Oil & Gas Geology ›› 2018, Vol. 39 ›› Issue (4): 653-663.doi: 10.11743/ogg20180403

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Control of tectonics on sedimentation of sandstone and process of sediment filling in multi-fault lacustrine basins: A case study on the Eocene in eastern Zhanhua Sag,Jiyang Depression in Bohai Bay Basin

Dong Daotao1,2, Qiu Longwei1,2, MA Yongda3, Yang Yongqiang1,2, Zou Yu4, Dai Li3, Teng Baogang3, Zhang Zaipeng3   

  1. 1. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China;
    2. Laboratory for Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology, Qingdao, Shandong 266071, China;
    3. Zhuangxi Oil Production Plant of Shengli Oilfield Company Ltd., SINOPEC, Dongying, Shandong 257000, China;
    4. School of Geosciences, Yangtze University, Wuhan, Hubei 430100, China
  • Received:2017-03-21 Revised:2018-06-19 Online:2018-08-28 Published:2018-07-23

Abstract: Extensive research has been carried out on the control of tectonics on sedimentation of sandstone in rift basins.The tectonic-dominated mechanism controlling sandstone development and the process of sediment filling for the upper 4th-3rd member of the Eocene Shahejie Formation (the Es4 and the Es3) in eastern Zhanhua Sag,Jiyang Depression in Bohai Bay Basin,were investigated through well-seismic correlation,core description and thin section observation.The results show that (1) level-Ⅰ tectonic transition zones lay down the macroscopic tectonic-sedimentary framework,and multi-stage tectonic slope breaks and eustatic lake level control the sand body accretion of different system tracts in the third-order sequences and the cyclicity of sedimentary systems; while level-Ⅱ tectonic slope break zones and secondary faults control the local sand transport systems and sand body distribution within the system tracts,and steep slope zones are often infavorable for input of clastics into lake basins;(2) SQ1 and SQ2 have two isolated sand transport systems (Gubei and Gunan),while SQ3 has a single sand transport system with the Gubei and Gunan being combined into one,so small but numerous fan deltas without significant progradation or retrogradation are mainly developed in SQ1,while deltas,(semi-)deep lake and gravity flow sand bodies occur in SQ2,and large-scale deltas are dominant in SQ3,with gravity flow sand bodies being common in the (semi-)deep lake area; (3) Tectonic activities control,via tectonic transition zones,slope breaks,secondary faults and steep slopes,sandstone development and sediment filling process in multi-fault lacustrine basins,whereas paleoclimate can only function to strengthen or weaken the controlling effect of tectonic activities,but will not change the sediment filling process in the basin.

Key words: tectonic transition zone, tectonic slope break zone, mechanism controlling sandstone development, sediment filling, fault basin, Shahejie Formation, Jiyang Depression, Bohai Bay Basin

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