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<p>The Kuqa Depression, recognized as one of the best hydrocarbon-enriched depressions within the Tarim Basin, has long been debated regarding its principal source intervals, which has restricted petroleum exploration and development in this area. This study focuses on the hydrocarbon source rocks of the Middle-Upper Triassic Karamayi Formation and Upper Triassic Huangshanjie Formation in the northern part of the Kuqa Depression through a comprehensive organic and elemental investigation. The examinations indicate that the source rocks of the Karamayi Formation-Huangshanjie Formation are dark mudstones developed in a lacustrine setting. The organic matter abundance generally ranges from fair to good. The organic matter type is mainly Type II, with a portion being Type III, and the source rocks have reached a mature stage. During the depositional period of the source rocks in the Karamayi Formation, variations in paleoproductivity, characteristics of ancient water bodies and intensity of hydrothermal activity together influenced the organic matter enrichment model of the Misbrac section, which is controlled by preservation conditions and paleoproductivity. In contrast, the Heiyingshan and Kuqa River sections exhibit paleoproductivity-dominated enrichment mechanisms. During the depositional period of the Huangshanjie Formation, the organic matter enrichment model in the study area is controlled by both the preservation conditions and paleoproductivity.</p>

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Differential enrichment mechanisms of organic matter in middle-upper Triassic lacustrine mudstone, north Kuqa depression (Tarim Basin, China): An integrated approach utilizing inorganic and organic geochemical evidence

  • 期刊论文

  • 发表日期：

    2025年8月15日

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  • Dejiang Li,
  • Qun Zhao,
  • Lingyu Zhao,
  • Yanpeng Chen,
  • Ze Deng,
  • Xiangchun Chang,
  • Bingbing Shi,
  • Runye Han,
  • Shangbin Wang

摘要

The Kuqa Depression, recognized as one of the best hydrocarbon-enriched depressions within the Tarim Basin, has long been debated regarding its principal source intervals, which has restricted petroleum exploration and development in this area. This study focuses on the hydrocarbon source rocks of the Middle-Upper Triassic Karamayi Formation and Upper Triassic Huangshanjie Formation in the northern part of the Kuqa Depression through a comprehensive organic and elemental investigation. The examinations indicate that the source rocks of the Karamayi Formation-Huangshanjie Formation are dark mudstones developed in a lacustrine setting. The organic matter abundance generally ranges from fair to good. The organic matter type is mainly Type II, with a portion being Type III, and the source rocks have reached a mature stage. During the depositional period of the source rocks in the Karamayi Formation, variations in paleoproductivity, characteristics of ancient water bodies and intensity of hydrothermal activity together influenced the organic matter enrichment model of the Misbrac section, which is controlled by preservation conditions and paleoproductivity. In contrast, the Heiyingshan and Kuqa River sections exhibit paleoproductivity-dominated enrichment mechanisms. During the depositional period of the Huangshanjie Formation, the organic matter enrichment model in the study area is controlled by both the preservation conditions and paleoproductivity.