| Molecular Geochemical Evidence for the Origin of Natural Gas from Dissolved Hydrocarbon in Ordovician Formation Waters in Central Ordos Basin |
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| 作者姓名： | 李贤庆 侯读杰 唐友军 胡国艺 熊波 |
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| 作者单位： | Geochemistry Research Center，Jianghan Petroleum University，The Department of Energy and Geology，China University of Geosciences，Geochemistry Research Center，Jianghan Petroleum University，The Laboratory of Natural Gas Geology，Langfang Branch of Research Institute of Petroleum Exploration and Development，Petrochina，Geochemistry Research Center，Jianghan Petroleum University Jingzhou 434023，China，The State Key Laboratory of Organic Geochemistry，Guangzhou Institute of Geochemistry，Chinese Academy of Sciences，Wushan，Guangzhou 510640，China，Beijing 100083，China，Jingzhou 434023，China，Langfang 065007，China，Jingzhou 434023，China |
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| 基金项目： | theNational“95”ScienceandTechnologyResearchProject (GrantNo.99 1 1 0 0 1 0 3)，theKeyKnowledgeInnovationProjectoftheChineseAcademyofSciences(GrantNo.KZCX 1 1 0 )，ChinaPostdoctoralScienceFoundation (GrantNo.2 0 0 2 0 31 2 82 ) |
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| 摘 要： | 1IntroductionTheOrdosBasinisthesecondlargestoilandgas bearingbasininChina .ItislocatedinthePaleo zoicplatformandbelongstoacratonbasin ,whichisincongruencewiththePaleozoicdepressionattheedgesoftheplatformandtheMesozoic Cenozoicdepressionwithintheplatform .SincethediscoveryofnaturalgasesinWellShancan 1andWellYu 3in 1989,theassessmentandexplorationofOrdovicianweatheringcrustnaturalgasesintheOrdosBasinhaveattractedextensiveatten tion (YangJunjieetal.,1996 ;DaiJinxingetal.,1997) .Thecentral…
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| 关 键 词： | 分子地球化学 天然气 成因 奥陶纪 液化烃 Ordos盆地 |
Molecular geochemical evidence for the origin of natural gas from dissolved hydrocarbon in Ordovician formation waters in central Ordos Basin |
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| Li?Xianqing,Hou?Dujie,Tang?Youjun,Hu?Guoyi,Xiong?Bo.Molecular Geochemical Evidence for the Origin of Natural Gas from Dissolved Hydrocarbon in Ordovician Formation Waters in Central Ordos Basin[J].Chinese Journal of Geochemistry,2003,22(3):193-202. |
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| Authors: | Li Xianqing Hou Dujie Tang Youjun Hu Guoyi Xiong Bo |
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| Institution: | (1) Geochemistry Research Center, Jianghan Petroleum University, 434023 Jingzhou, China;(2) The State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Wushan, Guangzhou, China;(3) The Department of Energy and Geology, China University of Geosciences, 100083 Beijing, China;(4) The Laboratory of Natural Gas Geology, Langfang Branch of Research Institute of Petroleum Exploration and Development, 065007 Petrochina, Langfang, China |
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| Abstract: | Having studied the biomarker composition and maturity of dissolved hydrocarbons from Ordovician formation waters, the authors presented molecular geochemical evidence for the controversial origin of natural gases in central Ordos Basin.The dissolved hydrocarbons in Well Shan 12 and Well Shan 78 are relatively high in abundance of tricylic terpane, pregnane series and dibenzothiophene series and low in Pr/Ph and hopane/sterane ratios, indicating the source input of marine carbonates. In contrast, the dissolved hydrocarbons in Well Shan 81 are free from tricyclic terpane and pregnane series, with trace dibenzothiophene series and high Pr/Ph and higher hopane/sterane ratios, which are the typical features of terrestrial organic matter. Furthermore, Well Shan 37 and Well Shan 34 are between the two situations, having a mixed source of marine carbonate and terrestrial organic matter. The maturity of biomarkers also supports the above suggestions. These results are consistent with the geological background and source rock distribution in this region. |
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| Keywords: | dissolved hydrocarbon origin of natural gas Ordovician formation water Ordos Basin molecular geochemistry |
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