Research on the Pore Structure Characteristics of the Main Coal Seam in the North Flank of the Agong'Synclinal Coal Reservoir in Qianxi
In order to study the pore structure characteristics of the Agong'synclinal coal reservoir of the Zhijin-Nayong Coalfield in Qianxi to guide the development of coal-bed methane and the extraction of coal mine gas in this area,relevant tests such as mercury intrusion and coal rock identification have been carried out on coal samples from the main coal seam of Well DJT1,a coal-bed methane parameter well,constructed in the research area,the change laws of the porosity characteristics and pore characterization parameters in the coal seam have been analyzed in combination with test data,and the geologic control factors of the porosity characteristics in this area have been explored.The results show that the pore morphology is dominated by open pores,with a certain number of semi-closed pores,that the total pore volume ranges from 0.022 5 to 0.03 31 mL/g,with the highest proportion of small pores,followed by micropores,that the porosity and pore volume decrease with the increase of the degree of coal metamorphism,and that the content of the maceral vitrinite of coal petrography generally exceeds 55%,which controls the content of micropores and small pores,while the increase of mineral content generally has a negative impact on the development of pores.
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