尕斯库勒油田原油成因类型与油源分析

尕斯库勒油田是柴达木盆地最大的油田, 关于其油源一直存在多种说法。通过密集采样和系统分析, 运用获取的大量生物标志物指标, 深入剖析了尕斯库勒油田深层和浅层油藏原油的地球化学特征和成因类型。认为两个油藏内部原油特征非常相似, 均属于盐湖相低成熟原油; 但二者之间存在差异, 应该来自于不同的油源。根据油源对比分析, 结合烃源灶的研究成果, 查明了尕斯库勒油田的油气来源。指出深层原油主要源自茫崖凹陷的E3 烃源灶, 浅层原油则由茫崖凹陷E3 和N1 烃源灶混合而成。

Genetic Types of Crude Oil and Analysis of Oil Sources in Gas Hure Oilfield

Gas Hure oilfield is the largest on in Qaidam basin. There are many opinions about the oil sources in this oilfield. This paper presents its geochemical characteristics and genetic types of crude oil in the deep and shallow reservoirs by abundant biomarker parameters through concentrated sample collection and systematic analysis. It is suggested that the characteristics of crude oil within the two reservoirs are very similar, belonging to typical salt-lake facies and immature crude oil, but differences between them indicate that the oils originate from different oil sources. According to analysis of oil-source correlation and research results of source kitchen, hydrocarbon sources in Gas Hure oilfield are found out. That is, the deep crude oil is from Oligocene source kitchen in Mang'ai sag and the shallow crude oil is from mixed source kitchens of Oligocene and Miocene in Mang'ai sag.