Analysis of sequence and lithologic traps by seismic sub-layer correlation
Yang Ling1, Bao Zhidong1, Chen Kaiyuan2, Li Jinbo3, Zhang Peiyuan4
1. College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;
2. School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China;
3. China National Offshore Oil Corporation Research,Beijing 100027,China;
4. China Southern Petroleum Exploration and Development Corporation,CNPC,Guangzhou,Guangdong 510240,China
Abstract：In order to divide exactly seismic sequences of Qigequan formation and understand structural features inside these sequences in Sanhu area of Qaidam Basin,seismic sub-layer correlation is used to process and interpret seismic data.Combining with the Wheeler domain transformation map of seismic sub-layers,core data,well logging data and analysis test data,Qigequan formation is subdivided into five sequences from the bottom to the top,and the identification marks of sequence boundaries and flooding surfaces are determined.Each Qigequan formation sequence which has no obvious breaks is comprised of lacustrine transgressive system tract and lacustrine regressive system tract.And the lacustrine transgressive system tracts are mainly characterized by retroprogradation sequence while the lacustrine regressive system tracts mainly characterized by oprogradation sequence.Then the sequence mode of the research area is proposed.Combining with the updip pinchout of seismic sub-layers,sandbody correlation and structural analysis,our study points that the lithologic traps of work area mainly distribute in eastern Taijinar,eastern Seniehu,western Tuofengshan uplift area and northern Tuofengshan,southern Seniehu,western Salt Lake slope area.
