Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (2): 54-66.doi: 10.12108/yxyqc.20200206

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Characteristics and sedimentary models of diamictite in saline faulted lacustrine basin: a case study of Fu 2 member in Jinhu Sag,Subei Basin

HUANG Jianling1, FU Qiang1, QIU Xuming2, ZHAO Shijie1, LI Linxiang3   

  1. 1. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China;
    2. Sinopec Jiangsu Oilfield Company, Yangzhou 225009, Jiangsu, China;
    3. Gudong Oil Production Plant, Sinopec Shengli Oilfield Company, Dongying 257237, Shandong, China
  • Received:2019-07-30 Revised:2019-09-16 Online:2020-03-21 Published:2020-01-19

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Abstract: In order to clarify the sedimentary characteristics of diamictiteinsaline faulted lacustrine basin,by means of core observation,core slice identification,X-ray diffraction to whole-rock mineral analysis test and other technical means,the diamictite of the second member of Eocene Funing Formation in Jinhu Sag was studied. The results show that:(1)Diamictite is dominated by feldspar quartz minerals,calcite(dolomite)minerals and clay minerals. It can be divided into four types:feldspar-quartz diamictite, calcite(dolomite) diamictite,clayey diamictite and pure-diamictite.(2)According to the sedimentary characteristics of the saline faulted lacustrine basin in the Jinhu Sag,a mixed sedimentary model of "shallow water to deep water and multi-factor control" was established. In the saline faulted lacustrine basin,the deposition of diamictite is mainly controlled by source supply,fault activityand sedimentary environment changes. Under the active fault control,the terrigenous debris is continuously supplied to the interior of the lacustrine basin, and the sedimentary type is dominated by interfacial mixed sedimentation and intermittent mixed sedimentation. As the fault activity tends to stable,sedimentary environment changes,transgression increases,the sediment of terrigenous debris is limited, and the sedimentary type is dominated by maternal mixed sedimentation. The research results have certain enlightenment significance for the exploration of deep-water tight reservoirs in the continental lacustrine basin.

Key words: tight oil, diamictite, sedimentary type, sedimentary model, Funing Formation, Subei Basin

CLC Number: 

  • TE122.1
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