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首页> 外文期刊>Marine and Petroleum Geology >Biodegradation and possible source of Silurian and Carboniferous reservoir bitumens from the Halahatang sub-depression, Tarim Basin, NW China
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Biodegradation and possible source of Silurian and Carboniferous reservoir bitumens from the Halahatang sub-depression, Tarim Basin, NW China

机译：塔里木盆地哈拉哈塘次凹陷志留系和石炭系储层沥青的生物降解及可能来源

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Five core samples comprising three Silurian and two Carboniferous bituminous sandstones from the Halahatang sub-depression (Tarim Basin, NW China) were studied to determine the nature and extent of microbial alteration and possible source(s) of the reservoir bitumens. A total of twelve Ordovician crude oil samples from this sub-depression were also examined for comparative purposes. Co-occurrence of a series of 25-norhopanes (NHs) (C-28-C-34), variable amounts of chromatographically unresolved complex mixture (UCM), and diminished concentrations of n-alkanes below ca. C-20 in saturated hydrocarbon fractions of the Silurian and Carboniferous bitumens indicates that they are mixtures of heavily biodegraded oil from a former charge and slightly biodegraded oil from a later charge. The presence of C-28-C-34 25-NHs suggests a biodegradation level of at least PM 6 for these bitumen samples. Nevertheless, minor differences in terpane and sterane distributions between the Silurian and Carboniferous bitumen samples were observed which can be attributed to small variations in biodegradation levels. Values for the 25-NH ratio (Peters et al., 1996), gammacerane/(gammacerane + C-30 hopane), C-28 25-NH/C-29 hopane and C-29 25-NH/C-30 hopane ratios indicate slightly higher levels of microbial alteration for the Silurian bitumens compared to the Carboniferous bitumens, although caution must be exercised when comparing the biodegradation intensities using molecular parameters. The Ordovician crude oil samples appear to be more severely biodegraded than the Silurian and Carboniferous bitumens, as evidenced by higher concentrations of tricyclic terpanes relative to hopanes, and pregnanes and diasteranes relative to the regular steranes, although thermal maturity effects cannot be ruled out. Geochemical correlation studies were successfully applied based on carbon isotopes and biomarkers including tricyclic terpanes and triaromatic steroids which are highly resistant to severe biodegradation (PM 6). Bulk isotopic compositions, distribution patterns and certain ratios of these biomarkers indicate that the Ordovician crude oils and the Silurian and Carboniferous bitumens originated from a single source. They were probably derived from Middle-Upper Ordovician source rocks. (C) 2016 Elsevier Ltd. All rights reserved.
机译：研究了来自哈拉哈塘次-陷（中国西北塔里木盆地）的三个志留系岩心和两个石炭系沥青砂岩的五个岩心样品，以确定微生物蚀变的性质和范围以及储层沥青的可能来源。为了进行比较，还检查了来自该次凹陷的总共十二个奥陶纪原油样品。一系列25-去甲胆碱（NHs）（C-28-C-34）的共存，色谱未解决的复杂混合物（UCM）的量可变以及正链烷烃的浓度降低到约200以下。志留系和石炭系沥青的饱和烃馏分中的C-20表明，它们是来自前一次进料的严重生物降解油和来自后一次进料的轻微生物降解油的混合物。 C-28-C-34 25-NHs的存在表明这些沥青样品的生物降解水平至少为PM 6。然而，在志留纪石炭纪和石炭纪沥青样本之间，萜烯和甾烷的分布存在细微差异，这可以归因于生物降解水平的微小变化。 25-NH比值（Peters等，1996），γ-角cer烷/（γ-角cer烷+ C-30 hop烷），C-28 25-NH / C-29 hop烷和C-29 25-NH / C-30 hop烷的值比率表明志留系沥青的微生物变化水平高于石炭纪沥青，尽管在使用分子参数比较生物降解强度时必须谨慎。尽管不能排除热成熟效应，但相对于hop烷，三环戊烷和孕烷和非硬脂烷的浓度较高，这证明了奥陶纪原油样品比志留纪和石炭纪沥青的生物降解程度更高。地球化学相关性研究已成功地基于碳同位素和生物标记物，包括对严重生物降解具有高度抵抗力的三环萜烯和三芳族类固醇（PM 6）。这些生物标记物的大体同位素组成，分布模式和某些比率表明，奥陶系原油以及志留系和石炭系沥青起源于单一来源。它们可能来自奥陶纪中上层烃源岩。 （C）2016 Elsevier Ltd.保留所有权利。

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