the thermal power capacity of the field is also estimated for thermal power water deposits (in gigajoules per year, tons of conventional fuel).

Paragraph 6. Grouping of groundwater deposits (sites) according to the degree of their study

36. Groundwater deposits (sites) are divided into developed, explored and assessed (identified) according to the degree of their study.

Developed deposits include deposits (sections) of groundwater that are in constant or periodic operation, the operational reserves of which, their quantity and quality, as well as the conditions of water extraction are established based on data from routine observations, sanitary and hygienic, water protection and environmental surveys (operational exploration). The groundwater reserves of the developed deposits (sites) are estimated according to category A and, in some cases, category B.

Explored deposits (sites) include those that have been studied to a sufficient extent to justify a decision on the procedure and conditions for their involvement in industrial development. Groundwater reserves of explored deposits (sites) are estimated according to category B and, in some cases, categories B + C1, if the reserves of category C1 do not exceed 20%.

The assessed (identified) deposits (sites) are those that have been studied to the extent that, based on existing needs or extensive technical and economic calculations, their industrial significance and the expediency of further exploration can be justified. The groundwater reserves of such deposits are calculated according to categories C1 and C2.

Paragraph 7. Categories of operational reserves and forecast groundwater resources

37. According to the degree of study, operational groundwater reserves are divided into developed categories A and B, explored categories B and assessed categories C1 and C2. The projected groundwater resources are classified as P in terms of their validity.

Each category of reserves serves as the basis for performing certain stages of design decisions to prepare deposits for further exploration and development.

38. Category A reserves are designed to assess the degree of development of explored groundwater reserves, draw up a project for the reconstruction of water intake and extend the right of use for a new period according to operational data and meet the following requirements:

calculated based on the results of operation (operational exploration), the duration of which is determined by the complexity of the conditions, the flow rate of water intake and lowering levels are determined based on data from routine observations in production and observation wells.;

their number corresponds to the actual water intake at the existing water intake, the possibility of maintaining it for the subsequent period of operation is confirmed by forecast calculations with a reliable quantitative assessment of the main sources of the formation of operational reserves.;

the quality of groundwater has been studied throughout the entire period of operation and meets the requirements of its intended purpose (standards, conditions), taking into account the applied methods of preliminary water treatment; the possibility of its preservation for the entire subsequent period of operation has been confirmed;

The technological properties of industrial and thermal energy waters have been studied in detail, ensuring the selection of the most rational technological schemes for their processing and complex extraction of valuable components.;

The impact of water abstraction on existing and explored water intakes and surface water sources has been reliably established from operational experience;

The impact of groundwater extraction on the environment has been assessed based on the results of regular routine observations to the extent that it is possible to establish the effectiveness of existing environmental protection measures, design and implement additional compensatory measures.

39. Category B reserves are the basis for the design of water intake and registration of documents for the use of groundwater and satisfy the following basic provisions:

calculated in relation to the agreed design schemes and structures of water intake facilities, the specified demand and schedule of water intake, taking into account the existing water management situation, its planned changes, and the specified permissible limits of impact on the environment.;

The reliability of the well design flow rates assumed when calculating reserves is confirmed by the results of drilling and pilot filtration operations, including, depending on the complexity of the conditions, conducting experimental single, cluster, group, pilot pumping or trial operation.;

A quantitative assessment of the sources of formation of operational groundwater reserves is given in relation to the accepted scheme of operation and the amount of water withdrawal.;

The quality of groundwater has been studied in all indicators in accordance with the requirements of the intended purpose; it has been proved that during the estimated period of water consumption, the quality of water will be constant or will vary within acceptable limits.;

Recommendations have been developed on the mode of operation of the water intake, the construction of a network of observation wells and the justification of sanitary protection zones (for drinking water).;

The technological properties of industrial and thermal energy waters have been studied in detail, providing initial data sufficient for designing a technological scheme for their processing or use; data has been obtained to establish the possibility of integrated use of waters and extraction of useful components of industrial importance.;

The impact of the planned water withdrawal during the estimated period of water consumption on existing and explored intakes and surface water sources is estimated.;

The possible impact of the development of the deposit (site) on the environment has been considered, the conditions for the discharge of used industrial, thermal and therapeutic mineral waters have been determined, and initial data have been obtained for the development of a draft of measures to prevent or reduce the level of negative environmental consequences.

40. Reserves of category C1 are intended to justify the feasibility of exploration of an underground water deposit, as well as the development of an exploration project. In some cases, C1 reserves serve as the basis for the field's involvement in operation.:

in difficult hydrogeological conditions, when achieving detailed knowledge of reserves for the allocation of category B is associated with high and unjustified costs.;

for facilities with low water demand (up to 1000 m3/day), with the exception of regional centers, as well as in terms of mineral water extraction;

for temporary water supply, if the service life does not exceed 10 years for facilities with a demand of more than 1000 m3/day;

In all cases, the study of the deposit makes it possible to reliably assess the impact of its development on the environment.

Category C1 stocks meet the following requirements:

calculated within the field or its sections in relation to the design scheme of water intake and the declared water demand;

for facilities with low water demand (up to 1000 m3/day), with the exception of regional centers, as well as in terms of mineral water extraction;

for temporary water supply, if the service life does not exceed 10 years for facilities with a demand of more than 1000 m3/day;

In all cases, the study of the deposit makes it possible to reliably assess the impact of its development on the environment.

Category C1 stocks meet the following requirements:

calculated within the field or its sections in relation to the design scheme of water intake and the declared water demand;

The reliability of the estimated flow rates used in calculating reserves is justified based on data from drilling individual wells and testing them with short-term trial and pilot pumping, depending on the complexity of the conditions.;

The sources of formation of operational groundwater reserves have been studied approximately to the extent that it is possible to assess the availability of groundwater extraction in relation to the accepted conventional water intake scheme.;

The quality of groundwater, as well as its changes during the estimated period of water consumption, have been studied to the extent that justifies the possibility of their intended use.;

The technological properties of industrial and thermal energy waters have been evaluated with the completeness necessary to select a basic scheme for their processing, ensuring rational and integrated use of waters and extraction of useful components.;

The conditions of water extraction and its impact on the environment, underground and surface water sources have been studied to a sufficient extent to substantiate the possibility and geological and economic feasibility of exploiting groundwater, as well as to determine the principal directions of environmental protection measures.

41. Reserves of category C2 are calculated based on the results of prospecting operations or by analogy with more studied fields, as well as in estimated or explored fields in addition to reserves of higher categories, in fields studied during prospecting, evaluation and exploration work. They are designed to assess the operational capabilities of groundwater deposits.

Category C2 stocks meet the following requirements:

calculated over the entire area of the groundwater deposit in relation to conditional generalized exploitation schemes according to their calculated productivity, as well as according to the groundwater balance or hydrogeological analogy;

the calculated flow rates of the wells are justified by the results of testing single exploration and mapping wells;

The conditions for the formation of reserves have been studied to the extent that they provide an assessment of the potential for water extraction within the field under study;

The quality of groundwater has been studied from single samples and meets the requirements of their intended purpose.;

The conditions of water extraction have been studied to the extent that it is possible to make an approximate geological and environmental assessment of the consequences of exploitation and the economic efficiency of groundwater use.

42. Forecasted resources of category P are the amount of groundwater of a certain quality and purpose, which is obtained within the boundaries of the estimated productive horizon, promising for further economic use, and characterizes the potential use of groundwater, including in relation to existing design or conditional schemes for the location of water consumers. They are the basis for setting up prospecting and exploration activities in areas promising for the identification of groundwater deposits, as well as for drawing up plans for the protection and use of water resources and integrated water resources management, water management balances.

The forecast resources are estimated based on the results of regional geological and hydrogeological, hydrological, water balance, hydrochemical and geophysical studies mainly based on general theoretical ideas about the conditions of their formation.

Paragraph 8. Grouping of groundwater deposits (sites) according to the complexity of hydrogeological conditions

43. Deposits of drinking and industrial waters are associated with aquifers that are widespread: within modern and buried river valleys; in artesian basins; in cones of outflow of foothill plumes and intermountain depressions; in limited structures or arrays of fractured and karst rocks and zones of tectonic disturbances; in sandy massifs of deserts and semi-deserts.

The complexity of the hydrogeological conditions of various types of groundwater deposits is determined by the nature of the occurrence and structure of aquifers, the variability of the capacity and filtration properties of the host rocks, the boundary conditions of aquifers, the peculiarities of the formation of operational groundwater reserves, hydrochemical conditions, as well as environmental features of development. According to the complexity of the hydrogeological conditions, deposits of three groups are distinguished.

Group I includes deposits with simple hydrogeological and hydrochemical conditions, with a calm occurrence of aquifers, consistent in thickness, structure and filtration properties of water-bearing rocks - deposits of artesian basins, cones of outflow of foothill plumes and intermountain depressions, as well as located in river valleys, provided that operational reserves are replenished due to surface waters, the forecasted quantitative damage to the environment caused by groundwater extraction.

Deposits belong to the II group:

with complex hydrogeological conditions due to insufficient capacity, structure, or filtration properties of the host rocks under simple hydrochemical conditions (in artesian basins, as well as fractured rocks associated with aquifers);

with complex hydrochemical conditions typical of many deposits in sandy desert massifs, semi-deserts and artesian basins.

The same group includes deposits in river valleys, in limited-area structures or arrays of fractured and fractured karst rocks, the operational reserves of which are periodically replenished by surface waters, as well as deposits with simple hydrogeological and hydrochemical conditions. The impact of groundwater extraction on the environment is insignificant and is estimated approximately based on the results of exploration work.

Deposits belong to the III group:

with very difficult hydrogeological conditions due to the high variability of the thickness and structure of aquifers and the filtration properties of the host rocks, deposits in the marginal parts of artesian basins of the platform type with implicit sources of formation of operational groundwater reserves;

with a limited distribution of aquifers – deposits of fractured-karst and fractured-vein waters that are not associated with surface waters;

with very difficult hydrochemical conditions;

This group includes deposits of drinking and industrial waters, the effective development of which is possible only with artificial recharge of water intakes or the use of complex water intake systems, and deposits for which the forecast of the effects of water withdrawal on the environment is based on an analysis of the general geoecological situation.

44. Mineral water deposits are associated with aquifers distributed in: artesian basins of platforms; in artesian basins of folded areas; in limited folded structures or arrays of igneous, metamorphic and sedimentary rocks and in zones of tectonic disturbances; in the weathering crust of igneous and metamorphic rocks and loose sedimentary (alluvial) deposits.

The complexity of the hydrogeological conditions of mineral water deposits in each specific case is determined by the nature of the occurrence, the structure of aquifers, the variability of the capacity and filtration properties of the host rocks, the peculiarities of the sources of formation of operational water reserves, hydrochemical and geothermal conditions.

According to the complexity of hydrogeological, hydrochemical and geothermal conditions, three groups of mineral water deposits are distinguished.

Deposits with simple hydrogeological, hydrochemical and geothermal conditions belong to group I: there are no sources of water quality changes or reliable forecasting is possible; the boundaries of substandard-quality waters are removed at a distance excluding their influence over the estimated life, or at a short distance, but have a simple configuration, and the aquifer is represented by homogeneous rocks, which allows provide a forecast of possible quality changes analytically; A quantitative forecast of damage to various components of the natural environment under the influence of groundwater extraction is possible. These are usually deposits of artesian basins of platforms and large deposits of artesian basins of folded areas.

Deposits with complex hydrogeological, hydrochemical or geothermal conditions belong to group II: the boundaries of zones with different groundwater quality have a complex configuration, there are prerequisites for the overflow of substandard groundwater from above and below aquifers; aquifers are heterogeneous in filtration properties; the forecast of quality changes can be performed by approximate calculation, sometimes with with the help of special experimental filtration works. The impact of groundwater extraction on the environment is insignificant and is estimated based on the results of exploration work. These are deposits in artesian basins of platforms and folded areas, as well as in loose sedimentary (alluvial) deposits.

Group III includes deposits with very complex hydrogeological conditions due to the high variability of the thickness and structure of aquifers and the filtration properties of the host rocks, or with very complex hydrochemical and geothermal conditions; the boundaries of zones with different water quality have a complex configuration in plan and section; temperature conditions are very heterogeneous; aquifers or zones are confined to uneven-fractured or karst rocks, there are ways of vertical overflows of groundwater from horizons with substandard water quality; The forecast of changes in water quality is approximate, and the impact of water extraction on the environment is based on the analysis of the general geoecological situation. These are deposits in limited-area folded structures or rock arrays, in zones of tectonic disturbances, in the crust of weathering of igneous and metamorphic rocks, as well as in loose sedimentary (alluvial) deposits with local distribution of mineral waters.

45. Deposits of industrial and thermal energy waters are associated with aquifers: in artesian basins of platforms; in artesian basins of folded areas; in arrays of fractured rocks of folded areas.

Industrial water deposits can be associated with aquifers of ancient and modern lake depressions. Currently, there are no developed deposits of fractured-vein type industrial waters.

The complexity of the hydrogeological conditions of industrial and thermal energy waters in each specific case is determined by the nature of the occurrence, the structure of aquifers, the variability of the capacity and filtration properties of the host rocks, especially the sources of formation of operational water reserves, hydrochemical, and for thermal energy waters and geothermal conditions.

According to the complexity of the hydrogeological conditions, three groups of deposits of industrial and thermal energy waters are distinguished.

Group I includes deposits with simple hydrogeological conditions, with a calm occurrence of aquifers, consistent in thickness, structure and filtration properties of the host rocks, with relatively simple hydrochemical and geothermal conditions for thermal energy waters. The impact of groundwater extraction on the environment will be practically non-existent. These include many deposits in the artesian basins of the platforms and the largest deposits in the artesian basins of folded areas with pore reservoirs.

The second group includes deposits with complex hydrogeological conditions due to the variability of the capacity, structure of aquifers and filtration properties of the host rocks, or with complex hydrochemical, and for thermal energy waters and geothermal conditions. The impact of groundwater extraction on the environment is insignificant and is estimated approximately based on the results of exploration work. Such deposits are found in artesian basins of both platforms and folded areas.

Deposits belong to the III group:

Industrial waters

with very difficult hydrogeological conditions due to the high variability of the thickness and structure of aquifers and the filtration properties of the host rocks; these include individual deposits in artesian basins of platforms and folded areas;

limited (focal) distribution, for example, of a crack-vein type in folded areas;

with very difficult hydrochemical conditions typical of deposits in lake depressions.

Thermal energy waters

with very complex hydrogeological, hydrochemical and geothermal conditions: thermal energy waters are associated with aquifers of very unevenly fractured or karst rocks, as well as with terrigenous rock complexes of complex structure and numerous tectonic disturbances; hydrochemical and geothermal fields are very heterogeneous, with complex boundary configurations. This group includes almost all fractured-vein deposits, the most complex deposits in the artesian basins of folded regions, and individual deposits with highly heterogeneous filtration properties of the water-bearing rocks of productive aquifers in the artesian basins of platforms.

Group III includes deposits of industrial and thermal energy waters, the forecast of the consequences of water extraction from which on the environment is difficult and is carried out on the basis of an analysis of the general geoecological situation.

If used (spent) or other waters are being pumped or planned to be pumped into aquifers under development at industrial and thermal power water deposits, the complexity group of the deposit (site) is established taking into account the reliability of the forecast of changes in water quality, temperature and other limited indicators.

46. The assignment of a deposit or site to a particular group requires justification in each specific case.

Paragraph 9. Grouping of operational groundwater reserves

47. According to the conditions of development, as well as economic and economic significance, operational groundwater reserves are divided into balance and off-balance reserves, which are subject to separate calculation and accounting.

The basis for allocating balance reserves for drinking, industrial, technical and mineral groundwater is the established need for water supply sources and waters for the purposes of balneology and therapeutic drinking, their quality compliance with standards and consumer requirements.

Off-balance sheet reserves are calculated and accounted for if the possibility of their subsequent involvement in operation is proven, including the possibility of maintaining their quantity and quality, as well as improving the technique and technology of extraction, processing and pre-treatment of water. When calculating off-balance sheet stocks, they are subdivided depending on the reasons for being classified as off-balance sheet.

Paragraph 10. Conditions for the use of operational groundwater reserves

48. Industrial development of groundwater deposits (sections) is allowed in reserves of category A or B, and in the cases provided for in paragraph 72 – in reserves of categories C1 and B+C1.

49. Groundwater deposits are transferred to subsurface use for further geological study or development in accordance with the procedure established by law, subject to a positive conclusion of the state geological expertise of the reserve calculation materials, the availability of permits and approvals from authorized government agencies.

50. Revaluation of operational reserves is carried out in the following cases::

transfer of reserves from one category to another based on exploration or exploitation data;

at the end of the estimated service life;

identification of additional natural, economic, or environmental factors during the exploration and development of deposits that significantly affect the industrial assessment of the deposit and violate licensing conditions, as well as changes in the water management, sanitary, and environmental conditions that existed at the time of reserves calculation.;

transfer of off-balance sheet stocks to balance sheets;

non-confirmation of reserves previously accepted by the state expertise of the subsoil;

if the water intake in the fields under development exceeds the total value of the approved reserves by more than 20 %;

revision of conditions, requirements of standards or technical conditions for the quality of groundwater, changes in the purpose of their use, as well as fundamental changes in the technology of extraction of useful components.

51. Groundwater deposits (sites) involved in industrial development are monitored to the extent that they clarify the balance components of operational reserves and forecast their changes.

Paragraph 11. Grouping of hydrocarbon reserves and resources

52. Reserves and resources of hydrocarbons and associated components are calculated (estimated) and accounted for in the state balance of minerals based on the results of geological exploration and field development. Data on reserves and resources of hydrocarbon deposits are used in the design of production, transportation and processing of hydrocarbon raw materials, planning of exploration work and calculation of taxes and other mandatory payments to the budget paid during their extraction.

53. When determining reserves, reserves of hydrocarbons and their components (ethane, propane, butane, sulfur, helium, metals) are subject to mandatory calculation and accounting, where the feasibility of extraction is justified by technological and technical and economic calculations. The calculation and accounting of hydrocarbon reserves and the components contained in them are carried out for each deposit separately and in the amount of the deposit, according to their presence in the subsurface, without taking into account losses during field development.;

54. Reserves and resources of hydrocarbons and associated components are subject to state expertise.

State expertise is carried out at any stage of the geological study of the territory and fields for an objective assessment of the quantity and quality of reserves and resources of oil, gas and condensate, their economic value, mining, hydrogeological and environmental conditions of their extraction.

In case of changes and (or) clarification of the geological structure of the field as a result of additional exploration work carried out at the field or in case of changes in the initial geological and (or) recoverable reserves of hydrocarbons of category "A+B+C1" according to the development data for large fields more than 10%, for the rest – more than 20%., the inventory is recalculated and its state expertise is carried out.

Reserves are recalculated and their state expertise is also carried out in the event of changes in the concept of the distribution of reserves in the productive context, affecting the production of reserves and the ongoing system of field development (deposits).

55. There are two groups in the geological reserves of the identified deposits and the resources of promising and forecast facilities: profitable (recoverable) and unprofitable.

Profitable (recoverable) reserves include reserves and resources, the extraction of which is economically feasible using modern proven technologies and techniques in compliance with the requirements for the protection of the subsoil and the environment. This part of the geological reserves and resources is determined by the hydrocarbon recovery coefficients.

Unprofitable (off-balance sheet) reserves include reserves and resources, the extraction of which is currently economically impractical.

56. The sum of recoverable reserves and resources at the valuation date is the current total amount of recoverable hydrocarbons. Together with the extracted hydrocarbons, it makes up the initial total amount of recoverable hydrocarbons.

Paragraph 12. Classification of hydrocarbon reserves and resources

57. Reserves of hydrocarbons and associated components are divided into proven categories and pre–estimated (undiscovered) category C2 according to the degree of study.

Proven reserves include developed (categories A and B) and explored (category C1) reserves.

Category A – reserves of a developed reservoir (part of it), studied in detail, providing, along with a complete description of the reservoir structure, reservoir parameters and fluids saturating them, parameters reflecting reservoir productivity and justification of oil, gas and condensate recovery coefficients, the possibility of a differentiated assessment of reserves by parameters determining the production of reserves within individual reservoir layers. and development elements.

Category A reserves are calculated based on the deposit (part of it) drilled in accordance with the approved field development project or additions to it and serve as the basis for optimizing the system and the process of developing hydrocarbon reserves.

The boundary of category A reserves is drawn in the middle between wells with reserves of category A and category B along a circle, the radius of which is equal to half the distance between the production wells of the deposit. Category A is used for deposits where production is more than 80%.

Category B – reserves of a developed deposit (part of it), studied in detail, which allows, along with reliable characteristics of the deposit structure, reservoir parameters and fluids saturating them, parameters reflecting reservoir productivity and justification of hydrocarbon recovery coefficients, to assess the structure of reserves by the main parameters affecting their production.

Category B reserves are calculated based on the deposit (part of it) drilled in accordance with the approved Field Development Project or an addendum to the Development Project and serve as the basis for optimizing the field development system (deposits and/or parts thereof).

The boundary of category B reserves is drawn in the middle between wells with reserves of category B and other categories or along a circle, the radius of which is equal to half the distance between the production wells of the deposit.

Category C1 – reserves of a deposit (part of it), the oil and gas content of which is established on the basis of hydrocarbon inflows obtained in wells and positive results of geological and geophysical studies. The type, shape, and size of the deposit, as well as the conditions of occurrence of reservoir formations containing oil and gas, were determined based on the results of drilling wells and methods of geological and geophysical research proven for the area.

Reserves of category C1 are calculated based on the results of geological exploration and well drilling and are studied to the extent necessary to obtain initial data for the preparation of a Project for the development of a hydrocarbon field.

Reserves of category C1 are allocated in a new area based on drilling and testing of single wells, provided that they receive inflows of hydrocarbons, confirmed by the well test report.

In the case of confirmation of the presence of hydrocarbons according to the data of testing by reservoir testers in an open borehole, category C1 is assigned in the area of the reservoir (productive horizon) tested by the reservoir tester if there is a confirmed act of receiving an influx of hydrocarbons during testing of wells (wells) drilled within the same structure and having similar geological and geophysical characteristics.

The boundaries of the C1 reserves calculation site at the exploration (assessment) stage are carried out in a radius equal to twice the distance of the well drainage zone established experimentally.

The boundaries of the C1 reserves calculation site at the production stage, with the approved Design Document for development, are carried out in a radius equal to twice the distance between the production wells.

For deposits of the II and III orders, the boundaries of the C1 category site at the production stage, if there is insufficient geological, geophysical and (or) field study, are drawn along a radius equal to the distance between the production wells.

Category C2 – reserves of a deposit (its parts) where the presence of hydrocarbons is justified by geological and geophysical research data.

The shape and size of the deposit, the conditions of occurrence, the thickness and reservoir properties of the formations, and the properties of hydrocarbons are determined in general terms based on the results of geological and geophysical studies, taking into account data on the studied part of the deposit in detail or by analogy with the explored deposits.

Reserves of category C2 are used to determine the prospects of a field, plan geological exploration or geological field research when transferring wells to overlying formations.

Reserves of category C2 are used in the design of exploration projects for the purpose of evaluation and projects of trial exploitation of deposits (carried out if appropriate).

58. Hydrocarbon resources are divided into prospective categories C3 and forecast categories D0, D1 and D2 according to the degree of their validity and appropriateness.

Category C3 – promising resources of areas prepared for exploratory drilling.

The shape, size and conditions of occurrence of the deposit are determined in general terms based on the results of geological and geophysical studies, and the thickness and reservoir properties of the formations, the composition and properties of oil or gas are assumed by analogy with the explored deposits.

The resources of category C3 are calculated in areas prepared for deep drilling, located within the oil and gas region and contoured by geological and geophysical research methods proven for the area, and in formations of explored fields that have not been uncovered by drilling, if their productivity is established in other fields of the area.

Prospective resources are used in the planning of exploration activities (exploratory stage).

Category D0 – forecast resources of identified local objects (localized).

The shape, size and conditions of occurrence of the proposed deposit are determined in general terms based on the results of geophysical (geological) studies, and the thickness and reservoir properties of the formations, composition and properties of hydrocarbons are assumed by analogy with the explored deposits.

Category D1 – forecast resources of lithological and stratigraphic complexes estimated within large regional structures with proven industrial oil and gas potential.

The quantitative assessment of the projected resources of category D1 is carried out according to the parameters adopted based on the results of regional geological and geophysical studies and by analogy with the explored deposits within the assessed region.

Category D2 – predictive resources of lithological and stratigraphic complexes estimated within large regional structures where industrial oil and gas potential has not yet been proven. The prospects for the oil and gas potential of these complexes are predicted based on data from geological, geophysical and geochemical studies.

The quantitative assessment of the projected resources of category D2 is based on estimated parameters based on general geological concepts and by analogy with other studied regions where there are explored oil and gas fields.

59. According to the complexity of the structure, deposits are distinguished:

Order I (simple structure) – associated with undisturbed or slightly intact structures; productive strata are characterized by consistent thicknesses and reservoir properties in area and section;

II (complex structure) – characterized by incontinence of thickness and reservoir properties of productive strata in area and section, or the presence of tectonic disturbances;

Order III (very complex structure) – characterized by the presence of tectonic disturbances, as well as the lack of thickness, reservoir properties of productive strata and the presence of complex reservoir types.

60. Large hydrocarbon deposits are recognized that meet the requirements established by the second part of paragraph 3 of Article 14 of the Code.

According to the size of the initial recoverable reserves, traditional deposits are divided into: unique, large, medium, small and very small in accordance with the appendix to this Instruction "Classification of deposits by the size of recoverable reserves".

61. Paragraph 60 of this Instruction does not apply to unconventional hydrocarbon deposits.

62. The size of reserves and the complexity of the geological structure of the deposit determine the methodology of exploration, their volume, economic indicators of exploration and development.

63. According to the degree of development, deposits (deposits) are divided into developed, prepared for development, explored and conserved, reserves for them are separately accounted for by the state balance sheet.

64. A deposit with proven recoverable reserves is transferred to a subsurface user for industrial development subject to the following conditions:

The state expertise of reserves and feasibility studies of oil, gas and condensate recovery coefficients has been carried out, and the field (or part of it) has been recognized by the state expertise as prepared for industrial development.;

The degree of impact of the field development on the environment and the effectiveness of planned environmental protection measures are assessed.;

The degree of exploration of the deposit by industrial categories (A+B+C1) is more than 50%.

65. The third paragraph of paragraph sixty-four of the Instruction does not apply to unconventional hydrocarbon deposits.

The design of a project for the development of unconventional hydrocarbons for reserves assessed according to category C1 is carried out with the obligatory condition of their detailed study by modern methods of geological and geophysical research, and confirmed by the results of well testing.

66. With respect to gas and gas condensate fields, calculation of reserves with a feasibility study of gas (condensate) recovery coefficients without making an Operational calculation and a Trial operation project in the case of:

The study by the subsurface user of the structural and tectonic model of the deposit, where the type, shape and size of the deposit, and the conditions of occurrence of reservoir formations containing gas and condensate are established based on the results of drilling and testing wells and methods of geological and geophysical research proven for the area.;

The lithological composition, reservoir type, reservoir properties, and gas-saturated thickness of productive formations were studied from the core and materials of geophysical studies of wells;

The composition and properties of hydrocarbons in reservoir and standard conditions have been studied based on well testing data.;

The condensate-gas factor has been determined at the stage of the Exploration Project implementation.

The data obtained is sufficient to justify the calculation of reserves with its approval in accordance with the established procedure and for the design of the development.

The estimated geological reserves in the above-mentioned case by industrial categories (A+B+C1) amount to at least 50%.

67. In the fields put into development, reserves are sequentially transferred from category C2 to category C1, and then to category B according to drilling and well research data.

Appendix to the Instructions for classifying reserves of deposits and forecast resources of useful minerals, including those related to unconventional hydrocarbons

Classification of deposits by the amount of recoverable reserves

Download

Classes of deposits according to the size of recoverable reserves

Oil+condensate(million tons)

Gas(billion m3)

Unique

more than 50

Large ones

30,1-50

Medium

10,1-30

Small ones

1,1-10

Very small

up to 1

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