Crustal structure in the Dangyang Synclinorium shale gas field and its tectonic implications

In this paper, the crustal thickness, V-p/V-s ratio and S-wave velocity beneath 21 temporary seismic stations deployed in the Dangyang Synclinorium of the Yangtze Craton were obtained using the H-kappa stacking method of receiver function and joint inversion of multifrequency receiver function and surface wave dispersion. An average crustal thickness of 33.8 km and average V-p/V-s ratio of 1.75 were obtained in the Dangyang Synclinorium, suggesting that it has experienced thinning of the lower crust, but the body of crust still maintains typical cratonic structure. 1 similar to 2 km-thick low-velocity layer at depths of 3 similar to 4 km was imaged beneath most stations, which may be related to the enrichment of shale gas strata with high porosity and low density within the depth range. Our study suggests that passive source data from dense temporary seismic stations can provide valuable references for oil-gas exploration.