Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (5): 81-94.doi: 10.12108/yxyqc.20210508

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Sedimentary evolution and sedimentary differentiation model of Kepingtage Formation in Shunbei area,Tarim Basin

WANG Suying1, ZHANG Xiang1,2, TIAN Jingchun1,2, PENG Minghong1, ZHENG Xiaoyu1, XIA Yongtao3   

  1. 1. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;
    3. Research Institute of Exploration and Development, Sinopec Northwest Oilfield Company, Urumqi 830011, China
  • Received:2020-12-14 Revised:2021-04-08 Online:2021-10-01 Published:2021-09-30

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Abstract: In order to study the significant differences of sedimentary patterns in different stages in tidal flat-shelf sedimentary system of Kepingtage Formation in Shunbei area of Tarim Basin, by using common section identification, core observation and description, the data of seismic, well logging and single well, a comprehensive analysis was carried out on the basis of the division and comparison of lithologic sections. The results show that:(1) The Kepingtage Formation in Shunbei area is controlled by palaeo-uplift, and there are two types of stratigraphic structures: "three-section" (lower sandstone interval, mudstone interval and sandstone interval are all developed) and "one-section" (lack of lower sandstone interval, mudstone interval or middle and lower part of mudstone interval).(2) Tidal flat-shelf depositional system controlled by palaeo-uplift in the background of transgression is developed in Kepingtage Formation in Shunbei area. The depositional pattern is significantly different in the early and late depositional periods. In the early stage, it was controlled by palaeo-uplift, and the sedimentary facies zones were differentiated in the east-west direction and distributed in a ring along the palaeo-uplift. In the late stage, the paleo-uplift was submerged and no longer controlled the distribution of sedimentary facies zones. Due to the influence of basin boundary, the sedimentary pattern evolved from east-west differentiation to north-south differentiation. The sedimentary facies zones extended from east-west to north-south as a whole, and distributed symmetrically along the continental shelf sedimentary area.(3) Kepingtage Formation has experienced the water by the "shallow-deep, shallow and deep-shallow" evolution of sea-level change, several sets of reservoir-cap assemblages are developed vertically, and subtidal sand flat and tidal-subtidal tidal channel are favorable reservoir sand bodies. The research results can provide favorable target area and exploration direction for oil and gas exploration of marine clastic rocks.

Key words: sedimentary evolution, sedimentary differentiation model, lithologic trap, Silurian, Kepingtage Formation, Tarim Basin

CLC Number: 

  • TE122.1
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