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首页> 外文期刊>Journal of natural gas science and engineering >Methanogenesis in the Eocene Tharad lignite deposits of Sanchor Sub-Basin, Gujarat, India: Insights from gas molecular ratio and stable carbon isotopic compositions
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Methanogenesis in the Eocene Tharad lignite deposits of Sanchor Sub-Basin, Gujarat, India: Insights from gas molecular ratio and stable carbon isotopic compositions

机译：Sanchor Sub-Basin，古吉拉特邦，古吉拉特，印度植物植石矿床的甲烷化：来自天然气分子比和稳定的碳同位素组合物的见解

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The present study investigates the molecular ratio and stable carbon isotopic compositions of gas samples from the Lower to Middle Eocene lignite deposits of the Lower to Middle Tharad Formation in the Sanchor Sub-Basin, Gujarat, India, which were understudied, hitherto. The stable carbon isotopic composition of methane (-69.30 to - 57.20%o in BK-5 and from -67.40 to -64.50%o in BK-7 well) may imply the generation of primary microbial gas through the hydrogenotrophic methanogenesis, which was mixed with the early mature thermogenic gas, and this is a novel finding from this study area. The relation between the gas molecular ratio [methane/(ethane + propane)] and the stable carbon isotopic composition of methane confirms the mixing trend (-90--40%) of the primary microbial methane with the early mature thermogenic gas sourced from hydrogen-rich macerals either in situ or at a higher depth that subsequently migrated upwards. Further, the studied gas samples comprise a large amount of carbon dioxide (16.95-32.32 vol.% and from 18.91 to 28.60 vol.% in BK-5 and BK-7 wells, respectively). The relation between the carbon dioxide content and its stable carbon isotopic composition (-21.30 to - 11.80%o and from -11.20 to -9.40%o in BK-5 and BK-7 wells, respectively) may suggest the origin of carbon dioxide from volcanic degassing from the Deccan Trap basaltic magma as well as from coalification through decarboxylation and decarbonylation reactions. So, the mixed origins of carbon dioxide (inorganic + organic) and methane (primary microbial and early mature thermogenic) would have influenced the carbon isotopic difference between carbon dioxide and methane as well as the isotopic discrimination factor, which is also reported for the first time from this investigation. Finally, the relation between the gas molecular ratio and the carbon isotopic difference between carbon dioxide and methane compliments the gas mixing effects. Hence, the novelty of this investigation lies in elucidating the influences of the early mature thermogenic gas on the gas molecular and stable carbon isotopic signatures of primary microbial gas originated through the hydrogenotrophic pathway as depicted by the gas molecular ratio and stable carbon isotopic compositions of methane and carbon dioxide.
机译：本研究调查了印度古吉拉特邦Sanchor子盆地下至中Tharad组始新世至下至中始新世褐煤矿床中的气体样品的分子比和稳定碳同位素组成，这些样品迄今尚未得到研究。甲烷的稳定碳同位素组成（BK-5为-69.30%至-57.20%o，BK-7为-67.40%至-64.50%o）可能意味着通过氢营养产甲烷作用生成原生微生物气体，该作用与早期成熟的产热气体混合，这是该研究区的一个新发现。气体分子比[甲烷/（乙烷+丙烷）]与甲烷的稳定碳同位素组成之间的关系证实了原生微生物甲烷与来自富氢显微组分的早期成熟产热气体的混合趋势（-90-40%），无论是在原地还是在更高的深度，随后向上迁移。此外，所研究的气体样本包含大量二氧化碳（BK-5和BK-7井分别为16.95-32.32%和18.91-28.60%）。二氧化碳含量与其稳定碳同位素组成之间的关系（BK-5和BK-7井中分别为-21.30%至-11.80%和-11.20%至-9.40%的氧）可能表明二氧化碳的来源于德干圈闭玄武岩岩浆的火山脱气，以及通过脱羧和脱羰反应的煤化。因此，二氧化碳（无机+有机）和甲烷（原生微生物和早熟产热）的混合来源将影响二氧化碳和甲烷之间的碳同位素差异以及同位素鉴别因子，这也是本次调查首次报告。最后，气体分子比与二氧化碳和甲烷之间碳同位素差异之间的关系补充了气体混合效应。因此，本研究的新颖之处在于阐明了早期成熟的产热气体对通过氢营养途径产生的原生微生物气体的气体分子和稳定碳同位素特征的影响，如甲烷和二氧化碳的气体分子比和稳定碳同位素组成所示。

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