Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (4): 79-88.doi: 10.12108/yxyqc.20220408

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Characteristics of Permian concealed structures in western margin of Ordos Basin and its significance for oil and gas exploration

YIN Yuyi1,2, YAO Zhichun3, GUO Xiaobo1, WANG Leli2, CHEN Siqian2, YU Xiaolei2, CEN Xiangyang2   

  1. 1. School of Earth Science and Engineering, Xi'an Shiyou University, Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi'an Shiyou University, Xi'an 710065, China;
    2. Changqing Branch, Geophysical Research Institute, BGP, CNPC, Xi'an 710021, China;
    3. Department of Exploration, PetroChina Changqing Oilfield Company, Xi'an 710018, China
  • Received:2021-08-30 Revised:2022-02-11 Online:2022-07-01 Published:2022-07-07

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Abstract: Based on the actual drilling data of 3D seismic,non-seismic and wellYT2,combined with the structural evolution characteristics of Yindongzi area in the western margin of Ordos Basin and its relationship with oil and gas accumulation,the structural characteristics,oil and gas accumulation conditions and exploration prospects of thrust nappe structure in this area were studied. The results show that:(1)The structural model of Yindongzi area in the western margin of Ordos Basin is a typical forward thrust structural,moreover,the new thrust bodies were developed under the old ones,with Weizhou-Anguo fault(Wei'an fault),Qinglong Mountain- Pingliang fault(Qingping fault)and Huianpu-Shajingzi fault(Huisha fault)stretching from the west to the east accordingly.(2)There were obvious folding and deformation within the strata in the footwall of Huisha fault and Qingping fault because of the effect of nappe stress from west to east in Yanshan period,additionally,there were concealed structures developed in rows.(3)The concealed structures have obvious controlling effect on hydrocarbon accumulation in the western margin of Ordos Basin. With good source-reservoir assemblages in Permian, the concealed structures promote the development of multiple sets of sandstone reservoirs,and the development traps are relatively considerable and the preservation conditions are relatively better to some extent. Therefore,it is regarded as favorable areas for the exploration within Upper Paleozoic in the western margin of Ordos Basin.

Key words: features of concealed structure, tectonic evolution, hydrocarbon accumulation, Permian, western margin of Ordos Basin

CLC Number: 

  • TE121.2
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