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现代地质 ›› 2005, Vol. 19 ›› Issue (1): 21-25.

• 天然气水合物沉积学特征 • 上一篇    下一篇

ODP204航次天然气水合物的可能有利储层——浊积层

龚建明1,2. 张莉3. 陈建文1,2. Young-Joo LEE4. 王红霞1,2. 闫桂京1   

  1. 1中国海洋大学 海洋地球科学学院，山东 青岛266003；
    2青岛海洋地质研究所，山东 青岛266071；
    3广州海洋地质调查局，广东 广州510075；
    4Korea Institute of Geoscience & Mineral  Resources, 30 Gajung-dong Yusung-gu，Daejon 305-350，Korea
  • 收稿日期:2004-10-18 修回日期:2004-12-15 出版日期:2005-01-20 发布日期:2005-01-20
  • 作者简介:龚建明，男，研究员，博士研究生，1964年出生，石油地质学专业，主要从事石油地质与天然气水合物勘探的研究工作。
  • 基金资助:

    国家重点基础研究发展规划项目(G20000467)

A Favorable Reservoir for Gas Hydrate Found in ODP Leg 204: Turbidite

GONG Jian ming1,2,  ZHANG Li3, CHEN Jian wen1,2,  Young Joo LEE4   

  1. 1College of Marine Geology,Ocean University of China, Qingdao,Shandong266003, China；
    2Qingdao Institute of Marine Geology, Qingdao，Shandong266071, China；
    3Guangzhou Marine Geological Survey, Guangzhou，Guangdong510075, China；
    4    Korea Institute of Geoscience & Mineral Resources, 30 Gajung-dong, Yusung-gu, Daejon, 305-350, Korea
  • Received:2004-10-18 Revised:2004-12-15 Online:2005-01-20 Published:2005-01-20

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摘要：

为了解岩性在天然气水合物分布中的作用, 利用岩矿鉴定、扫描电镜和能谱法对ODP 204航次的4个站位10个钻孔共计115个沉积物样品进行分析，发现沉积物中矿物成分基本相近，以粘土矿物为主，含少量以石英为主的陆源碎屑。样品中含有丰富的硅藻和有孔虫等微体化石，可形成硅藻粘土—硅藻土、有孔虫硅藻土或凝灰质硅质生物粘土。石英碎屑大多呈棱角状,粒径小、含量少,同时, 样品中可见透镜体、团块或旋涡状层状结构以及杂乱堆积的斑杂构造。上述特征表明沉积物为含有大量深海或半深海的浊流沉积物或其夹层。由于钻井岩心中有相当部分的天然气水合物样品分布在上述沉积物中,推断这些浊流沉积物很可能是ODP 204航次天然气水合物的有利储层。

关键词: 岩矿鉴定, 电镜扫描, 浊流沉积物, 天然气水合物, ODP 204航次

Abstract:

Methods of rock-mineral identification, scanning electron microscopy and energy spectrum are used to analyze 115 sediment samples from 10 drilling holes at four sites of ODP Leg 204 in order to make clear the relation between lithology and gas hydrate distribution. We find that the samples are nearly similar to each other in mineral compositions, mainly consisting of clay with minor terrestrial clasts dominated by quartz. The samples are rich in diatom and microfossils (such as foraminifers) and take the forms of diatomaceous clay, foraminiferal diatomaceous clay or tuffaceous and siliceous organic clay. Quartz clasts are mostly angular, and small both in grain size and quantity. The samples show lenticular, crumb and whirl-lamination structures, and mottled texture typical of chaotic accumulation, suggesting deep-sea or semi-pelagic turbidite or interbeds. Since drilling-proved gas hydrate samples are distributed in the turbidite, such sediments are considered as a favorable reservoir for gas hydrate of ODP Leg 204.

Key words: rock-mineral identification, scanning electron microscopy, turbidite, gas hydrate, ODP Leg 204

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