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现代地质 ›› 2008, Vol. 22 ›› Issue (3): 415-419.

• 岩石学与地球化学 • 上一篇    下一篇

天然气水合物发现区和潜在区气源成因

龚建明1,张敏2,陈建文1,李谨3,陈立英1,成海燕1,4   

  1. 1青岛海洋地质研究所 海洋油气资源与环境地质重点实验室,山东 青岛 266071;2长江大学 地球化学系,湖北 荆州 434023;3中国石油勘探开发研究院 廊坊分院,河北 廊坊 065007;4中国海洋大学 海洋地球科学学院,山东 青岛 266003
  • 收稿日期:2008-01-31 修回日期:2008-05-10 出版日期:2008-03-20 发布日期:2008-03-20
  • 作者简介:龚建明,男,研究员,1964年出生,石油地质学专业,主要从事海洋油气与天然气水合物研究工作。
  • 基金资助:

    国家自然科学基金项目(40576059);国土资源部海洋油气资源与环境地质重点实验室项目(MRE200805)

Gas Sources Genesis in the Gas Hydrate Discoveries and Potential Areas

GONG Jian-ming1, ZHANG Min2, CHEN Jian-wen1, LI Jin3, CHEN Li-ying1,CHENG Hai-yan1,4   

  1. 1Key Laboratory of Marine Hydrocarbon Resource and Environmental Geology,Qingdao Institute of Marine Geology, Qingdao,Shangdong266071, China;2Geochemical Department,Yangtze University, Jingzhou, Hubei 434023, China; 3. Langfang Branch,Research Instituteof Petroleum Exploration & Development, PetroChina, Langfang, Hebei  065007, China;4College of Marine Geoscience,Ocean University of China, Qingdao,Shandong 266003, China
  • Received:2008-01-31 Revised:2008-05-10 Online:2008-03-20 Published:2008-03-20

摘要:

为探讨天然气水合物发现区的气源成因,对ODP 204航次4个站位58个沉积物样品进行5个温度点的生气量模拟实验,对各温度点产生的气体进行同位素测定。测试结果显示,在低温阶段(25 ℃、35 ℃、45 ℃),甲烷的δ13C明显偏大,一般大于-40‰,显示出热解成因气的特征;而高温阶段(55 ℃)甲烷的δ13C为-75.5‰,显示出明显的生物成因气的特征。结合东沙海域天然气水合物潜在区气源成因的讨论,可以得出如下结论:天然气水合物的气源成因受控因素多,需要综合多种指标进行判别。

关键词: 气源成因, δ13C, 烃类气体, 模拟, 东沙海域, ODP 204航次

Abstract:

In order to study the gas sources genesis in gas hydrate discoveries and potential areas, gas-generating amounts of 58 sediment samples from 4 sites of ODP 204 Expedition have been modeled by 5 temperature points, gas chromatography is used to test the isotope from different temperature points. The test results show that methane carbon isotope(δ13C)is evidently heavier among the lower temperature modeling points, commonly larger than -40‰, displaying the isotopic feature of thermogenic gas; while the lighter δ13Ccould reach to -75.5‰ when the modeling temperature is higher than 55℃,showing the isotopic feature of biogenic gas. Integrated with the discussion of gas genesis of Dongsha potential area, the conclusions could be drawn as follows, gas genesis could be controlled by many factors, and correct gas genesis could be got through the combination of other factors besides the methane carbon isotope. 

Key words: gas-genesis, δ13C, hydrocarbon gas, modeling, Dongsha area, ODP 204 Expedition

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