摘要
川东地区沉积盖层中，顺层滑脱构造十分发育，经地震剖面和露头地质研究，可划分为４套层滑系统。其中下寒武统、上奥陶下志留统、上二叠统和中下三叠统等是这些层滑系统的４套主要的滑脱层。滑脱层主要由泥页岩、膏盐岩或煤层构成，在岩石力学性质上，具有抗压强度低、弹性模量小、内磨擦角小以及泊松比大等特点；在物性参数上，其密度、孔隙度、磁化率、视电阻率以及声波速度都较低。露头中的动力变质、塑性变形和平衡剖面的正演计算恢复均证实了层滑系统的存在。结合油气地质研究发现：滑脱层系大多是极具潜力的烃源层和良好的区域盖层。另外，滑脱层系还构成该区上下两个封存箱的区域平板状封隔层。
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.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
1998年第3期244-247,共4页
Oil & Gas Geology
