Analysis Of Structural Characteristics Of Fuyu Reservoir In Wolitun Area Of Anda Depression

Most of the seismic data in Wolitun area of anda sag are collected from deep strata,and in the early exploration deployment of Fuyu oil layer,it was found that the shallow interpretation results in the old data could not meet the current demand for fine exploration.Based on 3d seismic data interpretation as the main line,lie in Wolitun area of seismic data,well logging data and geological data of seismic,reservoir group of Fuyu oil layer in the longitudinal five points of stratigraphic framework,and in the isochronous stratigraphic framework through fine horizon calibration and interpretation,fault interpretation,tectonic characteristics analysis and other methods of the study area purpose layer to carry out the fine3 d interpretation,fine little fault identification,the implementation of the fracture,structure characteristics of the lie in Wolitun area;This paper summarizes the fault system,microstructure,trap and other elements in the study area,and analyzes the structural characteristics that have a guiding role in the control of oil and gas.We have obtained the following summary understanding:1.The Anda syncline,the east slope zone of Anda syncline and two nasal structures(the Wolitun nose and the Wolitunbei nose)developed in the Wolitun area as a whole.2.The fault trend in the Wolitun area is variable,and the small faults in the north-northeast direction are the main ones,and the faults have the characteristics of syndeposition;The faults are densely developed in a zonal pattern,and the densely distributed zones are mainly in the north-south direction.Faults have a controlling effect on the structure,and some tectonic planes have obvious zonation.3.The fault system in Wolitun area has.00 experienced three kinds of fault stages: fault depression stage,depression stage and inversion stage.It has formed four kinds of fault systems: active fault system in depression stage,active fault system in fault-depression stage,active fault system in depression-depression stage,active fault system in depression-inversion stage,and active fault system in fault-sag stage.The fault in Fuyu reservoir is the active fault in the depression-filling period.4.Microstructure and structural traps are well developed in Wolitun area.Microfaulted nose is the most developed in positive microstructure,and microfaulted furrow is the most developed in negative microstructure.Structural traps are dominated by fault-controlled boundary traps,and multi-fault complex traps,single-fault occlusion and cross-fault occlusion have good control effect on oil and gas.