Geochemical characteristics of Jurassic lacustrine source rocks in Kekeya area, Tarim Basin: implications for paleoenvironments and organic matter enrichment
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,...
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Editorial Office of Petroleum Geology and Experiment
2024-11-01
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| Series: | Shiyou shiyan dizhi |
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| Online Access: | https://www.sysydz.net/cn/article/doi/10.11781/sysydz2024061312 |
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| author | Di SUN Xiaomin XIE Yang QU Qilin XIAO Li LI Cai CHEN Zhanghu WANG |
| author_facet | Di SUN Xiaomin XIE Yang QU Qilin XIAO Li LI Cai CHEN Zhanghu WANG |
| author_sort | Di SUN |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-14626d12a5cd487cbc1bc1e15d2fb887 |
| institution | DOAJ |
| issn | 1001-6112 |
| language | zho |
| publishDate | 2024-11-01 |
| publisher | Editorial Office of Petroleum Geology and Experiment |
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| series | Shiyou shiyan dizhi |
| spelling | doaj-art-14626d12a5cd487cbc1bc1e15d2fb8872025-08-20T02:49:26ZzhoEditorial Office of Petroleum Geology and ExperimentShiyou shiyan dizhi1001-61122024-11-014661312132210.11781/sysydz2024061312sysydz-46-6-1312Geochemical characteristics of Jurassic lacustrine source rocks in Kekeya area, Tarim Basin: implications for paleoenvironments and organic matter enrichmentDi SUN0Xiaomin XIE1Yang QU2Qilin XIAO3Li LI4Cai CHEN5Zhanghu WANG6Research Institute of Exploration and Development, PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, ChinaHubei Key Laboratory of Petroleum Geochemistry and Environment, College of Resources and Environment, Yangtze University, Wuhan, Hubei 430100, ChinaResearch Institute of Exploration and Development, PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, ChinaHubei Key Laboratory of Petroleum Geochemistry and Environment, College of Resources and Environment, Yangtze University, Wuhan, Hubei 430100, ChinaResearch Institute of Exploration and Development, PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, ChinaResearch Institute of Exploration and Development, PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, ChinaHubei Key Laboratory of Petroleum Geochemistry and Environment, College of Resources and Environment, Yangtze University, Wuhan, Hubei 430100, ChinaTo 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.https://www.sysydz.net/cn/article/doi/10.11781/sysydz2024061312paleoclimatesuboxic environmentorganic petrologyyangye formationjurassickekeya areatarim basin |
| spellingShingle | Di SUN Xiaomin XIE Yang QU Qilin XIAO Li LI Cai CHEN Zhanghu WANG Geochemical characteristics of Jurassic lacustrine source rocks in Kekeya area, Tarim Basin: implications for paleoenvironments and organic matter enrichment Shiyou shiyan dizhi paleoclimate suboxic environment organic petrology yangye formation jurassic kekeya area tarim basin |
| title | Geochemical characteristics of Jurassic lacustrine source rocks in Kekeya area, Tarim Basin: implications for paleoenvironments and organic matter enrichment |
| title_full | Geochemical characteristics of Jurassic lacustrine source rocks in Kekeya area, Tarim Basin: implications for paleoenvironments and organic matter enrichment |
| title_fullStr | Geochemical characteristics of Jurassic lacustrine source rocks in Kekeya area, Tarim Basin: implications for paleoenvironments and organic matter enrichment |
| title_full_unstemmed | Geochemical characteristics of Jurassic lacustrine source rocks in Kekeya area, Tarim Basin: implications for paleoenvironments and organic matter enrichment |
| title_short | Geochemical characteristics of Jurassic lacustrine source rocks in Kekeya area, Tarim Basin: implications for paleoenvironments and organic matter enrichment |
| title_sort | geochemical characteristics of jurassic lacustrine source rocks in kekeya area tarim basin implications for paleoenvironments and organic matter enrichment |
| topic | paleoclimate suboxic environment organic petrology yangye formation jurassic kekeya area tarim basin |
| url | https://www.sysydz.net/cn/article/doi/10.11781/sysydz2024061312 |
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