Pore structure characteristics of shale in coal-bearing strata: In the case of the Shanxi formation of lower Permian in Huainan coalfield in China

Reservoir pore characteristics are an important part of shale gas reservoir capacity evaluation. Compared with Marine shale, the study coal measure is relatively backward in China. In order to deeply analyze properties and give priority favorable reservoirs, structure measures from Shanxi Formation Lower Permian Huainan Coalfield China were investigated this study. The size distribution, specific surface area (SSA), volume (PV) obtained. BET PVs inconsistent variability total organic content (TOC) composition samples. There unobvious negative correlations between PV, SSA, TOC for samples However, contribution clay minerals PV SSA seems be positive, especially mixed-layer illite smectite.