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现代地质 ›› 2018, Vol. 32 ›› Issue (05): 1003-1011.DOI: 10.19657/j.geoscience.1000-8527.2018.05.13

• 天然气水合物研究 • 上一篇    下一篇

漠河盆地多年冻土区天然气水合物地球化学调查及远景评价

张富贵1,2(), 唐瑞玲1(), 杨志斌1,2, 朱敬华3, 周亚龙1,2, 孙忠军1,2   

  1. 1.中国地质科学院 地球物理地球化学勘查研究所,河北 廊坊 065000
    2.中国地质科学院 地球表层碳-汞地球化学循环重点实验室,河北 廊坊 065000
    3.临沂大学,山东 临沂 276400
  • 收稿日期:2018-01-10 修回日期:2018-07-10 出版日期:2018-10-10 发布日期:2018-11-04
  • 通讯作者: 唐瑞玲,女,工程师,1985年出生,地球化学专业,主要从事分析测试的工作。Email:tangruiling@igge.cn
  • 作者简介:张富贵,男,高级工程师,1980年出生,沉积学专业,主要从事油气和天然气水合物研究与勘查工作。Email:zhangfugui@igge.cn
  • 基金资助:
    中国地质调查局地质调查项目(DD20160224);中央级公益性科研院所基本科研业务费专项基金项目(AS2016Y01)

Geochemical Investigation and Prospective Evaluation of Natural Gas Hydrates in the Permafrost of Mohe Basin

ZHANG Fugui1,2(), TANG Ruiling1(), YANG Zhibin1,2, ZHU Jinghua3, ZHOU Yalong1,2, SUN Zhongjun1,2   

  1. 1. Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang, Hebei 065000,China
    2. Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth’s Critical Zone, Chinese Academy of Geological Sciences, Langfang, Hebei 065000,China
    3. Linyi University, Linyi, Shandong 276400,China
  • Received:2018-01-10 Revised:2018-07-10 Online:2018-10-10 Published:2018-11-04

摘要:

漠河盆地是我国冻土发育的主要地区之一,发育良好的天然气水合物成藏系统,具有天然气水合物形成的良好条件。为了圈定天然气水合物远景区,识别油气聚集体,判别天然气水合物成因,在漠河盆地冻土较发育地区开展了1∶5万天然气水合物地球化学资源调查。结果表明:(1)在森林沼泽景观区,顶空气和荧光光谱指标是天然气水合物勘查的主要指标,借鉴青海木里冻土区天然气水合物地球化学勘查成功的经验,结合AMT、地质等资料分析,元宝山凹陷是天然气水合物较为有利的远景区;(2)岩心样品甲烷碳同位素分析显示,烃类气体分异明显,浅层烃类气体基本为生物气,深部烃类气源主要为混合成因气,个别解吸气为微生物气和热解气;(3)试验性应用了分形-GIS技术,可以细致可靠地进行异常区范围划定,消除干扰因素,有效地圈定水合物远景区。

关键词: 天然气水合物, 地球化学调查, 多年冻土区, 漠河盆地, 远景评价

Abstract:

The Mohe basin is a major permafrost region in China.Gas hydrate reservoir system is well deve-loped in the basin, and the basin shows good accumulation conditions for gas hydrates. The 1∶50k scale regional gas hydrate geochemical survey was conducted in the Mohe basin to delineate prospecting gas hydrate target areas, and to recognize oil and gas traps and identify the hydrocarbon source. Our results show that: (1) In the forest bog region, headspace gas and fluorescence spectra are the main indices of gas hydrate exploration. Considering the AMT and geology materials, and the previous gas hydrate geochemical work in the Muli permafrost of Qinghai, we consider the Yuanbao depression as the gas hydrate target. (2) Methane carbon isotope analysis on core samples shows that the primary hydrocarbon gas is multi-genetic, and only a few adsorbed gases are from bacterial and hydrocarbon pyrolysis. (3) Multiple classification-GIS technique employed in this study can exclude the interference factors and precisely delineate the boundary of geochemical anomalies, and can thus be applied in the geochemical exploration of gas hydrates.

Key words: natural gas hydrate, geochemical investigation, permafrost area, Mohe basin, prospective evaluation

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