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首页> 外文期刊>Geoscience journal >Biodegradation characteristics of bitumen from the Upper Devonian carbonates (Grosmont and Nisku Formations) in Alberta, Canada
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Biodegradation characteristics of bitumen from the Upper Devonian carbonates (Grosmont and Nisku Formations) in Alberta, Canada

机译：加拿大艾伯塔省上牧民（Grosmont和Nisku Closations）沥青的生物降解特征

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In this study, we investigated the biodegradation processes of bitumen from the Upper Devonian carbonates (Grosmont and Nisku Formations) in Alberta using GC and GC-MS analyses of four drilling cores. The analyzed samples contain notable rich extracted bitumen, which is predominantly composed of NSO and asphaltene compounds and has lesser amounts of saturated and aromatic hydrocarbons (HCs). The GC and GC-MS results for both saturated and aromatic HCs indicate that there are considerable variations among the samples, which are primarily attributed to the differences in the degree of biodegradation involving microbial activity. The sulfur content and its isotope values for the samples also support biodegradation. Three groups can be classified based on the biomarker distributions as follows: (1) in Group 1, C-19-C-25 tricyclic terpanes are most abundant, particularly the C-23 compounds; (2) Group 2 has no C-30-C-35 alpha beta hopanes and more abundant 25-norhopanes than the other two groups; and (3) Group 3 is similar to Group 1, but generally has less abundant C-19-C-25 tricyclic terpanes than Group 1. The reservoir alteration processes have notably influenced the biomarker properties of the samples. The most pronounced effects are the reduction of the amounts of C-30+ hopanes and increasing demethylated hopanes, particularly in Groups 1 and 2, but not in Group 3. For Group 3, unlike Group 1, the degradation of hopanes apparently does not result in demethylated hopanes, indicating that there is another pathway to produce hopanes and/or destroy demethylated hopanes. These findings indicate that the biodegradation processes that occurred in the Grosmont and Nisku Formations have been spatially and vertically varied due to the different environmental conditions and microbial processes.
机译：在这项研究中，我们研究了使用GC和GC-MS分析了四个钻孔的GC和GC-MS分析了来自艾伯塔省的上牧民碳酸盐（GroSmont和Nisku型）的沥青的生物降解过程。分析的样品含有值得注意的富含填充沥青，其主要由NSO和沥青质化合物组成，具有较少量的饱和烃（HCS）。饱和和芳香族HC的GC和GC-MS结果表明样品中存在相当大的变化，其主要归因于涉及微生物活性的生物降解程度的差异。样品的硫含量及其同位素值也支持生物降解。基于生物标志物分布可以分类三组：（1）在第1组中，C-19-C-25三环萜酯最丰富，特别是C-23化合物; （2）第2组没有C-30-C-35αβ胃蛋白，比其他两组更丰富25-诺尔甘蔗; （3）第3组类似于第1组，但通常具有较少的C-19-C-25三环萜酯，而不是组1.储层改变方法尤其影响了样品的生物标志物性质。最明显的效果是减少C-30 +霍瓦斯的量和增加去甲基化斗，特别是在第1组和2组中，但不在第3组中。对于第3组，与第1组不同，荷兰人的降解显然不会产生在去甲基化斗牛队中，表明还有另一种途径来生产料斗和/或破坏去甲基化的斗牛。这些发现表明，由于不同的环境条件和微生物过程，GroSmont和Nisku结构中发生的生物降解过程已经在空间和垂直变化。

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