Coal facies characteristics and pore structure response of oil-rich coal in Yushenfu Mining Area

To study the influence of coal-forming environment on the pore structure of coal samples, we take the oil-rich coals from Ningtiaota and Zhangjiamao coal mines in Yushenfu Mining Area as the research object, carry out quantitative analysis of microcoal composition and coal facies, and determine the pore size distribution and pore structure characteristics of the oil-rich coal in this area by mercury intrusion method. Finally, the response mechanism of coal facies to coal pore structure is revealed. The results of the study found that: Shenmu oil-rich coal swamps are dominated by wetland herbaceous swamp facies and dry forest swamp facies, with weak hydrodynamic capacity; based on the comparison of the pore structure of Ningtiaota and Zhangjiamao oil-rich coals, the small, medium, and macropores in Ningtiaota 2-2 coal are more balanced, Zhangjiamao 4-2 coal has better small and mesopores and the development of macropores is relatively poor; for the oil-rich coal in the Yushenfu Mining Area, under similar coal rank conditions, its TPI coal facies characteristics mainly control the development of macropores, and indirectly affect the late-stage low-temperature pyrolysis efficiency of coal reservoirs.