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The generation kinetics of natural gases in the Kela-2 gas field from the Kuqa Depression, Tarim Basin, northwestern China

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Abstract

The Kela-2 gas field, found in the Kuqa Depression of the Tarim Basin, northwestern China, is a large-sized dry gas field (C1/C1–5=0.992–0.999) and characterized by ultra-high pressure (pressure factor up to 2.0–2.2). The pyrolysis experiment was carried out under isothermal gold-tube closed system, with samples collected from the Jurassic coal, Jurassic mudstone and Triassic mudstone in the Kuqa Depression. The result of gas yield showed that the Middle and Lower Jurassic source rocks have higher gas generation potential than the Triassic source rocks. The kinetic modeling of gas generation and methane carbon isotope fractionation suggested that the Kela-2 gases belong to the products of high-over mature stages and were mainly derived from the Middle and Lower Jurassic coal-bearing strata. The Triassic source rocks made a minor contribution to the Kela-2 gases. The Kela-2 gases chiefly generated from coal-bearing source rocks with R o values from 1.3% to 2.5%, and thus primarily accumulated after 5 Ma.

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Authors and Affiliations

  1. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing, 100083, China

    Xianqing Li & Songbao Feng

  2. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China

    Xianqing Li, Xianming Xiao, Hui Tian, Dehan Liu & Jiagui Shen

  3. Power, Environmental and Energy Research Center, California Institute of Technology, 738 Arrow Grand Circle, Covina, California, 91722, USA

    Yongchun Tang

  4. Research Institute of Exploration and Development, Tarim Oilfield Company, PetroChina, Korla, 841000, China

    Zhongyao Xiao

  5. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, 100083, China

    Jingkui Mi

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  1. Xianqing Li
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  2. Songbao Feng
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Correspondence to Xianqing Li.

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Li, X., Feng, S., Xiao, X. et al. The generation kinetics of natural gases in the Kela-2 gas field from the Kuqa Depression, Tarim Basin, northwestern China. Chin. J. Geochem. 32, 157–169 (2013). https://doi.org/10.1007/s11631-013-0618-2

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  • DOI: https://doi.org/10.1007/s11631-013-0618-2

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