PROGRESS IN STUDY OF DEEP-WATER DEPOSITIONAL SYSTEMS IN THE NORTHERN CONTINENTAL SLOPE OF THE SOUTH CHINA SEA AND ITS IMPLICATIONS FOR GAS HYDRATE RESEARCH
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摘要: 近年海域天然气水合物勘探和研究表明,水合物的形成、聚集和分布往往与浅层深水沉积体之间存在紧密联系,随着深水观测和钻探技术的提高以及高分辨三维地震资料的使用,深水沉积体系研究进入了一个快速发展的阶段,在水合物远景区域内对浅层深水沉积体进行精细刻画已成为海域天然气水合物勘探的热点和难点。通过分析国内外深水沉积体系研究现状,从浅层深水沉积体与海域天然气水合物的关系入手,对现有研究方法和手段、深水沉积体的发展趋势进行总结和分析,结合南海北部陆坡天然气水合物勘探研究现状和存在问题,提出应该在浅层深水沉积体发育类型和沉积背景、浅层深水沉积体的内部构成和空间分布、以及浅层深水沉积体与水合物耦合关系等三方面加强研究,以期为我国海域天然气水合物勘探和研究提供参考。Abstract: Recent researches of marine gas hydrate indicate that the formation, migration and distribution of the gas hydrate have close relationship with deep-water depositional systems. With the development of deep-water observations and drilling technology and the wide use of high-resolution 3D seismic data, the studies on deep-water depositional systems have made great progress. Consequently, the analysis and description of the deep-water deposits in the shallow layers in a promising target area have become a hot and difficult question in gas hydrate exploration. This paper aims to provide a systematic study on the progress of the deep-water depositional system from following aspects:source to sink system, internal architecture description, and complex controlling factors. In combination with the current situation and problems of gas hydrate exploration on the northern continental slope of the South China Sea, some suggestions were proposed, including the analysis of deep-water depositional types and background, the description of the internal architecture and evolution of the deep-water deposits in the shallow layers, and the relationship between the deep-water deposits and gas hydrate in the shallow layers, in order to provide a reference for research and exploration of gas hydrate in the region.
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