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Superimposing and Rebuilding of the Middle-Upper Yangtze Basins and Its Prospects of Oil and Gas in Marine Strata

NI Xinfeng1,2,3),CHEN Hongde4),WEI Dongxiao3),LIU Wenjun4)1)Research Institute of Petroleum Exploration and Development,PetroChina,Beijing,100083;2)Postdoctor Workstation of Tarim Oilfield,PetroChina,Korla,Xinjiang,841000;3)Hangzhou Institute of Geology,PetroChina,Hangzhou,310023;4)Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu,610059  
The superimposing and rebuilding of basins effectively or destructively controls the formation and migration of resources,and accumulation over different tectonic stage in middle-upper Superimposed Yangtze Basin.Based on the basin evolution and source-reservoir-cap combination,overlay relationship of basins is divided into two types,they are the covered type(continuous covered type,discontinuous covered type)and uncovered type(upper assemblage holding type,lower assemblage holding type).The superimposed relationship between Mesozic and Caniozoic continental basin and pro-Mesozoic and Cenozoic marine basin affect the formation,evolution,migration,conservation and destruction of the hydrocarbon.The destruction which is build up by uplifts,depression,thrust,corrugation,block-faulting and thermo kinetic action during the basin evolution because of the polycyclic tectonic movements affect accumulation in different degree.Finally,it is suggested that the prospecting of continuous covered type is the most superiority.Chenhu-Tuditang double-synclines in southern Jianghan basin which is discontinuous covered types,has advantage geology conditions.The prospect of oil and gas in upper assemblage holding type areas is worth carefully studying and exploring,as far as the preservation conditions.The areas of lower assemblage holding type also have good prospect.For those special overlay relation of large nappe structure,formation of oil/gas reservoir and exploration should be highlighted in footwall marine bed.
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