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.