Abstract:

The depositional covers in the eastern Sichuan region could be classified into four layer gliding systems according to the differences in rock features,rock mechanic parameters,rock physical parameters and seismic reflective characterisitics.The Lower Cambriam,Upper Ordovician Lower Silurian,Upper Permian and Middle Lower Triassic Systems in the studied area are the major gliding systems.These systems are composed of mudstone,shales,gypsum and coal-beds,and characterized by low appearent resistivity competent,lower physical parameters,strong seismic reflective,lower appearant resistivity.The mechanical metamorphic and the rheologic deformation of the outcrops and computer restored balanced cross-profiles proved the existanc of the gliding systems.Combining it with petroleum geology,it is found that almost all glided layers are hydrocarbon source rocks and regional caprocks of gas and oil reserviors.