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Pathway Systems for Hydrocarbon Migration to Binbei District,Songliao Basin,Northeast China

LIN Tie-feng1,2,XIANG Cai-fu3a,3b,FENG Zi-hui2,LI Jun-feng1,WU He-yong2,WANG Fu-dong3a,3b(1.Energy Faculty,China University of Geosciences,Beijing 100083,China;2.Prospecting andExploration Institute of Daqing Oil Field,Daqing Heilongjiang 163458,China;3a.Basin andReservoir Research Center;3b.State Key Laboratory for Petroleum Resource andProspecting,China University of Petroleum,Beijing 102249,China)  
The Binbei District lies in the northeast of the Songliao Basin,covering 1/3 of the total area.Conventional hydrocarbon exploration around local pod of active source rocks has never come to a prominent progress.Hence,a new idea to direct the hydrocarbon exploration is necessary for the oil exploration in this district.The investigation of the hydrocarbon migrated from the main active source pod developed in the south of the Songliao Basin indicates that the pathway system is the key problem.It is discovered that two kinds of pathway systems are composed of anticline and strike-slip fault respectively.Three big anticlines formed by tectonic reversal plunged into the west depression of the Qijia-Gulong Depression,the Heiyupao Depression and the east Depression of Sanzhao respectively,all of which are the main hydrocarbon generating depressions.The anticline of the Suileng plunged into the Sanzhao Depression formed earlier than the maturation of the source rock,indicating a good exploration potential.While the anticline of Keshan plunged into the west Qijia-Gulong Depression formed synchronizedly with the maturation of the source rock,also indicating a rather good exploration potential.The two big pathway systems composed of strike-slip faults have different exploration potential.The anticline of Qianyuan plunged into the depression of Heiyupao,a local hydrocarbon generating depression,has limited hydrocarbon exploration potential.The fault of Binzhou intersects both hydrocarbon generating depression of Qijia-Gulong and Sanzhao,determining its good exploration potential.The activity of the Binzhou Fault is synchronous with the maturation of the source rock,but its late-stage activity is segmented.While the west part of the fault is more active and much stronger than that of the east part,which favors hydrocarbon migration instead of hydrocarbon preservation.
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