Geochemistry and origin of natural gas in the eastern Junggar Basin,NW China

摘要：

　　The eastern Junggar Basin in NW China is an important region for natural gas exploration with the giant Kelameili Gas Field having been discovered.However,the origin of gas in the region is unclear,which limits the understanding of gas formation and accumulation,as well as the planning of exploration strategies.Here,we address the origin of gas in this region through a comprehensive investigation of gas geochemistry in the context of geological setting,including gas chemical compositions,carbon isotopes and light hydrocarbons and biomarkers of retrograde condensates.Results show that four main types of natural gases were identified:(1)highly mature to post-mature humic-type gas sourced from Carboniferous rocks with Type Ⅲ kerogen,(2)mature to highly mature humic-type gas sourced from Permian rocks with Type Ⅲ kerogen,(3)mature to highly mature sapropelic-type gas sourced from Permian rocks with Type Ⅰ-Ⅱ kerogen,and(4)microbial gas sourced from Permian rocks with Type Ⅱ-Ⅲ kerogen.These gases vary significantly in geochemistry,and thus can be easily identified.The distribution of the gases follows the “source-controlled” principle in that it is controlled by the distribution and maturity of hydrocarbon source rocks.As such,the gases sourced from the Carboniferous and Permian rocks are the most viable exploration targets,with the areas in and surrounding the hydrocarbon-generation centers being favorable for exploration.These results also provide guidance to natural gas exploration and research in other basins with similar geological settings.

关键词： Natural gas geochemistry Humic-type gas Sapropelic-type gas Carboniferous Permian Junggar basin

作者: Ping”an Sun Yuce Wang Kun Leng Hui Li Wanyun Ma Jian Cao

作者单位: Key Laboratory of Karst Dynamics,MLR/GZAR,Institute of Karst Geology,CAGS,Guilin,541004,China;State State Key Laboratory for Mineral Deposits Research,Department of Earth Sciences,Nanjing University,N Research Institute of Experiment and Testing,PetroChina Xinjiang Oilfield Company,Karamay,834000,Chi Research Institute of Petroleum Exploration and Development,PetroChina Xinjiang Oilfield Company,Kar

会议类型: 国内会议

会议名称: 国土资源部广西岩溶动力学重点实验室和国土资源部岩溶生态系统与石漠化治理重点实验室2016年度学术委员会会议

会议地点: 广西桂林

会议语种:英文

页码: 240-251

在线出版日期: 2016-12-02（万方平台首次上网日期，不代表论文的发表时间）