Characteristics of Pore Structure and Gas Content of the Lower Paleozoic Shale from the Upper Yangtze Plate, South China

This study is predominantly about the differences in shale pore structure and controlling factors of gas content between Lower Silurian Cambrian from upper Yangtze plate, which are great significance to occurrence mechanism gas. The field emission scanning electron microscopy combined with Particles (Pores) Cracks Analysis System software, CO2/N2 adsorption high-pressure mercury injection porosimetry, methane were used investigate characteristics overall organic matter pore, heterogeneity Paleozoic southern Sichuan Basin northern Guizhou province plate. Results show that porosity development pores better than Cambrian, there four main types including interparticle intraparticle micro-fracture. micropores provide major volume specific surface areas. In shale, mesopores besides micropores. Fractal dimensions representing complexity gradually increase There a significant positive linear relationship total carbon areas correlation more obvious Cambrian. plane increases when it less 5%. positively correlated clay minerals negatively brittle content. 1.51–3.86 m3/t (average, 2.31 m3/t) 0.35–2.38 1.36 m3/t). Total carbon, for Probability entropy higher those but form factor roundness smaller.