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Novel geochemical proxies derived from 1D simulation of Liaohe oil sand bitumen to monitor in-situ combustion process
Journal of Analytical and Applied Pyrolysis ( IF 6 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.jaap.2020.104811
Yan Liu , Haiping Huang , Xiaohong Xu , Qicheng Liu , Denglin Han , Haiqing Cheng , Dongsheng Wu , Hongxing Yan

Abstract 1-D combustion tube in-situ combustion (ISC) simulation experiment has been performed on a natural bitumen bearing core. Five ISC zones were distinguished on the basis of the temperature filed and oil saturation analysis of the experiment. A suite of six oil sand residues at different locations after ISC simulation (initial, oil bank, condensation, coking, combustion zone and burned zone, respectively) were obtained for further analysis by using gas chromatography-mass spectrometry to assess the ISC impact and possible proxies monitoring the ISC process. Compounds in the saturated and aromatic hydrocarbon fractions change systematically with increasing temperatures. The concentrations of various compound classes increase generally from the initial zone to the combustion zone, then decrease drastically in the burned zone. However, different compounds show distinct behaviors during ISC and several geochemical proxies were temporary proposed. The amount of light molecular weighted n-alkanes increases significantly, while isoprenoids and heavy molecular weighted n-alkanes show the same trend but less dramatic changes. The ratios of n-C17/pristane (Pr) and n-C18/pyhtane (Ph) and ∑n-C20−/∑n-C20+ increase continuously from the initial zone to the combustion zone and clearly reflect ISC impact. A similar proxy can be derived from the ratio of summed n-alkanes to summed pentacyclic terpanes (∑n-alkanes/∑PTs), which increase more perceptibly due to easy decomposition of biomarkers. In the aromatic fraction, the most sensitive proxy to monitor ISC is derived from degree of alkylation of aromatic homologues. Non-substituted compounds especially naphthalene and phenanthrene increase constantly from the initial zone to the burned zone accompanied by the depletion of highly alkylated counterparts. Some newly formed compounds such as 2-methylanthracene and benz[a]anthracene are defined combustion evidence. However, commonly used maturity parameters based on relative stability of different isomers show no significant variation and cannot serve as valid ISC proxies.

中文翻译:

来自辽河油砂沥青一维模拟的新型地球化学代理监测原位燃烧过程

摘要 对天然沥青轴承芯进行了一维燃烧管原位燃烧(ISC)模拟实验。根据实验的温度场和含油饱和度分析,区分了五个ISC区。通过使用气相色谱-质谱法评估ISC影响和可能的情况,获得了一套ISC模拟后不同位置(分别为初始、油库、冷凝、焦化、燃烧区和燃烧区)的六种油砂残留物,用于进一步分析。代理监控 ISC 过程。饱和烃和芳烃馏分中的化合物随着温度的升高而系统地变化。各种化合物类别的浓度通常从初始区到燃烧区增加,然后在燃烧区急剧下降。然而,不同的化合物在 ISC 期间表现出不同的行为,并且临时提出了几种地球化学代理。轻分子量正构烷烃的数量显着增加,而类异戊二烯和重分子量正构烷烃显示出相同的趋势,但变化不大。n-C17/pristane (Pr) 和 n-C18/pyhtane (Ph) 和 ∑n-C20−/∑n-C20+ 的比率从初始区到燃烧区不断增加,清楚地反映了 ISC 的影响。可以从总正烷烃与总五环萜烷的比率 (∑n-烷烃/∑PTs) 得出类似的代理,由于生物标志物的容易分解,其增加更明显。在芳烃馏分中,监测 ISC 的最敏感指标来自芳烃同系物的烷基化程度。未取代的化合物,尤其是萘和菲,从初始区到燃烧区不断增加,伴随着高度烷基化对应物的消耗。一些新形成的化合物如 2-甲基蒽和苯并 [a] 蒽被定义为燃烧证据。然而,基于不同异构体相对稳定性的常用成熟度参数没有显着变化,不能作为有效的 ISC 代理。
更新日期:2020-06-01
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