东疆地区原油芳烃地球化学特征及其意义

The Geochemical Characteristics and Significance of Aromatic Hydrocarbon of Eastern Xinjiang Area Crude Oils

在对东疆地区(包括吐哈盆地和三塘湖盆地)原油饱和烃生物标志物地球化学特征研究基础上,对原油芳烃馏分进行全面分析及地球化学特征研究;通过深入剖析原油芳烃系列组成,明确东疆地区原油类型划分,根据烷基萘、"三芴"系列及卡达烯、惹烯等化合物的分布特征,进一步揭示三塘湖盆地石炭系原油母源沉积水体盐度低、还原性弱,成油母质中包含丰富陆源输入,沉积相带为海陆过渡相。优选的二甲基菲、三甲基菲两项热演化指标与甾烷异构化指数具有良好相关性和一致性,且能在高演化阶段有效指示;应用该两项指标确定三塘湖盆地石炭系卡拉岗组原油为高成熟原油,哈尔加乌组原油为过成熟原油。

Based on the research of saturated hydrocarbon biomarkers of crude oils in Eastern Xinjiang area（including the Turpan-Hami Basin and Santanghu Basin）,a comprehensive analysis and geochemistry study were carried out on aromatic fractions of crude oils.Through analysis of the composition of aromatic hydrocarbon,types of crude oils were divided.The distribution of compounds（alkyl naphthalene,F,OF and SF’,cadalene and retene）shows sedimentary environment of Carboniferous organic matter crude oils in Santanghu Basin were low water salinity,weak reduction,the oil-rich parent materials from terrestrial input,and sedimentary facies transition phase for the land and sea.Optimization of dimethyl phenanthrene,the top three phenanthrene indexes and thermal evolution of the two sterane isomerization indexs have good correlation and consistency,and can effectively indicate the high evolution stage.In addition,application of the two indicators to determine Santanghu Carboniferous Basin Karaoke Gang Unit,department of crude oil is the high maturity crude oil,and Haerjiawu group is overmature crude oil.