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首页> 外文期刊>Organic Geochemistry: A Publication of the International Association of Geochemistry and Cosmochemistry >Biogeochemical identification of the Quaternary biogenic gas source rock in the Sanhu Depression, Qaidam Basin
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Biogeochemical identification of the Quaternary biogenic gas source rock in the Sanhu Depression, Qaidam Basin

机译：柴达木盆地三湖De陷第四系生物成因气源岩的生物地球化学识别

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摘要

Biogenic gas, an important type of natural gas, is produced by sedimentary organic matter via methanogenic processes through aerobic respiration, nitrate reduction and bacterial sulfate reduction (BSR) after burial. These diagenetic processes take place under special conditions and environments, and produce specific products. Based on a study of tracers of different diagenetic stages, this paper thoroughly examines various rocks of the Quaternary gas-producing province in the Sanhu Depression, Qaidam Basin. The possible source rocks for the biogenic gas were identified through investigating the special minerals, characteristics of organic matter, and their inter-relationship. The results demonstrated that the abundance of the primary active organic matter constrained the diagenetic stages of sediments. Mudstones with extremely low abundance of organic matter are at a stage of aerobic degradation and have not reached the reducing stage yet. The organic carbon is dominated by recycled black carbon with low hydrocarbon generative potential. Mudstones containing a little more organic matter are mainly at the BSR stage. The associated sedimentary organic matter is dominated by algae and chitin, which have been converted into inert components due to extensive BSR. BSR has thus reduced the hydrocarbon generative potential and the activity of organic matter, leaving little reactive organic matter for the methanogenesis process. Carbonaceous mudstones with a high abundance of organic matter, on the contrary, contain abundant algae and higher plants that can largely survive BSR and remain active after the BSR stage. These sediments constitute the primary gas source in the study area.
机译：生物气是一种重要的天然气，它是由沉积有机物通过产甲烷过程，有氧呼吸，硝酸盐还原和细菌硫酸盐还原（BSR）的产甲烷过程产生的。这些成岩过程在特殊条件和环境下发生，并产生特定的产物。在研究不同成岩阶段示踪剂的基础上，本文彻底研究了柴达木盆地三湖De陷第四纪产气省的各种岩石。通过研究特殊矿物质，有机质特征及其相互关系，确定了生物气的可能源岩。结果表明，主要活性有机质的丰富性限制了沉积物的成岩阶段。有机物含量极低的泥岩处于需氧降解阶段，尚未达到还原阶段。有机碳主要由具有低烃生成潜力的回收黑碳主导。含有更多有机质的泥岩主要处于BSR阶段。伴随的沉积有机物以藻类和几丁质为主，由于广泛的BSR，它们已转化为惰性成分。因此，BSR降低了碳氢化合物的生成潜能和有机物的活性，几乎没有用于甲烷化过程的反应性有机物。相反，具有高有机质含量的碳质泥岩含有丰富的藻类和高等植物，这些植物可以在BSR中生存并在BSR阶段之后保持活跃。这些沉积物构成了研究区域的主要气体源。

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