Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (5): 12-23.doi: 10.12108/yxyqc.20190502

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Control of fault activity on sedimentation of Paleogene in Dongpu Sag

YU Haibo1,2, CHENG Xiushen1, QI Jiafu3, TAN Yuming1, XU Tianwu1, ZHOU Yan1   

  1. 1. Research Institute of Exploration and Development, Sinopec Zhongyuan Oilfield Company, Puyang 457001, Henan, China;
    2. Postdoctoral Research Station of Sinopec Zhongyuan Oilfield Company, Puyang 457001, Henan, China;
    3. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China
  • Received:2019-02-25 Revised:2019-04-10 Online:2019-09-21 Published:2019-09-16

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Abstract: In order to study the basin structure,fault activity and its control on sedimentation in Dongpu Sag, seismic data interpretation,non-seismic geophysical data analysis,drilling core and logging curve analysis were carried out. The results show that:(1)The Paleogene basin in Dongpu Sag had the structural characteristics of multi-fault,multi-convex and multi-subsag. The fourth member of Shahejie Formation of Eocene was a single fault lake basin with broad lake surface,forming a set of high-quality source rocks,which were mainly composed of deltaic facies and shallow and semi-deep lake subfacies,and locally deep lake subfacies.(2)The lower submember of the third member of Shahejie Formation was dominated by the structural style of"multi-convex and multi-subsag". The center of the lake basin moved westward,and the hydrocarbon generation interval was somewhat different from that of Sha-4 member. The deposits were delta,shallow lake,semi-deep and deep lake. (3)During the sedimentary period of the upper sub-member of the second member of Shahejie Formation,multisubsag developed successively,the lake basin shrank,and the hydrocarbon generation potential became worse. The Weidong-Wendong fault system began to develop,resulting in a larger sedimentation range in the subsag area in the east and rapid maturity of hydrocarbon source rocks.(4)During the period of frequent fault activity,highquality hydrocarbon source rocks were developed in the region with large fault spacing,and delta front sand bodies, beach bar sand and turbidite sand developed in the nearby subsags adjacent to hydrocarbon source rocks were all good reservoirs. The early formed and long-term active secondary and tertiary faults were the main channels for hydrocarbon migration. Therefore,the turbidite sandstone reservoirs in Liutun and Puwei subsags,the updip pinch-out reservoirs of Sha-3 member in Mazhai subsag can be judged as the tapping potential of future exploration. The research results have guiding significance for the exploration of Dongpu Sag.

Key words: Paleogene, multi-convex and multi-subsag, synsedimentary fault, structural style, basin structure, Dongpu Sag

CLC Number: 

  • TE121.1
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