Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (1): 35-42.doi: 10.3969/j.issn.1673-8926.2017.01.005

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Origin and distribution of sandbody in slope break zone：a case study of the Lower Cretaceous Qingshuihe Formation in Chepaizi area,Junggar Basin

LI Xiao1,2, LIU Hailei1, WANG Xueyong1, BIAN Baoli1, YANG Fan3, CHEN Gangqiang1   

  1. 1. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
    2. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    3. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China
  • Received:2016-09-25 Revised:2016-11-18 Online:2017-01-21 Published:2017-01-21

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Abstract: The slope break zone in hydrocarbon-abundant depression is an important exploration area for stratigraphic reservoirs. Stratigraphic overlap controlled by four different levels of slope break zone in six stages is developed in Qingshuihe Formation in Chepaizi area,Junggar Basin. In order to investigate the controlling factors of petroleum accumulation and distribution,the sedimentary facies was studied by the data of drilling,core and seismic attributes,combined with the technologies of stratigraphy and paleogeomorphology restoration,the origin and controlling factors of reservoir were discussed,and the favorable reservoir and potential exploration prospects were defined. The results show that Qingshuihe Formation developed meandering river delta and shore-shallow lacustrine sedimentary facies,and can be characterized by“mud-rich and sand-poor”and limited high quality reservoir distributions. The favorable reservoir distribution was controlled by the“dual”(thrust squeeze-stress relief)systems tract formed by episodic squeeze,sedimentary facies,valley topography and slope break zone. The delta front facies developed at the under-part of the slope break zone is favorable for high-quality reservoir enrichment and potential for petroleum prospecting.

Key words: seismic sedimentology, stratal slicing, beach bar sand bodies, Baiyanghe Formation, Jiuxi Basin

CLC Number: 

  • TE122.2
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