岩性油气藏 ›› 2024, Vol. 36 ›› Issue (1): 88–97.doi: 10.12108/yxyqc.20240109

• 地质勘探 • 上一篇    下一篇

准噶尔盆地东道海子凹陷二叠系平地泉组烃源岩特征

李二庭1,2, 米巨磊1,2, 张宇1,2, 潘越扬1,2, 迪丽达尔·肉孜1,2, 王海静1,2, 高秀伟1,2   

  1. 1. 新疆砾岩油藏实验室, 新疆 克拉玛依 834000;
    2. 中国石油新疆油田公司实验检测研究院, 新疆 克拉玛依 834000
  • 收稿日期:2022-08-22 修回日期:2022-09-09 出版日期:2024-01-01 发布日期:2024-01-02
  • 第一作者:李二庭(1988-),男,博士,高级工程师,主要从事油气勘探地质研究工作。地址:(834000)新疆克拉玛依市克拉玛依区准噶尔路32号。Email:lierting@petrochina.com.cn。
  • 基金资助:
    中国石油重大工程技术现场试验项目“准噶尔南缘和玛湖等重点地区优快钻完井技术集成与试验”（编号：2019F-33）资助。

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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摘要： 东道海子凹陷是准噶尔盆地二叠系重要的勘探领域之一，二叠系平地泉组是该区烃源岩发育的重点层系。通过对东道海子凹陷烃源岩分布及有机质地球化学特征分析，明确了平地泉组烃源岩生烃潜力及生成油气的类型。研究结果表明： ①东道海子凹陷平地泉组烃源岩的Pr/nC17值为0.35～1.18，Ph/nC18值为0.23～0.81，显示其生烃母质主要为混合源，既有陆地生物的贡献，也有水体生物的贡献。②纵向上，平一段和平二段烃源岩质量最好，平一段的好—优质烃源岩占比为81.1%，TOC平均值为1.88%，平二段的好—优质烃源岩占比为62.5%，TOC平均值为1.55%，而平三段的好—优质烃源岩仅占30.2%。平一段和平二段烃源岩主要为Ⅱ型，占比分别为66.7%和48.4%，既可生油也可生气，平三段烃源岩质量较差，以Ⅲ型干酪根为主，具有一定的生气潜力；平面上，烃源岩从边缘区向凹陷区逐渐变好。③凹陷边缘区的烃源岩达到成熟演化阶段，凹陷区烃源岩埋深较大，达到高—过成熟演化阶段，该套烃源岩在埋深约为2 500 m时达到生烃门限，在埋深为4 350 m处达到大量排烃门限，而当埋深大于5 050 m时，进入大量裂解生气阶段。④研究区油气分布明显受烃源岩分布及成熟度控制，在远源端剥蚀区浅层侏罗系八道湾组发现成熟油，下凹斜坡区二叠系以轻质油为主，而凹陷中心以平地泉组“自生自储”气藏为主。

关键词: 烃源岩, 生烃潜力, 地球化学特征, 自生自储, 平地泉组, 二叠系, 东道海子凹陷, 准噶尔盆地

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

中图分类号: 

  • TE122.1
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