Response of Phase Fractionation of Diamantane Compounds in Crude Oil of Lunnan Uplift

详细信息   

• 责任者：Wu Nan (College of Geosciences ; Yangtze University ; Jingzhou 434023 ; China) ; Cai Zhongxian
• 刊名：Fault-Block Oil and Gas Fields
• 出版年：2012
• 卷期：19(4)
• 页码：p.458-461
• issnNo：ISSN1005-8907
• isbnNo：CN41-1219/TE

摘要

Phase fractionation is an important form in the process of adjustment and reconstruction of reservoir for marine carbonate rock measures in our country. Nowadays, identification mark of phase fractionation is mainly limited to the differentiate ratio of C7 series compound（methylcyclohexane, normal heptane and mehtylbenzene）. However, light hydrocarbon such as C5-C6 is so instable thai oxidative degradation, water washing, changing of temperature and pressure conditions, hydrocarbon migration and even in the process of analysis and test will alternate its composition. Therefore, it is an inaccurate way to apply the C7 series compound as an identification sign of phase fractionation action, diamantane compounds is a kind of hydrocarbon compound with a strong anti-thermolysis and antibiodegradation capability. Through the analysis of diamantane series of crude oil in the typical phase fractionation action area（Lunnan uplift area） of gas washing in Tarim Basin, it is believed that the crude oil after gas washing is characterized by 1-methyladamantane enrichment and depletion of 1,3-dimethyladamantane, 1,4-dimethyladamantane, and 3-methyl-1-ethyladamantane. Therefore, the diamantane compounds can be used as an effective tracking mark of phase fractionation.