Study on the conditions and controlling factors of petroleum accumulation in Shahejie Formation of Zhangdong area of Qikou Depression

Petroleum exploration of Zhangdong area started relatively late, and basic geological studies suggested that the conditions of petroleum accumulation of Zhangdong area were superior. There are three petroleum migration transportation systems including sand-stone translocation layers, faults and unconformities. Cross-cutting, overriding, connecting of above mentioned 3 transportation systems in different structural locations in the study area has constituted a complex transportation system, and then control the petroleum accu-mulation and the distribution of reservoir. Different sedimentary facies control the reservoir properties directly and have a decisive role on petroleum accumulation and productivity.