Study On Depositional System Feature And The Pattern Of Oil And Gas Accumulation Of The NO.4 Member Of Shahejie Formation From Xinzhen To The West Of Guangli In Dongying Depression

Based on the extensive document consulting and absorbed the study and exploration achievement on the survey region of the Dongxin Oil Field,a comprehensive analysis was given to the seismic data,core logging data,and core analysis data of this area.Under the guidance of the new theory,technology and method of the sequence stratigraphic theory,sedimentology,geophysics,petroleum geology and geochemistry,the Es4 member was devided into two long-term cycles,the upper member of Es4 and the lower member of Es4,two medium-term cycles,the Chunshang member of Es4 and the Chunxia member of Es4,and eight short-term cycles,Cs1-Cs6,Cx1,Cx2.The faults developed a lot in Es4 of the study area.The faults were devided into three tectonic units on plane,the Guangli antiline in the middle which was complicated by the NE-SW direction faults,the slope zone in the west which was incised by the EW direction faults,the Qingnan syncline in the east which was complicated by the surrounding faults.Based on the research of sediment provenance and the sedimentary rule,the survey region developed delta and beach bar faces under the control of the south provenance in the Cx2-Cs6 sand groups.Cs4 and Cs5 sand groups are the important phase when the south provenance was being replacing by the north provenance and meandering river delta and turbidite fan groove in the shallow water.The oil-gas reservoir model contains three kinds,lithologic,structural and structural- lithologic reservoirs.On the basis of the research on the pattern of oil and gas accumulation,aiming at the Chunshang 5th and Chunshang 6th sand groups,four favorable targets were pointed,Yingxie 94 well area,Lai 110 well area,Lai 31 well area,Lai 64 well area.