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Geoscience ›› 2022, Vol. 36 ›› Issue (05): 1230-1241.DOI: 10.19657/j.geoscience.1000-8527.2021.141

• Hydrocarbon-bearing Basins • Previous Articles     Next Articles

Tectonic Characteristics and Hydrocarbon Accumulation Models of the Buried-hill in Shulu Sag, Jizhong Depression

WANG Peng1(), ZHANG Yufei2, YANG Lili3, YANG Shuangtao4, WANG Fang1, WAN Zhaofei1, JIA Xidong3, WEI Yibing1, JIANG Hongyu1, WANG Yongjun1   

  1. 1. Geological Research Center, BGP Geological Research Institute, CNPC, Zhuozhou, Hebei 072750, China
    2. Huabei Oilfield Company, Exploration and Production Research Institute, Renqiu, Hebei 062552, China
    3. Eastern Geological Company Tarim Geophysical Research Institute, CNPC, Korla, Xinjiang 841000, China
    4. Overseas Business Department, BGP Geological Research Institute, CNPC, Zhuozhou, Hebei 072750, China
  • Received:2021-04-19 Revised:2022-03-10 Online:2022-10-10 Published:2022-11-03

Abstract:

The Shulu Sag was developed on the Archaean metamorphic crystalline basement, and had undergone four tectonic stages: Meso-/Neo-Proterozoic rifting, Paleozoic cratonic basin, Mesozoic tectonic transformation-modification and Cenozoic fault-depression basin. It is a typical multi-layered basin of platform-fault-depression. Due to the multiple tectonic movements, various buried hills are well developed. Based on previous buried hill studies and combining with 3D multi-block-jointed seismic data from the Shulu sag, the local buried hill types are systematically classified, and their tectonic characteristics and source-reservoir-cap correlation are described. We divided the buried hills into denudation and stretch types according to their origin, and into denudation stump, unconformity, fault-step, fault-channel erosion ditch, fault-barrier and fault-block types based on their morphology. Buried hill development in the Shulu sag exhibits zonation patterns, and according to the tectonic location it can be divided into raised, gentle-slope, trough, and steep-slope buried hill belts. Different types of buried hills were developed in the different tectonic zones. We show that there are a large number of large-scale buried hills in the Mesoproterozoic and Paleozoic Shulu sag, which is an important type of oil-gas reservoir for exploration breakthrough in the sag.

Key words: buried hill, tectonic characteristic, hydrocarbon distribution, Shulu Sag

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