关键词: 地质背景分析, 高分辨率层序地层学, 断层—岩性油气藏, 叠前地震反演, 地震AVO正演, 属性分析

Abstract: In Gaoyou sag of Jiangsu Oilfi eld, seismic data quality is infl uenced by structural factors, such as structure crushing and complex fi eld surface conditions, and the thickness of target sand bodies is often less than the vertical seismic resolution. So single sand body cannot be directly identifi ed from seismic section, and it is very diffi cult to improve reservoir prediction accuracy using existing seismic data. Through the analysis of geological background in Gaoyou sag and the high resolution sequence stratigraphy research, the analysis of sedimentary background, sedimentary sand body development and sand control mechanism research of Dainan Formation, the integrated use of geological, well logging, drilling and seismic data, a set of fault-lithologic reservoir exploration method is established: according to the qualitative and semi-quantitative and quantitative reservoir prediction, use prestack seismic inversion, AVO forward modeling and seismic attribute analysis technology to determine sand body development area, carry out quantitative reservoir thickness forecast, finally integrate qualitative and quantitative research results to improve reservoir prediction accuracy, and provide favorable drilling targets. High success rate proves that the method is effective in fault-lithologic reservoir exploration.