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Geoscience ›› 2022, Vol. 36 ›› Issue (04): 1095-1104.DOI: 10.19657/j.geoscience.1000-8527.2022.206

• Oil and Gas Exploration • Previous Articles     Next Articles

Diagenesis and Diagenetic Facies of Upper Wuerhe Formation in the Shawan Sag

YU Jingwei1(), LUO Gang2, LI Bin2, PAN Tuo3, YU Haitao3, KUANG Hao4, CHU Xu1, ZHANG Xiaotong1   

  1. 1. China University of Petroleum (Beijing) at Karamay, Karamay, Xinjiang 834000, China
    2. Exploration Division of Xinjiang Oilfield Company, Karamay, Xinjiang 834000, China
    3. Research Institude of Exploration and Development, Xinjiang Oilfield Company, Urumqi, Xinjiang 830014, China
    4. Chongqing University of Science and Technology, Chongqing 401331, China
  • Received:2021-12-05 Revised:2022-02-10 Online:2022-08-10 Published:2022-09-09

Abstract:

The Permian Upper Wuerhe Formation is a key exploration target zone in the Shawan Sag, which is a typical lithologic reservoir. Fewer studies were dedicated to the diagenesis of Upper Wuerhe Formation, which hinders deeper exploration. The data of slice, physical property, SEM and electromagnetic spectrum, combined with lithologic analysis and reservoir reserve characters, were applied to analyze the diagenetic types and facies. The results show that the diagenetic types comprise compaction, cementation and resolution. According to the diagenetic phenomena and characters, we concluded that the diagenetic evolution of Upper Wuerhe Formation has already been in the middle diagenetic stage B. Based on the intensity and typical phenomenon diagenesis, the diagenetic facies could be divided into five types, including the strong compaction tight, strong compaction-medium resolution, medium-strong compaction-calcite cementation-weak resolution, medium-strong compaction-mixed-layer illite cementation-weak resolution, and the medium-strong compaction-zeolite cementation-weak resolution digenetic facies. Combined with the Fisher typical discriminant, the diagenetic facies were built on discriminant functions to analyze the diagenetic facies distribution patterns, which would provide a foundation for deeper exploration.

Key words: diagenesis, diagenetic facies, reservoirs, Upper Wuerhe Formation, Shawan Sag

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