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现代地质 ›› 2010, Vol. 24 ›› Issue (3): 581-588.

• 天然气水合物专辑:地球化学 • 上一篇    下一篇

青海祁连山冻土区天然气水合物的气体成因研究

卢振权1,祝有海1,张永勤2,文怀军3,李永红3,贾志耀3,王平康1,李清海3   

  1. 1.中国地质科学院 矿产资源研究所,北京100037;   2.中国地质科学院 勘探技术研究所,河北 廊坊065000;
    3.青海煤炭地质105勘探队,青海 西宁810007
  • 出版日期:2010-06-21 发布日期:2010-08-17
  • 作者简介:卢振权,男,研究员,1972年出生,海洋地质与地球化学专业,主要从事天然气水合物与油气的地质地球化学勘查研究。Email: luzhq@vip.sina.com。
  • 基金资助:

    中国地质调查局地质大调查项目(1212010818055);国家重点基础研究发展计划项目(2009CB219501)。

Study on Genesis of Gases from Gas Hydrate in the Qilian MountainPermafrost, Qinghai

 LU Zhen-Quan1, ZHU  YOU-Hai1, ZHANG  Yong-Qin2, WEN  Huai-Jun3   

  1. 1.Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing100037, China;
    2.Institute of Exploration Techniques, Chinese Academy of Geological Sciences, Langfang, Hebei065000, China;
    3.Qinghai No105 Coal Geological Exploration Team, Xining, Qinghai810007, China
  • Online:2010-06-21 Published:2010-08-17

摘要:

在祁连山冻土区发现天然气水合物之后,其气体成因或来源便成为一个重要的科学问题。开展了气体组成和同位素特征及δ13C1-1/n、 C1/(C2+C3)-δ13C1、δDCH413CCH4、( δ 13C213C3)-ln(C2/C3)、ln(C2/C3)-ln(C1/C2)等关系图解的综合研究,结果显示:祁连山冻土区天然气水合物的气体以轻烃为主,具湿气特征,其同位素表现为正碳同位素系列特征。研究区天然气水合物的气体为有机成因,且以热解成因为主,夹少量微生物成因(醋酸根发酵),其中,热解成因气主要与原油裂解气、原油伴生气有关,少部分与凝析油伴生气、煤成气、干酪根裂解气有关。这一分析结果可能意味着研究区天然气水合物的气体来源与油型气密切相关,而与煤型气关系不大。

关键词: 天然气水合物, 成因, 冻土, 祁连山, 青海

Abstract:

The genesis or origin of gases from gas hydrate becomes an important scientific issue after gas hydrate is discovered in the Qilian mountain permafrost, Qinghai. The composition and isotope of gases from gas hydrate and the relevant diagrams of δ13C1-1/n、 C1/(C2+C3)-δ13C1、δDCH413CCH4、( δ 13C213C3)-ln(C2/C3)、ln(C2/C3)-ln(C1/C2) are studied in this paper. Conclusions are drawn out: In the Qilian mountain permafrost, Qinghai, gases from gas hydrate are mainly composed of light hydrocarbons with features of wet gas; The isotopes are characteristic of normal carbon isotopic series. In the study area, gases from gas hydrate are organic and preferably of thermal genesis with secondarily of microbial genesis (acetate fermentation); Gases of thermal genesis are predominantly from crude oil cracking or in association with crude oil generation, and minor or trace of them are associated with condensate gases, coaltyped gases, kerogen cracking gases. This analytical result probably implies that gas source of gas hydrate is closely related to oiltyped gases rather than coaltyped gases in the study area.

Key words: gas hydrate, genesis, permafrost, Qilian mountain, Qinghai

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