大庆石油地质与开发2026，Vol.45Issue(1)：155-165,11.DOI:10.19597/J.ISSN.1000-3754.202410036
深部煤储层吸附气与游离气赋存的温压作用
Temperature and pressure effect on occurrence of adsorbed gas and free gas in deep coal reservoirs
摘要
Abstract
In order to accurately characterize the content of adsorbed gas and free gas in deep coal reservoirs in com-plex temperature and pressure conditions,a model for predicting local methane density distribution in micro-nano pores and adsorbed gas content at the core scale is constructed based on the principle of global molecular chemical potential equilibrium under synergistic influence of wall-molecule interaction and inter-molecular interaction.The results show that increasing reservoir pressure enhances the gas content in micropores,with average methane densi-ty increased by 202 mol/(m³·MPa)in 1.5 nm diameter pores,while the temperature increase leads to an average methane density decrease of 33 mol/(m³·K).In conditions of temperature and pressure in deep coal reservoir(353 K,15～30 MPa),the proportion of free gas increases to 13%～23%with the increase of reservoir pressure.Small pores(pore diameter of 1.5 nm)exhibit stronger adsorption capacity compared to larger pores(pore diameter of 3 nm),with the absolute adsorbed gas in small pores 7.7%higher than that in larger pores at temperature of 353 K and pressure of 20 MPa.The research provides reference for geological reserves calibration and development plan design for deep coalbed methane.关键词
深部煤层气/吸附气/游离气/微孔/温压作用/化学势Key words
deep coalbed gas/adsorbed gas/free gas/micropore/thermo-pressure effect/chemical potential分类
能源科技引用本文复制引用
季亮,吴克柳,赵诚铭,聂志宏,孙政,王渊,杨宏涛,王得志,刘琦,张正朝,石军太..深部煤储层吸附气与游离气赋存的温压作用[J].大庆石油地质与开发,2026,45(1):155-165,11.基金项目
国家自然科学基金项目"煤基质孔隙内压裂液入侵与返排的气水相互作用机理研究"(52104099) （52104099）
中国石油天然气股份有限公司煤层气有限责任公司科技项目"韩城区块气藏精细描述研究技术服务项目"(HC23146DZ07). （HC23146DZ07）
