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首页> 外文期刊>Molecules >Geochemical Significance of Biomarkers in the Methane Hydrate-Bearing Sediments from the Shenhu Area, the South China Sea
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Geochemical Significance of Biomarkers in the Methane Hydrate-Bearing Sediments from the Shenhu Area, the South China Sea

机译：南海神湖地区甲烷水合物沉积物中生物标志物的地球化学意义

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摘要

Biomarkers from methane hydrate-bearing sediments can provide vital evidence for microbial activities associated with methanogenesis and their relation to the formation of methane hydrates. However, the former mainly focus on intact polar lipids from these microorganisms, and rarely investigate molecular hydrocarbons such as acyclic isoprenoids and hopanes so far. In this work, the composition of biomarkers in the methane hydrate-bearing sediments in cores SH2B and SH7B from the Shenhu area, the South China Sea (SCS) were identified by gas chromatography-mass spectrometry (GC-MS) and comprehensive two-dimensional gas chromatography/time-of-flight mass spectrometry (GCxGC-TOFMS). The occurrence of unresolved complex mixtures (UCMs) and 25-norhopane indicate that the organic matters in methane hydrate-bearing sediments underwent a high degree of biodegradation. Although specific biomarkers for methanogens were not identified, the UCMs, 25-norhopane, pristane, phytane, and hopanes can still indicate the microbial activities associated with methanogenesis. These molecular signals suggest that diverse microorganisms, particularly methanogens, were quite vigorous in the methane hydrate-bearing sediments. Further, the biomarkers identified in this study can also be steadily detected from deep oil/gas reservoirs. Considering numerous adjacent oil/gas reservoir systems, fault systems, and mud diapers occurred in the SCS, it can be inferred that microbial activities and deep oil/gas reservoirs may have jointly contributed to the formation of methane hydrate deposits in the SCS.
机译：来自甲烷水合物沉积物的生物标志物可以为与甲烷发生相关的微生物活性提供重要证据及其与甲烷水合物形成的关系。然而，前者主要关注来自这些微生物的完整极性脂质，并且很少研究到目前为止的分子烃等分子烃等分子烃。在这项工作中，通过气相色谱 - 质谱（GC-MS）鉴定了核心区核心区SH2B和SH7B中甲烷水合物沉积物中的生物标志物和SH7B的组成，并通过气相色谱 - 质谱（GC-MS）和全面的二维气相色谱/飞行时间质谱（GCXGC-TOFMS）。未解决的复杂混合物（UCMS）和25-炔丙烷的发生表明甲烷水合物沉积物中的有机物质经历了高度的生物降解。虽然未鉴定甲烷的特异性生物标志物，但UCMS，25-诺丙烷，血丙烷，植物和料斗仍然可以表明与甲烷发生相关的微生物活性。这些分子信号表明，不同的微生物，特别是甲烷酮，在甲烷水合物沉积物中非常剧烈。此外，本研究中鉴定的生物标志物也可以从深油/气体储层稳定地检测到。考虑到SCS中发生了众多相邻的油/气体储层系统，故障系统和泥浆尿布，可以推断出微生物活性和深油/气体储层可以共同导致SCS中甲烷水合物沉积物的形成。

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  • 来源
    《Molecules》 |2019年第3期|共12页
  • 作者

    Zhou Qian-Zhi; Li Yan; Chen Fang; Li Shui-Fu; Dong Shu-Jun; Zhang Feng-Lin; Xu Xiao-Ming; Wang Jiang-Hai;

  • 作者单位

    Sun Yat Sen Univ Sch Marine Sci Guangdong Prov Key Lab Marine Resources &

    Coastal Guangzhou 510006 Guangdong Peoples R China;

    Sun Yat Sen Univ Sch Marine Sci Guangdong Prov Key Lab Marine Resources &

    Coastal Guangzhou 510006 Guangdong Peoples R China;

    Guangzhou Marine Geol Survey Guangzhou 510760 Guangdong Peoples R China;

    China Univ Geosci Wuhan Key Lab Tecton &

    Petr Resources Wuhan 430074 Hubei Peoples R China;

    Sun Yat Sen Univ Sch Marine Sci Guangdong Prov Key Lab Marine Resources &

    Coastal Guangzhou 510006 Guangdong Peoples R China;

    Sun Yat Sen Univ Sch Marine Sci Guangdong Prov Key Lab Marine Resources &

    Coastal Guangzhou 510006 Guangdong Peoples R China;

    Sun Yat Sen Univ Sch Marine Sci Guangdong Prov Key Lab Marine Resources &

    Coastal Guangzhou 510006 Guangdong Peoples R China;

    Sun Yat Sen Univ Sch Marine Sci Guangdong Prov Key Lab Marine Resources &

    Coastal Guangzhou 510006 Guangdong Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 有机化学;
  • 关键词

    methane hydrates; biomarkers; unresolved complex mixtures (UCMs); microbial activities; the South China Sea;

    机译：甲烷水合物;生物标志物;未解决的复杂混合物（UCMS）;微生物活动;南海;

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