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Characterization of the microscopic pore structure of the lower paleozoic shale gas reservoir in the Southern Sichuan Basin and its influence on gas content

ABSTRACT The results show that multiple genetic types of pores occur in the Lower Paleozoic shales, including inter-granular pores, intra-granular pores, and organic matter pores. Micropores provide the primary storage space for shale gas in the southern Sichuan basin. The characteristics of microscopic pores and pore structures directly affect the gas content of shales. Differences in the pore structure characteristics of the Lower Paleozoic shales provide a basis for understanding differences in gas content between the Longmaxi Formation and the Qiongzhusi Formation, two shale gas reservoirs in the Sichuan Basin.