摘要：In order to further evaluate the geological sweet spot area of shale gas in complex tectonic area, and realize the exploration breakthrough of shale gas in China. By means of field survey, nu-merical simulation and scanning electron micro-scope analysis, the shale lithofacies distribution and tectonic control are further studied. In which, Longmaxi formation in Sichuan Basin is taken as an example. Taking the two-step method of"TOC + mineral composition"as the basis of lithofacies division, the lithofacies distribution characteristics in lateral, longitudinal and plane of Longvi sub-member are described. The results show that the carbon content gradually decreases longitudinally, from high carbon siliceous shale to low carbon clay shale due to the influence of sedimentary environ-ment. The types of lateral and plane lithofacies vary greatly. The overall development degree of sedi-mentary rocks is in the hinterland of the basin, which is better than that near the denudation line of paleo-uplift. In the study of tectonic basin control, the influence of crustal uplift, fold and fault on shale gas reservoir and micro-fracture development is emphatically analyzed. After uplifting, the crust is easy to be weathered and eroded, the cover be-comes shallower and thinner, and the hydrocarbon sealing capacity decreases. Through the results of core observation, data statistics and stress analysis, the influence of folds and faults on the opening degree, development direction and areal density of micro-fractures is explicated, which lays a good foundation for evaluating the exploration and de-velopment potential of shale gas in Longmaxi for-mation.
