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Characteristics and Distribution Regularities of the Oil-Gas Reservoir-Forming Assemblages in the Chengbei Fault-Ramp

GAO Chang-hai1,YANG Zi-yu2,ZHA Ming11.Faculty of Geo-Resource and Information,China University of Petroleum,Dongying,Shandong 257061,China2.Research Institute of Exploration and Development,PetroChina Dagang Oilfield Company,Tianjin 300280,China  
Based on the basic characteristics of the source,reservoir and cap rocks,three types of oil-gas reservoir-forming assemblages,called the lower,middle and upper assemblages respectively,as well as two derived,called the lower-middle and the middle-upper assemblages respectively,have been divided in the Chengbei fault-ramp.Different oil-gas reservoir-forming assemblages are of different cha-racteristics.Tectonic activities led to the difference of the strata and sedimentation and to the difference of the source,reservoir and cap rocks from north to south of the fault-ramp.So the lower and the lower-middle oil-gas reservoir-forming assemblages are mainly distributed at adjacent sag areas,i.e.,the first and the second step regions.The middle oil-gas reservoir-forming assemblage is mainly distributed in the second and the third step regions.However,the upper and the middle-upper oil-gas reservoir-forming assemblages are distributed in the third step region and in the southern slope area.
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