Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (1): 88-97.doi: 10.12108/yxyqc.20240109

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Source rock characteristics of Permian Pingdiquan Formation in Dongdaohaizi sag，Junggar Basin

LI Erting1,2, MI Julei1,2, ZHANG Yu1,2, PAN Yueyang1,2, DILIDAER Rouzi1,2, WANG Haijing1,2, GAO Xiuwei1,2   

  1. 1. Xinjiang Laboratory of Petroleum Reserve in Conglomerate, Karamay 834000, Xinjiang, China;
    2. Research Institute of Experiment and Detection, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China
  • Received:2022-08-22 Revised:2022-09-09 Online:2024-01-01 Published:2024-01-02

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Abstract: Dongdaohaizi sag is one of the important exploration fields for Permian in Junggar Basin, and the Permian Pingdiquan Formation is the key formation for the development of source rocks in this area. Based on the analysis of source rock distribution and geochemical characteristics of organic matters, the hydrocarbon generation potential and types of the source rocks of Pingdiquan Formation in Dongdaohaizi sag were determined. The results show that:(1) The Pr/nC17 and Ph/nC18 of Pingdiquan Formation source rocks in Dongdaohaizi sag are 0.35-1.18 and 0.23-0.81, respectively, indicating that the source rocks are mainly sourced from mixed facies, with contributions from both terrestrial and aquatic organisms.(2) Vertically, Ping-1 member and Ping-2 member have the best source rock types. The proportion of good-quality source rocks of Ping-1 member and Ping-2 member is 81.1% and 62.5%, respectively, and the average TOC is 1.88% and 1.55%, respectively. The proportion of good-quality source rocks in Ping-3 member is only 30.2%. The source rocks of Ping-1 member and Ping-2 member are mainly type Ⅱ, accounting for 66.7% and 48.4% respectively, which can generate both oil and gas. The source rocks of Ping-3 member are of poor quality, dominated by type Ⅲ kerogen, and have certain gas potential. On the plane, from marginal area to sag area, the source rocks gradually become better.(3) The source rocks in the marginal area have reached mature evolution stage, and the source rocks in the sag have large burial depth, reaching high and over-mature evolution stage. Source rocks of Pingdiquan Formation reach hydrocarbon generation threshold at about 2 500 m, and massive hydrocarbon expulsion threshold at 4 350 m. When the depth reaches 5 050 m, it is in the stage of massive pyrolysis and gas generation.(4) The distribution of oil and gas in the study area is obviously controlled by the distribution and maturity of source rocks. Therefore, mature oil is mainly found in the shallow Jurassic Badaowan Formation in the far-source denudation area, and light oil is found in Permian in sag slope area. However, the exploration in deep sag should take self-generating and self preserving gas reservoirs of Pingdiquan Formation as target.

Key words: source rock, hydrocarbon generation potential, geochemical characteristics, self-generating and self preserving, Pingdiquan Formation, Permian, Dongdaohaizi sag, Junggar Basin

CLC Number: 

  • TE122.1
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