Geochemical characteristics of Jurassic lacustrine source rocks in Kekeya area, Tarim Basin: implications for paleoenvironments and organic matter enrichment

SUN Di; XIE Xiaomin; QU Yang; XIAO Qilin; LI Li; CHEN Cai; WANG Zhanghu

doi:10.11781/sysydz2024061312

Volume 46 Issue 6

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SUN Di, XIE Xiaomin, QU Yang, XIAO Qilin, LI Li, CHEN Cai, WANG Zhanghu. Geochemical characteristics of Jurassic lacustrine source rocks in Kekeya area, Tarim Basin: implications for paleoenvironments and organic matter enrichment[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(6): 1312-1322. doi: 10.11781/sysydz2024061312

Citation:

SUN Di, XIE Xiaomin, QU Yang, XIAO Qilin, LI Li, CHEN Cai, WANG Zhanghu. Geochemical characteristics of Jurassic lacustrine source rocks in Kekeya area, Tarim Basin: implications for paleoenvironments and organic matter enrichment[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(6): 1312-1322. doi: 10.11781/sysydz2024061312

Citation:

SUN Di, XIE Xiaomin, QU Yang, XIAO Qilin, LI Li, CHEN Cai, WANG Zhanghu. Geochemical characteristics of Jurassic lacustrine source rocks in Kekeya area, Tarim Basin: implications for paleoenvironments and organic matter enrichment[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(6): 1312-1322. doi: 10.11781/sysydz2024061312

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Geochemical characteristics of Jurassic lacustrine source rocks in Kekeya area, Tarim Basin: implications for paleoenvironments and organic matter enrichment

doi: 10.11781/sysydz2024061312

SUN Di^1
,,
XIE Xiaomin²,
QU Yang¹,
XIAO Qilin²,
LI Li¹,
CHEN Cai¹,
WANG Zhanghu^{2
,
,}

1.
Research Institute of Exploration and Development, PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, China
2.
Hubei Key Laboratory of Petroleum Geochemistry and Environment, College of Resources and Environment, Yangtze University, Wuhan, Hubei 430100, China

Received Date: 2023-09-28
Rev Recd Date: 2024-09-27
Publish Date: 2024-11-28

Abstract

Abstract

To further reveal the development characteristics of Jurassic source rocks in the southwest depression of the Tarim Basin and their paleoenvironments, with the aim of guiding future shale oil exploration and development, the study integrated rock pyrolysis, maceral analysis, inorganic geochemistry, biomarker compounds, and carbon isotope analyzes.It explored the development characteristics and organic matter enrichment patterns of coal-bearing mudstones from the Lower Jurassic Kangsu Formation and mudstones and silty mudstones from the Middle Jurassic Yangye Formation in the Kekeya area of the southwest depression, Tarim Basin. The results showed that the total organic carbon (TOC) content in the source rocks of the Kangsu and Yangye formations was relatively higher, ranging from 1.7% to 63.5% (with an average of 24.4%), and 0.6% to 6.9% (with an average of 2.1%), respectively, indicating source rocks of good to excellent quality. Source rocks from both formations exhibited low maturity, being in the low-maturity to mature stage.In addition, carbon isotope analysis of kerogen, thin section observations, and biomarker compound analysis indicated that the parent material of the organic matter in the coal-bearing mudstones of the Kangsu Formation and the lower section of the Yangye Formation mainly derived from higher terrestrial plants, while the silty mudstones of the upper section of the Yangye Formation contained abundant planktonic algae. During the depositional period of the Kangsu Formation, the paleoclimate was warm and humid, and the water environment was freshwater, with suboxic and slightly oxidizing conditions. In the early depositional stages of the Yangye Formation, the paleoclimate was also hot and humid, and the depositional environment was similar to that of the Kangsu Formation, characterized by freshwater and suboxic conditions. With the gradual rise in lake level in the late depositional period of the Yangye Formation, the paleoenvironment transitioned to a brackish and suboxic environment. The hot and humid climate, coupled with increased salinity, was conducive to the reproduction of planktonic algae and other aquatic organisms, thereby affecting the organic matter supply in silty mudstones of the upper section of the Yangye Formation. Furthermore, the enhancement of water reducibility during this period was also beneficial for the preservation of organic matter. In summary, paleoclimate, paleosalinity, and depositional environment are important factors influencing the organic matter enrichment in the Jurassic lacustrine source rocks of the Kekeya area.
- paleoclimate,
- suboxic environment,
- organic petrology,
- Yangye Formation,
- Jurassic,
- Kekeya area,
- Tarim Basin

All authors disclose no relevant conflict of interests.
The experiments were designed by SUN Di, XIE Xiaomin, and LI Li. The experimental operation was completed by QU Yang, XIAO Qilin, and CHEN Cai. The manuscript was drafted and revised by SUN Di and WANG Zhanghu. All authors have read the last version of the paper and consented to its submission.

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Geochemical characteristics of Jurassic lacustrine source rocks in Kekeya area, Tarim Basin: implications for paleoenvironments and organic matter enrichment

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Geochemical characteristics of Jurassic lacustrine source rocks in Kekeya area, Tarim Basin: implications for paleoenvironments and organic matter enrichment

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