Coupling between Source Rock and Reservoir of Shale Gas in Wufeng-Longmaxi Formation in Sichuan Basin, South China

In order to analyze the main factors controlling shale gas accumulation and predict potential zone for exploration, heterogeneous characteristics of source rock reservoir Wufeng-Longmaxi Formation in Sichuan Basin were discussed detail, based on data petrology, sedimentology, physical properties content. On this basis, effect coupling between generation reservation has been analyzed. The black divided into 5 types lithofacies, i.e., carbonaceous siliceous shale, argillaceous composite silty 4 sedimentary microfacies, deep shelf, shallow shelf. total organic carbon (TOC) content ranged from 0.5% 6.0% (mean 2.54%), which gradually decreased vertically bottom top was controlled by oxygen water. Most matter sapropel a high-over thermal maturity. characterized low porosity permeability. Pore mainly <10 nm pores, especially lower member Longmaxi Formation. size pores increased sharply upper volumes methane adsorption 1.431 m3/t 3.719 m3/t, contents 0.44 5.19 both upwards. Shale with high TOC siliceous/argillaceous shelf is considered have significant hydrocarbon storage capacity preservation, providing favorable conditions gas.