Journal of Southwest Petroleum University(Science & Technology Edition) ›› 2023, Vol. 45 ›› Issue (4): 43-54.DOI: 10.11885/j.issn.1674-5086.2021.10.25.05

• GEOLOGY EXPLORATION • Previous Articles     Next Articles

Mesozoic Faults and Their Control on Oil Reservoirs in Ordos Basin

LUO Anxiang1, LIU Guanglin1,2, LIU Zhengpeng3, SHEN Tiandan4, MA Shuang5   

  1. 1. Research Institute of Exploration and Development, Changqing Oilfieid Company, Petrochina, Xi'an, Shaanxi 710018, China;
    2. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, Sichuan 610059, China;
    3. Exploration Department, Changqing Oilfield Company, PetroChina, Xi'an, Shaanxi 710018, China;
    4. No.8 Oil Production Plant, Changqing Oilfield Company, PetroChina, Xi'an, Shaanxi 710021, China;
    5. No.1 Oil Production Plant, Changqing Oilfield Company, PetroChina, Xi'an, Shaanxi 710018, China
  • Received:2021-10-25 Online:2023-08-10 Published:2023-07-18

Abstract: Aiming at the problems of complex fault system and unclear reservoir distribution in Gufengzhuang Area, Yanchi County, northwest of Ordos Basin, using three-dimensional seismic and balanced profile restoration technology, we identify the fault distribution, delineate the morphology of the fault plane and restore the opening and closing state of the fault, and clarify the formation stage of the faults and favorable reservoir forming conditions. Three fault systems are developed in Gufengzhuang Area. Indosinian faults are mostly normal faults, distributed in en echelon arrangement in NWW direction, opened in the early Cretaceous, and played a role in connecting oil sources and efficiently transporting oil and gas. Yanshanian faults are developed in the west of the area, showing a nearly NS direction, mostly thrust faults, with strong structural deformation, which is not conducive to reservoir preservation. Himalayan faults are in NEE direction, distributed in parallel in the work area, mostly normal faults, formed after reservoir formation, adjusted or destroyed the primary reservoir. The reservoir forming conditions in the fault development area are as follows: the faults communicating with oil source opened in the reservoir forming period; the traps had good conditions and located near the convex ridge of the fault plane (reservoir forming above the source) or near the concave ridge (reservoir forming below the source). The research results have certain guiding significance for oil and gas exploration in fault system development areas.

Key words: fault plane ridge, oil migration and accumulation, Tianhuan Depression, Yanchi, Ordos Basin

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