Study on the characterization of pore structure and main controlling factors of pore development in gas shale

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

“…There is a positive relationship between PV and SSA (R 2 = 0.6704) in Shanxi Formation shale samples (Figure 9(a)). The SSA increased with the increase of the PV, which is consistent with previous results (Iqbal et al, 2021;Xu et al, 2020). However, the PV and SSA have insignificant negative correlation with the average pore size (Figure 9(b) and (c)), indicating that PV and SSA may increase with the decreasing of pore size, that is, the smaller the average pore size, the larger the PV and SSA will be.…”

“…Previous studies have shown that the pore structure of coal measure shale is affected by many factors. In China, studies on coal measure shales of Taiyuan Formation in Huainan coalfield, Shanxi Formation, and Taiyuan Formation in Qinshui Basin have found that organic matter can promote the development of nanoscale pores (Chen et al, 2020; Ge et al, 2020; Pan et al, 2017), significantly promoted the pore development of <50 nm, followed by the content of clay minerals, while quartz inhibited the pore development (Yan et al, 2017; Yuan et al, 2021). However, Zhang et al (2017) studied the pore structure of coal measure shales of Yan’an Formation and Taiyuan Formation in the northeastern margin of the Ordos Basin and found that organic matter and clay content had a poor correlation with total surface area and porosity, and believed that single factor had no significant influence on pore structure (Zhang et al, 2017).…”

Lower Cambrian Organic-Rich Shales in Southern China: A Review of Gas-Bearing Property, Pore Structure, and Their Controlling Factors

“…In the whole Yangtze region, the Lower Cambrian shales have high maturity, with the EqVRo value ranging from 2.5% to 6.0% [30,33,56,[74][75][76][77][78]. The EqVRo value of the Lower Cambrian shales in the Upper-Middle Yangtze region mainly varies from 3.0% to 4.0%.…”

Effects of gas components, reservoir property and pore structure of shale gas reservoir on the competitive adsorption behavior of CO2 and CH4

“…The influence of clay minerals J o u r n a l P r e -p r o o f on shale pore structure parameters and adsorption capacity is complex, and researchers have reported diverse results on different shale gas reservoirs. Ma et al [81] stated that clay minerals have a significant contribution to pore structure parameters, which is reflected in a significant linear positive correlation, whereas the results of Xu et al [82] exhibited a negative linear correlation, which is not conducive to the development of pore structure parameters. Additionally, Guo et al [80] stated that the effect of clay content on pore structure parameters of shale is weak.…”