Research on pore structure characteristics of gas coal in Fukang mining area

In order to study gas storage and extraction feasibility in Fukang mining area, mercury intrusion method and liquid nitrogen adsorption method in low temperature were used to compare and analyze pore structure parameters and distribution characteristics of coal under different conditions.The analysis results show that large pores and micropores in coal samples account for a large proportion, the pores with large pore diameter are composed of cylindrical pores with open ends and parallel plate holes with four open sides, which has good openness and is beneficial to gas drainage and utilization;The total pore volume of gas coal samples is larger than that of high metamorphism coal samples, pore structure is conducive to the occurrence and release of gas; The specific surface area of gas coal pores is smaller than that of high metamorphic coal samples, but the specific surface area of small pores account for a large proportion in the pore structure, and small holes can provide large space for gas adsorption, so the gas coal in Fukang mining area also has certain gas adsorption capacity, coal seam gas can be extracted and utilized.