| Citation: |
FAN Liyong，ZHOU Guoxiao，YANG Zhaobiao，et al. Geological control of differential enrichment of deep coalbed methane in the Ordos Basin[J]. Coal Science and Technology，2025，53（1）：203−215. DOI: 10.12438/cst.2024-1144
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The deep coalbed methane (CBM) resources in the Ordos Basin are abundant and have great development potential, making it the main battlefield for exploration and development of deep CBM in China. Among them, clarifying the enrichment law of deep CBM and delineating enrichment sections are important foundation for CBM exploration and development. Based on the analysis of data from a number of deep evaluation CBM wells recentlyimplemented by China petroleum Changqing Oilfield company in Ordos Basin, the geological control factors and enrichment rules of deep coalbed methane differential enrichment in the basin are studied by means of mathematical statistics, model calculation and geological analysis. It has been proposed that the effects of material composition, depth, and preservation are the "three controlling effects" that affect the differential enrichment of deep CBM.The material component is the main factor controlling the enrichment of CBM, among which ash yield and coal metamorphism degree are the main parameters, low ash content, high metamorphic coal with high gas content. The depth effect is a comprehensive effect of superimposed porosity, temperature, and pressure. The porosity decays with the increase of burial depth, resulting in the free gas will tend to slow down with the increase of burial depth, and the adsorbed gas exists obvious critical conversion depth, and the critical conversion depth of total CBM content is deeper than the critical conversion depth of adsorbed CBM, which is generally in the range of
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