Fault-Lithologic Reservoir Exploration Technology and Practice in Gaoyou Sag

In Gaoyou sag of Jiangsu Oilfield,seismic data quality is influenced by structural factors,such as structure crushing and complex field surface conditions,and the thickness of target sand bodies is often less than the vertical seismic resolution.So single sand body cannot be directly identified from seismic section,and it is very difficult 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.