石油学报 ›› 2018, Vol. 39 ›› Issue (3): 266-277.DOI: 10.7623/syxb201803002

• 地质勘探 • 上一篇    下一篇

漠河盆地浅部气体特征及对天然气水合物形成的意义

赵省民1, 邓坚1, 饶竹2, 文志刚3, 毕彩芹1, 易立1, 陆程1, 刘晨2   

  1. 1. 中国地质调查局油气资源调查中心 北京 100083;
    2. 中国地质科学院国家地质实验测试中心 北京 100037;
    3. 长江大学资源与环境学院 湖北武汉 430100
  • 收稿日期:2017-09-28 修回日期:2018-02-18 出版日期:2018-03-25 发布日期:2018-04-10
  • 通讯作者: 赵省民,男,1964年8月生,1985年获山西矿业学院煤田地质专业学士学位,1997年获中国地质大学(北京)石油地质专业博士学位,现为中国地质调查局油气资源调查中心科技处副处长、研究员,主要从事石油地质和天然气水合物地质勘查及研究。Email:xxmmzh@163.com
  • 作者简介:赵省民,男,1964年8月生,1985年获山西矿业学院煤田地质专业学士学位,1997年获中国地质大学(北京)石油地质专业博士学位,现为中国地质调查局油气资源调查中心科技处副处长、研究员,主要从事石油地质和天然气水合物地质勘查及研究。Email:xxmmzh@163.com
  • 基金资助:

    国土资源部天然气水合物专项(GZHL20110317、GZH201400303)和"黔西川南及东北三江地区煤层气基础地质调查"项目(DD20160186)资助。

Shallow gas characteristics in Mohe Basin, Northeast China and its significance to gas hydrate formation

Zhao Xingmin1, Deng Jian1, Rao Zhu2, Wen Zhigang3, Bi Caiqin1, Yi Li1, Lu Cheng1, Liu Chen2   

  1. 1. Oil & Gas Survey Center, China Geological Survey, Beijing 100083, China;
    2. National Research Center for Geoanalysis, Chinese Academy of Geological Sciences, Beijing 100037, China;
    3. College of Resource and Environment, Yangtze University, Hubei Wuhan 430100, China
  • Received:2017-09-28 Revised:2018-02-18 Online:2018-03-25 Published:2018-04-10

摘要:

烃类气源是天然气水合物形成的关键因素之一,气源问题长期困扰着中国东北冻土带的天然气水合物勘探。通过对中国东北漠河盆地4口地质浅井数百个岩心气体样品测试数据的研究可以得出:漠河盆地浅部(地表以下约1 200 m以浅的范围)的烃类气体含量多为10~100 mL/L,个别超过100 mL/L。通常泥质类岩石、破碎带和盆地深部的含气量较高,含碳或碳质泥岩的含气量更高。漠河盆地冻土带浅部主要为生物气;中深部(深度为1 200~2 300 m)可能主要是混合气;深部(深度>2 300 m)应该有热解成因的常规天然气。浅部生物气为漠河冻土带天然气水合物形成的主要气源,这对中国东北地区乃至中国陆域天然气水合物的勘探具有重要意义。

关键词: 漠河盆地, 多年冻土, 生物气, 天然气水合物, 烃类气源

Abstract:

Hydrocarbon gas source is one of key factors for gas hydrate formation, and for long time is a puzzle during the gas hydrate exploration in the permafrost of Northeast China. In this study, hundreds of gas samples from the drilled cores of four wells in Mohe Basin were analyzed in detail, and it is obtained that the hydrocarbon gas content in the shallow part of Mohe Basin (above 1 200 m under subsurface)is in the range of 10-100 mL/L, and several individual contents exceed 100 mL/L. In general, the muddy rocks, fracture zones and deeper formations (>2 300 m)have high gas contents, while the carbon-bearing or carbonaceous mudstones have higher gas contents. The hydrocarbon gas in the shallow part of Mohe Permafrost is dominated by biogas; at the depth of 1 200-2 300 m, mixed gas could exist; conventional natural gas formed by pyrolysis shall occur in the deep formations. The shallow biogas is the main gas source for gas hydrate formation in the Mohe Permafrost, Northeast China, which has a great significance to guide the exploration of gas hydrate in the Northeast China and even the whole China land.

Key words: Mohe Basin, permafrost, biogas, gas hydrate, hydrocarbon gas source

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