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Geochemical Characteristics of Oil and Gas in Hangjinqi Area,Ordos Basin

SUN Chang-qing1,2,RONG Fa-zhun2,ZHAO Ke-bin2(1.China University of Geosciences,Wuhan 430074,China;2.Wuxi Research Institute of PetroleumGeology,Research Institute of Petroleum Exploration and Production,SINOPEC,Wuxi 214151,China)  
Hangjinqi area in the northern Ordos basin had been uplifted from the early Paleozoic to the late Paleozoic.The strata were controlled by the paleo-geomorphology,with significant lateral changes,and had been further reformed during Yanshan period by the structural activities.Thus the formation and the types of hydrocarbon reservoirs in this area are more complicated,and these increase difficulties in oil and gas exploration.Three hydrocarbon anomalous zones had been delineated in Hangjinqi area based on the geochemistry features(the concentration values of the hydrocarbon indicators and their regional variations,the light hydrocarbon components and the hydro-geochemical characteristics) of the study area;and the anomaly formation had been analyzed by the geochemical analysis and the petroleum geological condition analysis.The results show that the gas source is abundant in this area,providing the material basis for the formation of the big and medium gas pools;the sand reservoirs develop widely in the lateral direction,providing good conditions for the natural gas accumulation;and the preservation condition in the area is also good,better in the south part than the north,benefiting for the oil and gas pool preservation.As a result,3 favorable exploration areas had been proposed for further exploration,including Shilijiahan-Well Yi 13 area,Shiguhao area,and Haoraozhao-Zhaojiagou-Jiangjiaqu area.
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