Intramolecular isotopic evidence for bacterial oxidation of propane in subsurface natural gas reservoirs
Intramolecular isotopic evidence for bacterial oxidation of propane in subsurface natural gas reservoirs
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DOI：
10.1073/pnas.1817784116
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发表时间：
2019-04-02
影响因子：
11.1
通讯作者：
Ueno, Yuichiro
中科院分区：
文献类型：
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作者：
Gilbert, Alexis;Lollar, Barbara Sherwood;Ueno, Yuichiro
烃类的微生物厌氧氧化是潜在地涉及无数地质和生物化学环境的关键过程，然而众所周知，在自然环境中仍然难以识别和量化。我们进行了特定位置的碳同位素分析丙烷裂解和孵化实验。厌氧细菌氧化丙烷导致一个明显的和以前未识别的（13）C富集丙烷的中心位置，这与同位素签名与产热过程。这种独特的特征允许检测和量化不同天然气储层中烃类的厌氧氧化，并表明这一过程可能比以前认为的更普遍。特定位置的同位素分析可以阐明天然气碳氢化合物的命运，并提供一个主要的，但以前神秘的过程控制全球重要的温室气体的地球化学循环的洞察力。
Microbial anaerobic oxidation of hydrocarbons is a key process potentially involved in a myriad of geological and biochemical environments yet has remained notoriously difficult to identify and quantify in natural environments. We performed position-specific carbon isotope analysis of propane from cracking and incubation experiments. Anaerobic bacterial oxidation of propane leads to a pronounced and previously unidentified( 13)C enrichment in the central position of propane, which contrasts with the isotope signature associated with the thermogenic process. This distinctive signature allows the detection and quantification of anaerobic oxidation of hydrocarbons in diverse natural gas reservoirs and suggests that this process may be more widespread than previously thought. Position-specific isotope analysis can elucidate the fate of natural gas hydrocarbons and provide insight into a major but previously cryptic process controlling the biogeochemical cycling of globally significant greenhouse gases.