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CHEN Wenbin, FU Xiugen, TAN Fuwen, ZENG Shengqiang, FENG Xinglei. 2017. Organic geochemistry of Carboniferous-Permian sources rocks in Qiangtang Basin, Tibet[J]. Geology in China, 44(3): 499-510. doi: 10.12029/gc20170308
Citation: CHEN Wenbin, FU Xiugen, TAN Fuwen, ZENG Shengqiang, FENG Xinglei. 2017. Organic geochemistry of Carboniferous-Permian sources rocks in Qiangtang Basin, Tibet[J]. Geology in China, 44(3): 499-510. doi: 10.12029/gc20170308
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Organic geochemistry of Carboniferous-Permian sources rocks in Qiangtang Basin, Tibet

  • 1.

    Chengdu Institute of Geology and Mineral Resources, Chengdu 610081, Sichuan, China

  • 2.

    Key Laboratory for Sedimentary Basin and Oil and Gas Resources, Ministry of Land Resources, Chengdu 610081, Sichuan, China

    • Fund Project: Supported by the Program of China Geological Survey (No. GZH201400301, No.1212011221114), National Natural Science Foundation of China (No. 41172098)
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  • Author Bio: CHEN Wenbin, male, born in 1979, senior engineer, master, engages in the petroleum geological study of the Qiangtang Basin; E-mail: cdcwenbin@qq.com
Received Date:  03 March 2016
Revised Date:  20 June 2016
Publish Date:  25 June 2017
    Abstract

  • The Jurassic source rocks have long been one of the research hotspots, but the Carboniferous-Permian source rocks' capability of hydrocarbon generation has not aroused much attention due to the scattered distribution in Qiangtang Basin. Organic geochemical characteristics of carbonate rock and mudstone samples from eight sections in the Carboniferous-Permian strata of Qiangtang Basin were analyzed for the organic matter abundance, types and thermal evolution. The authors found that source rocks, including carbonate rock and mudstone, were influenced by the evolution of sedimentary environment. The carbonate source rocks might have been the micrite limestone of the carbonate platform, and the mudstone source rocks were mainly the dark mudstone of delta and slope facies and tuffaceous mudstone. The organic carbon content of Carboniferous-Permian mudstone is higher, suggesting hydrocarbon-generative potential; most sections have moderate to high content of organic carbon except Rejuechaka section which has no or poor source rock. Kemo section and Gongri section have mainly reached the standard of mid-good hydrocarbon source rock. However, the Carboniferous-Permian carbonate rock shows a lower content of organic carbon, with no or poor source rock. The type of organic matter of Carboniferous-Permian carbonate rock is mainly Ⅱ1, but the type of organic matter of Carboniferous-Permian mudstone is mainly Ⅱ2 and Ⅲ. The degree of thermal evolution of Carboniferous Permian source rock is generally high, and all the source rocks, except for the Kemo areas where the source rock is at the mature stage, are mostly in the high mature and over-mature stage. Such a situation is very favorable for the generation of natural gas and has a good prospect of natural gas exploration.

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