Controlling Factors and Forming Types of Deep Shale Gas Enrichment in Sichuan Basin, China

In order to find out the enrichment mechanism and forming type of deep shale gas, taking Longmaxi Formation in Desheng–Yunjin Syncline area Sichuan Basin as an example, we determined mineralogy, organic geochemistry, physical property analysis, gas water content, influence three factors, namely sedimentation, structural conditions, hydrogeological on gas. The results show that is a good hydrocarbon source rock over-mature stage has characteristics high porosity, low permeability, high-water saturation. contents clay quartz are high, brittleness index quite different. According mineral composition, nine types lithofacies can be found. development sealing roof have no obvious but tectonic activities hydrodynamic conditions main control factors for different regions accumulation study divided into types: fault-controlled anticline-controlled hydrodynamic-controlled distributed north Desheng syncline Yunjin syncline, south middle Baozang syncline. This result great significance exploration.