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题名: Natural gas geochemistry of low evolutionary stage of medium- and small-sized basins in Yunnan Province, southwestern China
作者: Xu, YC ; Shen, P ; Zhen, JJ ; Liu, WH ; Guan, P
刊名: CHINESE SCIENCE BULLETIN
出版日期: 1999
卷号: 44, 期号:18, 页码:1709-1712
学科分类: Science & Technology - Other Topics
英文摘要: The biogenic gas and premature-low mature associated gases in some medium and small-sized basins of Yannan Province, such as Luliang, Yanglin, Baoshan and Jinggu basins, have beed researched. The results show that the biogenic-gas consists mainly of methane which is more than 99% in gasous hydrocarbons and of lighter carbon isotopic composition with delta(13)C(1) values from - 60.0 parts per thousand to - 75.4 parts per thousand. The methane carbon isotopic compositions in the Baoshan Basin is relatively heavy (delta(13)C(1), - 60 parts per thousand- - 65 parts per thousand), but those in Luliang and Yanglin basins are lighter (delta(13)C(1), less than - 70 parts per thousand), which implies that the gas field of the Baoshan Basin formed earlier than the others. In the Jinggu Basin, where crude oil is premature-lower mature, the natural gas of associated oil relatively wet and the relative content of methane about 58%-95% in gasous hydrocarbons. Constituently the gas composition is much similar to associated one, but the methane carbon isotopic compositions from - 53.8 parts per thousand to - 57.8 parts per thousand are obviously richer in C-12 than those of general oil fields and similarly characterize the biothermocatalytic transitional zone gas. Their ethane carbon isotopic compositions from - 34.6 parts per thousand to 29.0 parts per thousand show that they may be derived from type I or II source rock. But for the associated gas from lower evolutionary stage, the heavier ethane carbon isotopic composition as well as the reversed order among the carbon isotopic composition of ethane, propylane and butane also implies that some gases from the type III organic matter are mixed. The delta(13)C(CO2) of the samples essentially less than - 10 parts per thousand may be generated from organic matter.
收录类别: SCI
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.lig.ac.cn/handle/132962/2303
Appears in Collections:中国科学院兰州地质研究所_期刊论文

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Xu, YC; Shen, P; Zhen, JJ; Liu, WH; Guan, P.Natural gas geochemistry of low evolutionary stage of medium- and small-sized basins in Yunnan Province, southwestern China,CHINESE SCIENCE BULLETIN,1999,44(18):1709-1712
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