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The pool-forming mechanism of coalbed methane has its own characteristics.In this paper, based on studies on the typical coal-bearing basins in China,it is pointed out that the reservoir formation of medium- to high-rank coalbed methane has experienced three critical stages:the coalbed methane generation and adsorption stage,the coalbed adsorption capacity enhancement stage,and the coalbed methane desorption-diffusion and preservation stage.The regional tectonic evolution, hydrodynamic conditions and sealing conditions play important roles in the stage of coalbed methane desorption-diffusion and preservation.Medium- to high-rank coalbed methane has three types of enrichment models,that is,the most favorable,the relatively favorable,and the unfavorable enrichment models.
The pool-forming mechanism of coalbed methane has its own characteristics. In this paper, based on studies on the typical coal-bearing basins in China, it is pointed out that the reservoir formation of medium- to high-rank coalbed methane has experienced three critical stages: the coalbed methane capacity generation stage, and the coalbed methane desorption-diffusion and preservation stage. regional tectonic evolution, hydrodynamic conditions and sealing conditions play important roles in the stage of coalbed methane desorption- diffusion and preservation. Medium-to-high coalbed methane has three types of enrichment models, that is, the most favorable, the relatively favorable, and the unfavorable enrichment models.