Study progress on pore-crack heterogeneity and geological influence factors of coal reservoir

The pore-crack of the coal reservoir was an important space of the coalbed methane adsorption,migration and enrichment and the heterogeneity would hav e important significances to the coalbed methane exploration zone selected and the rational development. From the coal reservoir pore-crack classification method,quantita tive characterization technology,heterogeneity distribution law,geological control factor and other aspects,the paper analyzed and summarized the new progress of the coal reservoir pore-crack heterogeneity and geological control study at home and abroad. The study results showed that the pore-crack classification plan would have diversity,b ut mainly based on the dimension and mechanism classification,a dimension and mechanism combined classification method deepened the understanding of the coalbed m ethane storage and migration.The pore-crack heterogeneity characterization technology would have refined,quantitative and ultra-micro features,and would be an important development tendency of the coal reservoir pore-crack study method in the world in combination with other subject comprehensive analysis.The coal reservoir pore-crack h eterogeneity was mainly controlled by the coal metamorphism role, sedimentary environment,tectonic evolution,magmatic activity and other mutual superposition role. The s ynthesized multi normal and abnormal characterization technologies were applied to the systematic,refined and ultra micro quantitative characterization on the coal reservo ir pore- crack heterogeneity. The geological formation law of the coal reservoir pore- crack heterogeneity was searched and would be a development tendency of the late st udy area.