Fault Development Characteristics of Cenozoic and Its Controlling Effect on Hydrocarbon Accumulations in Shanan Sag
In order to clarify the features of Cenozoic fault activity and its control on hydrocarbon enrichment in Shanan Sag,the geometric and kinematic characteristics of the main faults in the study area were studied by using high-precision 3D seismic data and drilling data.In addition,discussions were also conducted on the control of fault development on source rocks,reservoirs,traps and hydrocarbon migration.The results show that the faults in the study area can be divided into three levels horizontally and two systems vertically,and the deposition period of Kongdian Formation to the third member of the Shahejie Formation and the deposition period of the Dongying Formation are the peak periods of fault activity.Excellent source rocks are often found in the footwall area of high activity rate synsedimentary faults,and various sand body development modes are controlled by different types of fault boundaries on the north side of the sag.The formation of structural and lithologic traps are controlled by faults,and both faults and sand bodies are the main hydrocarbon migration pathways in the study area.There are three types of fault-controlled accumulation modes:near-source accumulation with"fault-controlled"double pathways on the north and south sides of the central uplift area in the sag,remote-source accumulation with"fault-sand body coupling"ladder-shaped mesh work-carpet conduction in the steep slope on the north side of the sag,interior-source accumulation with"fault controlled"front sand body in the lower part of the sag slope.Deep lithologic traps in the north of the sag and structural traps in the middle and shallow part of the steep slope zone in the north of the sag are favorable exploration targets in the future.
fault systemfault characteristicsfault controlling reservoirCenozoicShanan Sag
万方数据
维普
