3D Seismic Data Fine Interpretation And Trap Evaluation In The Northern Of Wangji Oilfield

The north of Wangji Oilfield is located in Dahetun Township,Tanghe County,Henan Province.The tectonic position is located in the middle of the northern slope belt of the Biyang Depression.The structure is complex,and the overall shape is a nasal structure that is oriented to the southeast and has a relatively gentle shape.The west is Yanglou Oilfield,and the south and east are Wangji and Xinzhuang oil fields respectively.Through comprehensive application of seismic,geological,drilling,test mining,research results and other data this paper,the principle of "spin back comparison,hierarchical control" is used to focus on reviewing and subdividing small layers in Wangji North Area.According to the sedimentary characteristics of Wangji North Area and the criteria of the previous stratigraphic division and comparison,based on the drill core analysis data,comprehensive application of logging curves,lithology data and seismic profiles data,guided by high-resolution sequence stratigraphy,using stable mudstone and oil shale as markers,the stratigraphic subdivision and comparison were carried out by using the contrast principle of sedimentary cycle level from large to small and hierarchical control.Wangji North Area has been influenced by multi-stage tectonic movements,the reservoir is thin,the fault system has been developed in the area.But it is hard to identify low-order faults,the fault staggered cut relation complex,fault implementation is difficult.Aimed at this kind of complex fault system,under the guidance of regional geological law,through improving the SNR and resolution of the seismic data by the method of special handling the seismic data and the timely identification ability of reservoir and fault,this paper applies the fault automatic identification technology based on ant algorithm to finely depict low-order fault,and has completed the explanation of the fault system.Mmainly develop the frontal sedimentation of Yanglou,Zhangchang distal delta,Wangji,Houzhuang braided river delta in the studied area,dominated by distributary channel,estuary dam,develop delta front sheet sand at the same time.Under the control of sequence stratigraphic framework and in combination with the distribution law of sedimentary facies belt,this paper uses the abundant drilling and logging data in the existing working area to analyze the sand body distribution characteristics and pore-permeability distribution characteristics;It comprehensively uses the new interpretation results of seismic data,logging interpretation results,trial production data,dynamic and static data of adjacent wells and other data to finish the research on the distribution law of oil and gas.Finally,through summarizing the three types of traps developed in this area,and according to the comprehensive evaluation of the reliability of newly discovered traps,fault preservation conditions,reservoir development characteristics,oil-gas bearing prediction and other aspects,it preferentially selects six favorable trap targets,playing an important guiding role in the oil-gas research and exploration in Wangji North Area.