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Geochemistry and origin of deep-seated cracked gas on the northern slope of the Dongying Sag, Shandong Province

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Abstract

Deep-seated cracked gas exploration was achieved great breakthrough in Es4 L of the Minfeng area on the northern slope of the Dongying Sag. Carbon isotopic and molecular compositions studies revealed the characteristics of wet gas and a normal trend of carbon isotopic composition. Empirical cutoff points of δ13C2 and δ13C3 and light hydrocarbon compositions distinguished the cracking gas as sapropelic gas. Variations in i/nC5, i/nC4 and δ13C2 further confirmed that the gas was cracked from residual kerogen. Source characteristics indicated that the gas was derived from mature-highly mature source rocks of Es4 with kerogen type II being dominant mixed with some oil-cracking gas. Burial history modeling indicated that there were two hydrocarbon charging periods in Es4 L reservoirs. The first period refers to the Guantao-Minghuazhen stage dominated by oil charging, while the second period refers to the Minghuazhen stage and has been dominated by cracked gas charging till now.

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Authors and Affiliations

  1. Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals, Shandong University of Science and Technology, Qingdao, 266510, China

    Xiangchun Chang, Zuozhen Han, Xiaofei Shang & Chengpeng Yan

  2. Geological Scientific Research Institute of Shengli Oilfield Company, SINOPEC, Dongying, 257001, China

    Youde Xu

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  1. Xiangchun Chang
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  2. Zuozhen Han
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  3. Youde Xu
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  4. Xiaofei Shang
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  5. Chengpeng Yan
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Correspondence to Xiangchun Chang.

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Chang, X., Han, Z., Xu, Y. et al. Geochemistry and origin of deep-seated cracked gas on the northern slope of the Dongying Sag, Shandong Province. Chin. J. Geochem. 30, 353–358 (2011). https://doi.org/10.1007/s11631-011-0519-1

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  • DOI: https://doi.org/10.1007/s11631-011-0519-1

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