Factors Influencing the Pore Structure and Gas-Bearing Characteristics of Shales: Insights from the Longmaxi Formation, Southern Sichuan Basin and Northern Yunnan-Guizhou Depression, China

China hosts rich shale gas resources. The Longmaxi Formation (LF) in the Sichuan Basin is one of important regions for exploration and extraction. Here, we investigate pore structure factors influencing gas-bearing characteristics pores reservoirs LF. We employed scanning electron microscopy (SEM), X-ray diffraction analysis (XRD), content testing, saturation testing based on nuclear magnetic resonance (NMR), overburden porosity permeability analysis, distribution size, specific surface area (SSA) geochemical analysis. Our results show that organic matter LF study highly favorable to conditions; brittleness regional generally increases with an increase depth. mainly include matter-hosted pores, intergranular intragranular microfissures, mesopores dominating. Meanwhile, also affected by mineral components, development pores. SSA are positively correlated total carbon (TOC), whereas clay minerals have adverse effect area. Higher TOC vitrinite reflectance (Ro) indicate higher content. It can be inferred as brittle increases, particles break form storage spaces depth causing increase. volume adsorbed gas. bound water rocks tends reduce desorbed suggest high potential extraction this region.