Oil & Gas Geology ›› 2025, Vol. 46 ›› Issue (1): 108-122.doi: 10.11743/ogg20250108

• Petroleum Geology • Previous Articles     Next Articles

Delineation of the southern structural boundary of the Yimeng Uplift in the Ordos Basin and its implications for hydrocarbon exploration

Gang TIAN1,2,3,4(), Mingde LU5, Haijun XUE1,3, Xiaogang WEN1,3, Li MA2,3, Anlong YUAN5, Lijun SONG6, Renhai PU4, Huichong JIA7, Jie CHEN8, Shuo CHEN1,2, Dalin WU1, Minghui YANG8()   

  1. 1.Shaanxi Coalfield Geophysical Prospecting and Surveying Co. ,Ltd. ,Xi’an,Shaanxi 710005,China
    2.Shaanxi Coal Geology Group Co. ,Ltd. ,Xi’an,Shaanxi 710021,China
    3.Key Laboratory of Coal Resources Exploration and Comprehensive Utilization,Ministry of Natural Resources,Xi’an,Shaanxi 710021,China
    4.Department of Geology,Northwest University,Xi’an,Shaanxi 710069,China
    5.Exploration and Development Research Institute,Liaohe Oilfield of CNPC,Panjin,Liaoning 124010,China
    6.School of Earth Sciences and Engineering,Xi’an Shiyou University,Xi’an,Shaanxi 710065,China
    7.North China Petroleum Bureau,SINOPEC,Zhengzhou,Henan 450006,China
    8.College of Geosciences,China University of Petroleum (Beijing),Beijing 102249,China
  • Received:2024-05-14 Revised:2024-11-30 Online:2025-02-28 Published:2025-03-03
  • Contact: Minghui YANG E-mail:691561570@qq.com;yangmh@cup.edu.cn

Abstract:

The boundary between two tectonic units in the northern Ordos Basin, namely the Yimeng Uplift and the Yishan Slope, remains controversial. In this study, we analyze the basement relief, stratigraphic distribution, basement faults, tectonic evolution, and hydrocarbon distribution characteristics in the northern Ordos Basin. The results indicate that the EW-NE-striking basement faults in the northern Ordos Basin governed the formation of the Yimeng Uplift as ramp structures. Among these basement faults, the pre-existing Xinzhao North-Porjianghaizi South (F4+F10) basement fault zone serves to separate the structural units before the Mesoproterozoic. The Hangjinqi fault zone (HFZ) runs across the northern Ordos Basin and consists primarily of three large-scale basement faults arranged in en echelon arrays, including the Porjianghaizi, Wulanjilinmiao, and Sanyanjing faults, which evolves from the selectively reactivated basement fault zone pre-existing as mentioned above during the Caledonian. During the Hercynian, Indosinian, and Yanshanian, The HFZ continued its inherited activities, having governed the tectono-sedimentary evolutionary framework of the northern Ordos Basin throughout various geological periods. The northern and southern basin separated by the HFZ exhibit significant differences in tectonic activity intensity, distribution and maturity of source rocks, variations in reservoirs and their physical properties, and hydrocarbon trap types. It can be concluded thereby that the HFZ controls the hydrocarbon generation and distribution in the northern Ordos Basin. It is, thereby, more reasonable to take the HFZ as the boundary between Yimeng Uplift and Yishan Slope, which will be of great significance to deepening understanding on the geology of the northern Ordos Basin and thereby guiding the hydrocarbon exploration therein.

Key words: hydrocarbon exploration, structural boundary, Hangjinqi fault zone (HFZ), Yimeng Uplift, Ordos Basin

CLC Number: