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<p>The western margin of the Ordos Basin is located in the western part of the Tianhuan Pass and the eastern edge of the western margin retrograde zone, with a special tectonic position. Due to the scarcity of drilling wells and the lack of high-quality seismic data, it is difficult to identify the tectonics of the study area, and the understanding of the characteristics of faults and rifts and the period of their activity is still unclear. Natural fractures are developed in various sections of the Mesozoic in the central western margin of the Ordos Basin, and the fracture characteristics have spatial and temporal variability. This paper combines the regional tectonic stress environment background, analyses the causes of faults and fractures and clarifies the relationship between faults and fractures, analyses the relationship between faults and fractures and existing reservoirs, the distribution of well planes and profiles, and the production rate, etc. It analyses the period of oil and gas reservoirs and the period of fault and fracture activities, and explores the role of fault activities in the formation and enrichment of oil reservoirs. The faults in different periods are compared with the related well planes to analyse the relationship between the faults and reservoirs in different periods and to explore the role of fault activities in oil and gas formation. The results show that: the near-south-north faults are the largest in scale, with large fracture spacing and complex fault plane features; the north-west faults are small in scale, mainly developed in the Extension Formation, with geese-type features; the north-east-east faults are large in scale, with a late development period, and with a parallel distribution of nearly equidistant spacing. The formation of NEE- and NE-trending fractures is closely related to the NEE-trending faults. Faults and associated fractures had different controlling effects on oil reservoirs in different periods. Faults and fractures in the Indo-Chinese and Yanshan phases communicated between the long7 hydrocarbon source rocks and the upper and lower sandstone reservoirs, which provided a good channel for the upward petroleum transport, and at the same time, the faults and fractures improved the physical properties of the reservoirs, which contributed to the formation of the oil and gas reservoirs.</p>

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Study on the Relationship Between Faults and Hydrocarbon Formation

  • 期刊论文

  • 发表日期：

    2025年7月29日

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  • Zishu Yong,
  • Jingong Zhang,
  • Jihong Li,
  • Yao Zhao,
  • Wanting Wang

摘要

The western margin of the Ordos Basin is located in the western part of the Tianhuan Pass and the eastern edge of the western margin retrograde zone, with a special tectonic position. Due to the scarcity of drilling wells and the lack of high-quality seismic data, it is difficult to identify the tectonics of the study area, and the understanding of the characteristics of faults and rifts and the period of their activity is still unclear. Natural fractures are developed in various sections of the Mesozoic in the central western margin of the Ordos Basin, and the fracture characteristics have spatial and temporal variability. This paper combines the regional tectonic stress environment background, analyses the causes of faults and fractures and clarifies the relationship between faults and fractures, analyses the relationship between faults and fractures and existing reservoirs, the distribution of well planes and profiles, and the production rate, etc. It analyses the period of oil and gas reservoirs and the period of fault and fracture activities, and explores the role of fault activities in the formation and enrichment of oil reservoirs. The faults in different periods are compared with the related well planes to analyse the relationship between the faults and reservoirs in different periods and to explore the role of fault activities in oil and gas formation. The results show that: the near-south-north faults are the largest in scale, with large fracture spacing and complex fault plane features; the north-west faults are small in scale, mainly developed in the Extension Formation, with geese-type features; the north-east-east faults are large in scale, with a late development period, and with a parallel distribution of nearly equidistant spacing. The formation of NEE- and NE-trending fractures is closely related to the NEE-trending faults. Faults and associated fractures had different controlling effects on oil reservoirs in different periods. Faults and fractures in the Indo-Chinese and Yanshan phases communicated between the long7 hydrocarbon source rocks and the upper and lower sandstone reservoirs, which provided a good channel for the upward petroleum transport, and at the same time, the faults and fractures improved the physical properties of the reservoirs, which contributed to the formation of the oil and gas reservoirs.