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A set of high-quality lacustrine dark argillaceous source rock is developed in the middle Permian lucaogou formation around Bogda mountain of Xinjiang, which is predicted to have broad shale oil and gas exploration potential. The paleo sedimentary structures environment formed by this set of strata is crucial to accurately evaluate its resource potential. The petrology, geochemical characteristics, petrogenesis and tectonic background of Tuff in the formation period are studied through the testing and analysis of core samples of Tuff in the middle Permian lucaogou formation of the well XJC1. The results show that: ① The aluminum saturation index A/CNK of Tuff samples from lucaogou formation is 0.45–1.21, and the A/NK value is 1.15–1.28, indicating that the rock is aluminous; the distribution curve of rare earth elements shows a right leaning pattern, with obvious negative Eu anomalies, enrichment of large ion lithophile elements such as Ba, Rb, K, and depletion of high field strength elements such as Nb and Ti, making it a typical type of crustal origin; ② The tectonic environment discrimination diagram of trace elements shows that this type of volcanic rock was formed in the active continental margin environment related to subduction. The geochemical analysis of Tuff shows that the regional tectonic background is the back arc Foreland basin at the end of the B-type subduction from the northern Tianshan oceanic crust to the southern margin of the Junggar block; ③ Thin Tuff is developed in a large set of dark mudstones in lucaogou formation, and the lithologic combination mode is conducive to the formation of high-quality source rock. Volcanic ash promotes algal blooms in a large area, is conducive to the formation of organic matter, and plays a positive role in the enrichment and accumulation of Shale oil. The research results are helpful to deepen the understanding of the middle Permian tectonic evolution in the Bogda mountain area of the the Junggar basin, and provide a basic theoretical basis for the prediction of oil and gas resource potential.

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Geochemical Characteristics of Middle Permian Tuff in XJC 1 Well and Its Significance in Oil and Gas Structure Around Bogda Mountain of Xinjiang, NW China

  • 会议论文

  • 发表日期：

    2025年

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  • Yong-jin Gao,
  • You-xing Yang,
  • Lei Wen,
  • Xiang-can Sun,
  • Yi Chen,
  • Zhong-kai Bai,
  • Ya Tian,
  • Li-hong Liu

摘要

A set of high-quality lacustrine dark argillaceous source rock is developed in the middle Permian lucaogou formation around Bogda mountain of Xinjiang, which is predicted to have broad shale oil and gas exploration potential. The paleo sedimentary structures environment formed by this set of strata is crucial to accurately evaluate its resource potential. The petrology, geochemical characteristics, petrogenesis and tectonic background of Tuff in the formation period are studied through the testing and analysis of core samples of Tuff in the middle Permian lucaogou formation of the well XJC1. The results show that: ① The aluminum saturation index A/CNK of Tuff samples from lucaogou formation is 0.45–1.21, and the A/NK value is 1.15–1.28, indicating that the rock is aluminous; the distribution curve of rare earth elements shows a right leaning pattern, with obvious negative Eu anomalies, enrichment of large ion lithophile elements such as Ba, Rb, K, and depletion of high field strength elements such as Nb and Ti, making it a typical type of crustal origin; ② The tectonic environment discrimination diagram of trace elements shows that this type of volcanic rock was formed in the active continental margin environment related to subduction. The geochemical analysis of Tuff shows that the regional tectonic background is the back arc Foreland basin at the end of the B-type subduction from the northern Tianshan oceanic crust to the southern margin of the Junggar block; ③ Thin Tuff is developed in a large set of dark mudstones in lucaogou formation, and the lithologic combination mode is conducive to the formation of high-quality source rock. Volcanic ash promotes algal blooms in a large area, is conducive to the formation of organic matter, and plays a positive role in the enrichment and accumulation of Shale oil. The research results are helpful to deepen the understanding of the middle Permian tectonic evolution in the Bogda mountain area of the the Junggar basin, and provide a basic theoretical basis for the prediction of oil and gas resource potential.