Relationship of hydrocarbon and source-rock in Nos.3-5 tectonic belts of the Lenghu area,northern Qaidam Basin

作     者：WANG Chao-yong ZHANG Ming YIN Cheng-ming JIANG Bo BAO Yuan 

作者机构：School of Resources and Earth Science China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China Qinghai Exploration and Petroleum Research Institute Sinopec Dunhuang Gansu 736202 China 

出 版 物：《Mining Science and Technology》 (矿业科学技术（英文版）)

年 卷 期：2009年第19卷第6期

页      面：796-799页

核心收录：

学科分类：081803[工学-地质工程] 0808[工学-电气工程] 080803[工学-高电压与绝缘技术] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：Project 2009011 supported by the Resource Exploration Projects of the Ministry of Land and Resources of China the State Key Laboratory of Petroleum Resource and Prospecting of China Petroleum University (Beijing) 

主　　题：Qaidam Basin Jurassic carbon isotope sapropel humus 

摘      要：Based on analyses of the components of crude oil hydrocarbons and carbon isotopes,the content of normal alkane decreased from 49.00% to 20.10% when moving from the No.3 to No.5 tectonic belt of the Lenghu area of the Qaidam Basin,while cycloalkanes increased from 30.00% to 52.20% and aromatic and branch chain alkanes increased gradually as well. The maturity of sterane in crude oil is higher than that of its source-rock,which shows that the hydrocarbons were generated from a deep source-rock of high maturity around the tectonic belts of the Lenghu area. The analysis of the characteristics of carbon isotopes also shows that these isotopes of hydrocarbon compounds in the No.4 and No.5 tectonic belt are apparently heavier than those in the No.3 belt. The results of our research show that the hydrocarbons in the No.3 tectonic belt are mainly from a relatively rich sapropelic substance,while the hydrocarbons in the No.4 and No.5 tectonic belt originated mainly from organic matter of a relatively rich humic type substance.