原油轻烃地球化学特征研究  

Study on Geochemical Characteristics of Light Hydrocarbon in Crude Oil

作　　者：吴夏[1] 李生涛[1] 万慧 王丹玲[1] 梁健 WU Xia;LI Sheng-tao;WAN Hui;WANG Dan-ling;LIANG Jian(Yangtze University, Hubei Wuhan 430100, China)

机构地区：[1]长江大学地球科学学院,湖北武汉430100

出　　处：《当代化工》2018年第4期840-843,共4页Contemporary Chemical Industry

摘　　要：轻烃是原油中含有的重要物质之一,对轻烃地球化学特征的深入研究有利于我国油气的勘探与开发。为深入研究西湖凹陷中央构造带原油轻烃地球化学特征,采用异庚烷值以及庚烷值来对原油的成熟度进行详细的划分,研究区甲基环己烷指数与环己烷指数综合分析原油母质特征,沉积环境。结果表明:研究区原油石蜡指数分布在0.58~0.75,正庚烷指数分布在8.70~14.33,研究区域原油成熟度主要在0.88%~1.01%范围内,整体上表现为成熟油。研究区原油甲基环己烷指数MCH分布在63.34%~72.41%、环己烷指数CH分布在46.24%~55.15%,研究区原油具有腐殖型母质的特征,沉积环境主要为浅湖相和沼泽相环境。Light hydrocarbon is one of the important substances in crude oil. The study on the geochemical characteristics of light hydrocarbons is beneficial to the exploration and development of oil and gas in China.In order to study the geochemical characteristics of light hydrocarbon from crude oil in the central tectonic zone of Xihu Sag, the maturity of crude oil was divided by heptane and isoheptane. The methylcyclohexane index and cyclohexane index were used to analyze crude oil characteristics and deposition environment. The results show that the distribution index of crude oil paraffin in the study area is 0.58 - 0.75, the distribution of n-heptane is 8.70 - 14.33, the maturity of crude oil is 0.88% - 1.01%, and the whole is mature. The distribution of methylene cyclohexane MCH in the study area is 63.34% - 72.41%, and the distribution of cyclohexane index CH is 46.24% - 55.15%. The crude oil in the study area has the characteristics of humic parent material. The sedimentary environment is mainly shallow lake facies and swamp environment.

关 键 词：西湖凹陷 轻烃 甲基环己烷 原油成熟度 

分 类 号：TE34[石油与天然气工程—油气田开发工程]