Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (5): 83-96.doi: 10.12108/yxyqc.20250508

• PETROLEUM EXPLORATION • Previous Articles    

Gas generation potential and reservoir formation condition of Permian Fengcheng Formation source rock in Mazhong structural belt of Mahu Sag

LIU Guanbo1, CHEN Shijia1, LI Shihong2, ZOU Yang2, LI Yong1   

  1. 1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    2. Exploration and Development Research Institute, Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China
  • Received:2025-03-17 Revised:2025-04-24 Published:2025-09-06

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Abstract: The deep to ultra-deep oil and gas exploration of Mazhong structural belt in Mahu Sag has gradually become a hot field in Junggar Basin. Based on organic geochemical analysis data of rock cores and hightemperature thermal simulation experiments，the organic matter abundance（TOC），hydrocarbon generation potential（S1 + S2），hydrogen index（HI）of Permian Fengcheng Formation source rocks in Mazhong structural belt of Mahu Sag were systematically analyzed，and the hydrocarbon conversion rate and gas generation potential of the source rocks were estimated.The results show that：（1）The average TOC of Permian Fengcheng Formation source rocks in Mazhong structural belt is 1.2%，the average hydrocarbon generation potential（S1 + S2）is 5.6 mg/g， and the average hydrogen index（HI）is 380 mg/g.The hydrocarbon conversion rate of organic matter is high upto 90%，mainly for oil generation，with a cumulative oil production rate of 829 mg/g. The cumulative gas production rate during the high-mature to over-mature stage is 40 mL/g，and the gas production is relatively low，accounting for only 4.3% of the total hydrocarbon generation.（2）The structural formation period of Mahu and Mabei anticlines is earlier than the main hydrocarbon generation and expulsion period of Fengcheng Formation source rocks，and the reservoir properties were poor，with weak intensity of oil and gas charging.（3）The burial depth of source rocks in Mahu anticline is generally greater than 6 000 m（Ro greater than 1.6%），and hydrocarbon generation has basically stagnated. Moreover，a lack of temperature and pressure conditions for crude oil cracking into gas results in insufficient gas supply and a lack of material basis for forming large-scale gas reservoirs. The burial depth of Mabei anticline is relatively shallow，and the surrounding source rocks are in the mature to high mature stage（Ro being 1.0%-1.5%），which has the potential to form tight light oil reservoirs.

Key words: source rock, hydrocarbon generation conversion rate, gas generation potential, Fengcheng Formation, Permian, Mahu anticline, Mazhong structural belt, Junggar Basin

CLC Number: 

  • TE122.1
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