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现代地质 ›› 2013, Vol. 27 ›› Issue (2): 405-412.

• 水合物勘探 • 上一篇    下一篇

羌塘盆地QK-1孔烃类气体分布特征与成因来源

杨开丽1，祝有海2，王平康2，黄霞2， 庞守吉2   

  1. 1中国地质科学院 矿产资源研究所，北京100037；2中国地质调查局 油气资源调查中心，北京100029
  • 收稿日期:2012-08-16 修回日期:2012-12-22 出版日期:2013-04-01 发布日期:2013-04-22
  • 通讯作者: 祝有海，男，研究员，1963年出生，矿床地质学专业，主要从事天然气水合物和海洋地质研究。
  • 作者简介:杨开丽，女，硕士研究生，1987年出生，矿物学、岩石学、矿床学专业，主要从事天然气水合物研究。 Email: yangkaili1987@126.com。
  • 基金资助:

    国家专项“天然气水合物资源勘查与试采工程”(GZHL20110308-01-07)。

Distribution Characteristics and Origin of Hydrocarbon Gas from the borehole QK-1 in the Qiangtang Basin, Qinghai-Tibetan Plateau

YANG Kai-li1，ZHU You-hai2，WANG Ping-kang2，HUANG Xia2，PANG Shou-ji2   

  1. 1Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing100037, China；
    2Oil and Gas Survey, China Geological Survey, Beijing100029, China
  • Received:2012-08-16 Revised:2012-12-22 Online:2013-04-01 Published:2013-04-22

PDF (PC)

902

被引次数

4

摘要：

青藏高原冻土区面积约150×104 km2，是中国最大的冻土区，具备良好的天然气水合物形成条件和找矿前景，而羌塘盆地是形成条件和找矿前景最好的地区。南羌塘盆地毕洛错地区QK-1科学钻探试验井顶空气样品的烃类气体组分和碳同位素分析测试结果表明，其烃类气体组分复杂，CH4含量为3.0×10-6~4 526.8×10-6，平均为209.0×10-6；δ13C1值为-55.9‰~-37.8‰，平均为-43.2‰，C1/(C2+C3)值小于10，显示出明显的热解气特征。结合钻探区的地质背景和岩性特征，推断QK-1孔烃类气体可能来源于深部迁移上来的热解气，浅部可能有生物成因气的混入。

关键词: 羌塘盆地, 烃类气体, 气体成因, 分布特征, 天然气水合物

Abstract:

The Qinghai-Tibetan Plateau is the largest permafrost in China with an area of 150×104 km2, which is favorable for the formation and accumulation of natural gas hydrate, and the Qiangtang Basin will be the best target with a good prospect for natural gas hydrate reservoirs. The hydrocarbon gas composition and carbon isotope of the headspace gas samples from the borehole QK-1, one of the scientific drilling holes of gas hydrate in the Biluocuo area of the southern Qiangtang Basin, were determined and analyzed. The results indicate the hydrocarbon gas composition is complex, and the methane concentrations range from 3.0×10-6 to 4,526.8×10-6 with the average being 209.0×10-6. The δ13C values of methane range from -55.9‰ to -37.8‰ with the average being -43.2‰, and the values of C1/(C2+C3) are lower than 10, obviously suggesting thermogenic gas characteristics. According to the geological background and lithologic characteristics of the drilling area, it is estimated that the hydrocarbon gas comes from the deeper thermogenic gas which has migrated upward from the deep place, and may be mixed with biogenic gas in the shallow.

Key words: Qiangtang Basin, hydrocarbon gas, gas origin, distribution characteristic, natural gas hydrate

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