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GB/T 46874-2025Assessment of CO2 storage capacity in offshore saline aquifers (English PDF)

海上咸水层二氧化碳封存量评价

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

December 31, 2025

Implementation date

July 1, 2026

Scope

GB/T 46874-2025 is the English-translated version of 海上咸水层二氧化碳封存量评价.

GB/T 46874-2025 is the Chinese standard "Assessment of CO2 storage capacity in offshore saline aquifers". Its scope clause reads: This document specifies the evaluation criteria, evaluation methods, and site type classification for site-level marine saline water carbon dioxide (CO2) sequestration.

This document applies to the evaluation and classification of carbon dioxide sequestration capacity in marine clastic rock saline aquifers. Its clauses include terms and definitions.

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Document preview — GB/T 46874-2025

National Standard of the People's Republic of China

ICS: 27.010
Classification: F 29

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
1.Scope
2 Normative References
3.Terms and Definitions
4.Evaluation conditions for the storage capacity of marine saline aquifers
5.Evaluation Methods for the Storage Capacity of Marine Saltwater Layers
6.Classification of marine saline water layer sites
Appendix A (Informative) Carbon Dioxide Density under Geological Conditions

1 Scope

This document specifies the evaluation criteria, evaluation methods, and site type classification for site-level marine saline water carbon dioxide (CO2) sequestration.

This document applies to the evaluation and classification of carbon dioxide sequestration capacity in marine clastic rock saline aquifers.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 15218 Classification and Grading of Groundwater Resources Reserves

DZ/T 0217 Standard for Estimating Oil and Gas Reserves

3 Terms and Definitions

The following terms and definitions apply to this document.

3.1

Rock pores or fissures located underground in the sea area, which are occupied by formation water with a mineralization degree >=3g/L.

3.2

Sites covering marine saline water layers can prevent fluids from leaking upwards into other saline water layers or into the low-permeability seabed.

The permeable rock strata, typically buried at a depth greater than 800m, contain saline reservoirs that meet the supercritical temperature and pressure conditions for carbon dioxide.

3.3

All saline water reservoirs located below the caprock in offshore saline water areas and buried at a depth less than a certain depth (e.g., currently 3500m) can be sealed.

The mass of carbon dioxide.

3.4

Located below the caprock in the marine saline layer region, the appropriate amount of carbon dioxide that can be sequestered within the saline layer.

3.5

The mass of carbon dioxide that a preferred saline reservoir can store, located beneath the caprock in a marine saline aquifer region.

3.6

Used to evaluate the capacity of carbon dioxide technical sequestration at offshore saline aquifer storage sites.

3.7

The amount of carbon dioxide technically stored per unit area at offshore saline aquifer storage sites.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 11 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 15218Classification for reserves of groundwater resources

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