不同沉积环境湖相低熟原油的芳烃分布特征

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研究表明,不同沉积环境湖相的低熟原油芳烃生物标志物分布具有较大的差异。淡水湖相低熟原油芳烃以萘和菲系列化合物为主要组份、膏岩盐湖相低熟原油芳烃以脱羟基维生素E和三芳甾烷为主要组份、盐岩湖相低熟原油芳烃则以三芳甾烷为主要组份、其它生物标志化合物组份的相对丰度均较低。本次研究的低熟原油芳烃中普遍检测出明显的苯并藿烷系列化合物、盐湖相低熟原油芳烃中还检测出藿烷酮化合物,表明该地区古环境中细菌、微生物发育,它们是该地区沉积有机质在较低演化阶段早期排烃形成低熟原油芳烃的重要生源。低熟原油芳烃中均检测出三芳甾烷系列化合物,且环境为盐湖相时,其相对丰度更高,三芳甾烷可能是低演化有机质和咸化环境的特征标志化合物。咸化环境的低熟原油中均检出了碳数分布较宽、羰基取代位复杂的烷基酮系列化合物,该系列化合物也可能是低演化有机质和咸化环境的特征标志物。脱羟基维生素E系列化合物是膏岩盐湖相特殊沉积环境和低演化有机质的特征标志物。研究样品中均检出较丰富的两环芳构化β胡萝卜烷(M=546,B.P=134)及其以m/z134和120为基峰的带有类异戊二烯烷烃侧链的烷基苯同系物。它们是该地区低熟原油中丰富的植烷和较低碳数类异戊二烯烷烃的来源? The results show that there are great differences in the distribution of aromatics biomarkers of low-mature crude oils in lakes of different depositional environments. Freshwater lakes low-mature crude aromatics with naphthalene and phenanthrene series compounds as the main component, gypsum salt lake low-mature crude aromatics to dehydroxyvitamin E and triarylstannane as the main component of salt rock low-mature oil aromatics with Triarylstannane as the main component, the relative abundance of other bio-marker compounds are low. In this study, a series of benzodiphenolate compounds were widely detected in the low-mature oil aromatics. Antagonists of the anthraquinones were also detected in the low-mature aromatics of the salt lake phase, indicating the development of bacteria and microorganisms in the ancient environment in the region. Regional deposition of organic matter in the early stages of lower evolution of hydrocarbons to form a low-mature oil aromatics important source. The triarylstane series compounds were detected in the low-mature oil aromatics, and the relative abundance was higher when the environment was salt lacustrine. Triarylsanes may be the characteristic marker compounds with low-yielding organic matter and salinization environment. A series of alkyl ketone compounds with wide carbon number distribution and complex carbonyl substitution sites were found in low-mature crude oil of salinization environment. These compounds may also be characteristic markers of low-yielding organic matter and salinization environment. Dehydroxyvitamin E series compounds are characteristic markers of special sedimentary environment and low-grade organic matter of gypsum-salt lake facies. In the study samples were found more abundant bicyclic aromatized β  carrot alkane (M = 546, B. P = 134) and its m / z 134 and 120 as the base peak with the isoprenoid side Alkyl benzene homologues of the chain. Are they the source of abundant phytane and lower-carbon isoprenoid hydrocarbons in low-grade crude oil in the region?
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