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非活动大陆边缘的天然气水合物及其成藏过程述评
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引用本文:张光学,祝有海,徐华宁.2003.非活动大陆边缘的天然气水合物及其成藏过程述评[J].地质论评,49(2):181-186,[DOI]:.
.2003.Gas Hydrate on the Passive Continental Margin and Its Pool-formation Process[J].Geological Review,49(2):181-186.
DOI:
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张光学  祝有海  徐华宁
[1]国土资源部广州海洋地质调查局510760 [2]中国地质科学院矿产资源研究所,北京100037
基金项目:国家自然科学基金(编号49972047)
中文摘要:非活动陆缘是板块活动相对较弱的地区,也是水合物发育的有利地区。通过对世界各地非活动陆缘地区水合物富集情况的系统分析,发现断褶组合构造、底辟构造以及“麻坑”地貌(Pockmark)与水合物的关系密切。尽管模拟海底反射层(Bottom Simulating Reflector,简称BSR,下同)是最重要的水合物识别标志,但水合物与BSR之间并不存在严格的一一对应关系。非活动陆缘具有丰富的烃类物质来源和适宜的温压条件,而断裂-褶皱组合构造、垒堑式构造和底辟构造等则为烃类气体的运移、富集和成藏提供了有利的构造环境,便于最终形成水合物。非活动陆缘的深水区往往发育有多期叠合盆地,因其物源、温压、构造和沉积条件的内在关联性,常常形成深部石油、中部天然气、浅部水合物的“三位一体”烃类能源结构模式。
中文关键词:非活动大陆边缘 天然气水合物 ESR 成藏过程 海底反射层 沉积条件
 
Gas Hydrate on the Passive Continental Margin and Its Pool-formation Process
ZHANG Guangxue,ZHU Youhai,XU Huaning1) Guangzhou Marine Geological Survey,Ministry of Land and Resources,Guangzhou,510760 2) Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing,100037
Abstract:The passive continental margin is a comparatively weak region of plate tectonic movement, but it is a favorable region for gas hydrate. Up to now, more than two thirds of marine gas hydrates are distributed in passive continental margins. Comprehensive study of gas hydrate accumulations in passive continental margins shows that gas hydrate is closely related to fault-fold combination structures, diapiric structures and pockmarks. The bottom simulating reflector (BSR) is the most important indicator for identifying gas hydrates, but it is not a feasible indicator since there is no strict corresponding relationship between gas hydrate and the BSR. There are plentiful gas resources and suitable temperature and pressure conditions for gas hydrate on passive continental margins. Furthermore, fault-fold structures, horst-graben structures and diapiric structures provide favorable tectonic environments for the migration, enrichment and pool-formation of hydrocarbon gases, which will ultimately form gas hydrates in these regions. Multiple superimposed basins are frequently developed in deep-water regions of passive continental margins, and usually a composite hydrocarbon accumulation model is formed in these regions, which is characterized by deep oil, middle gas and shallow gas hydrate because of their internal links in regard to hydrocarbon origin, temperature, pressure, structure and sedimentary conditions.
keywords:passive continental margin,gas hydrate,bottom simulating reflector,pool-formation process,
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