Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (1): 120-131.doi: 10.12108/yxyqc.20230111

• PETROLEUM EXPLORATION • Previous Articles    

Sedimentary facies characteristics and sedimentary model of thin sand bodies of Lower Cretaceous Shushanhe Formation in Xinhe area, northern Tarim Basin

HE Chunfeng1, ZHANG Xiang1,2, TIAN Jingchun1,2, XIA Yongtao3, YANG Yanru1, CHEN Jie1, WANG Xinyu1   

  1. 1. School 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, Northwest Oilfield Company, Sinopec, Urumqi 830011, China
  • Received:2022-05-27 Revised:2022-07-21 Published:2023-01-06

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Abstract: The Lower Cretaceous Shushanhe Formation in Xinhe area is one of the potential fields of lithologic reservoir exploration in northern Tarim Basin. Based on the drilling data from 15 wells and 3D seismic interpretation results，the stratigraphic division of Lower Cretaceous Shushanhe Formation in Xinhe area of northern Tarim Basin was carried out，the sedimentary microfacies characteristics and plane distribution of Shushanhe Formation were studied，and the sedimentary model of thin sand bodies was established. The results show that: (1) Shushanhe Formation in Xinhe area is in conformity contact with the overlying Baxigai Formation and overlying the denuded basement of Shaya uplift，and can be divided into Shu 1 member，Shu 2 member and Shu 3 member. (2) The rock of Shushanhe Formation in the study area is mainly lithic arkose，followed by feldspathic lithic sandstone and arkose. The microfacies of shore shallow lake mud and shore shallow lake sand bar can be identified. (3) Before the deposition of Shushanhe Formation in the study area，three-level paleogeomorphology of uplift， low uplift and depression developed，which controlled the distribution of sedimentary facies. During the sedimentary period of Shu 1 member，the sedimentary range is limited to the depression area. The strata of Shu 2 member overlapped from the depression area to the east and west sides，and the sedimentary area expanded. The sedimentary period of Shu 1 and Shu 2 members presents the distribution characteristics of shore-shallow lake facies belt from the east and west sides to the middle. During the sedimentary period of Shu 3 member，the study area was further transgressive into shallow lake sediments. (4) The thin sand bodies of Shushanhe Formation in the study area are important exploration fields，and their distribution is controlled by paleogeomorphology，lake level change and paleowater depth before sedimentation.

Key words: paleogeomorphology, shore-shallow lake mud, shore-shallow lake sand bar, thin sand body, Shushanhe Formation, Lower Cretaceous, Xinhe area, northern Tarim Basin

CLC Number: 

  • TE122.2
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