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Features of Carbonate Buried Hill Oil and Gas Reservoir in Yingmaili-Yaha Region,Tarim Basin

ZHANG Nian-chun1,2,CUI Hai-feng2,TENG Tuan-yu2,MENG Xiang-xia2(1.Chengdu University of Technology,Chengdu 610059,China;2.Northwest Branch,Research Institute of Petroleum Exploration & Development,PetroChina,Lanzhou 730020,China)  
Based on understanding of Cambrian dolomite buried hill oil-gas reservoir and main control factors of reservoir rock development in the Yinmaili-Yaha region,we used variation of relative wave impedance and polarizabitity of electric-magnetic depth sounding to illustrate the lateral heterogeneity of carbonate reservoir.The result showed that the oil pool was a part of bottom water block and whole quasi-layered reservoir.The formation of this pool is related to lateral buried-hill reservoir anisotropy,lateral lithological variation,weathering and erosion degree of buried hill surface,and continuous oil-gas adjusting and filling(active oil-gas source).Then,we built the model of Yingmaili-Yaha oil pool formation.Not only does this model explain why oil-water interface is different in the same buried reservoir,but also hydrocarbon distribution is not controlled by local structural traps.
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