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酸性化合物是辽河稠油的主要化学组成部分。对辽河盆地高升油田莲花油层沙三段4个主要砂体(4、5、6、7砂体)稠油样品的分子地球化学研究表明 ,其酸性化合物类型包括饱和的和不饱和的直链脂肪酸、单甲基支链(异构 和反异构)脂肪酸、类异戊二烯酸、五环三萜类羧酸、甾烷类羧酸、单环芳构有机酸和酚、多环羧酸和少量的氮硫化合物。饱和烃和酸性化合物在各砂体中的存在和分布特征对比分析的结果表明 ,有机质的分布在各砂体中的变化不能简单地用母岩来源的差异和地层层析作用来解释,而更可能是遭受生物降解和水洗作用。这4个砂体储层具有相同的油源 ,但储层的构造环境对后期有机质输入的类型、生物降解和水洗作用的强弱等地球化学过程有着重要的影响,并导致了非烃化合物在不同砂体储层中分布的明显差异。原油的化学组成与储层构造条件相关的这一特性为多方面的油藏地球化学研究提供了基础性条件
Acidic compounds are the major chemical components of Liaohe heavy oil. The molecular geochemical studies of heavy oil samples from four major sand bodies (4,5,6,7 sand bodies) in the third member of the Shahejie Formation of the Lianhua reservoir in the Qiansheng Oilfield of Liaohe Basin show that the types of acidic compounds include saturated and unsaturated linear fatty acids , Monomethyl branched (isomeric and trans-isomeric) fatty acids, isoprenoid acids, pentacyclic triterpene carboxylic acids, steranes carboxylic acids, monocyclic aromatic organic acids and phenols, polycyclic carboxylic acids And a small amount of nitrogen and sulfur compounds. The results of comparative analysis of the existence and distribution characteristics of saturated hydrocarbons and acidic compounds in various sand bodies indicate that the variation of organic matter distribution in each sand body can not be simply explained by the differences in source rocks and the role of formation tomography, May be biodegradable and water-washed. The four sandstone reservoirs have the same source of oil. However, the tectonic setting of the reservoir has an important influence on the geochemical processes such as the type of organic matter input, the biodegradation and the water-washing effect, and leads to the non-hydrocarbon compounds Significant differences in the distribution of different sand reservoirs. The chemical composition of crude oil related to reservoir tectonic conditions provides the basic conditions for various aspects of reservoir geochemistry