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乌夏地区稠油分布于距油源玛湖凹陷远距离的断裂上盘中生界超覆尖灭带上,与正常原油呈弧状分布。稠油具有高密度、高粘度、高沥青质、高酸值、低蜡、较高凝固点的特征,体现了生物降解原油的基本特征。根据其物性、地球化学特征将其稠变过程划分为4个阶段,其中长距离通过不整合面运移遭受水洗和生物降解是导致原油稠变的主要因素。其成藏主要与不整合和浅部正断层有关。
The heavy oil in Wuxia area is distributed over the overhanging craters of the Mesozoic over the upper fault Mahu sag in oil source, and is distributed in an arc with normal crude oil. Heavy oil has the characteristics of high density, high viscosity, high asphaltene, high acid value, low wax and high freezing point, which reflects the basic characteristics of biodegradable crude oil. According to their physical and geochemical characteristics, the thickening process is divided into four stages. Among them, long-distance transport through the unconformity surface is subject to water washing and biodegradation, which are the main factors causing the thickening of crude oil. Its accumulation is mainly related to unconformity and shallow normal faults.