| 中国近海天然气水合物找矿前景 |
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| 引用本文：.2001.The Prospecting for Gas Hydrate Offshore Chcina[J].Mineral Deposits,20(2):175~181 |
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| 基金项目:国家自然科学基金项目（批准号：49972047）、国家863项目（编号：820-探．5）和国土资源大调查项目（编号：DKD2002004） |
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| 中文摘要:天然气水合物是一种新型能源，在海底沉积物和陆上永久冻土带中均有广泛分布。西太平洋是全球三大天然气水合物成矿带之一，在其中已发现许多水合物矿床或矿点。中国近海，包括南海、东海和台湾东部海域，具备良好的天然气水合物成矿条件和找矿前景，并已在这些海域中发现了一系列的找矿标志。南海的西沙海槽、台湾西南陆坡和台西南盆地、笔架南盆地及其东缘增生楔、东沙群岛东南坡、南部陆坡区，东海的冲绳海槽和台湾东北部海域是中国近海最有利的天然气水合物找矿远景区。 |
| 中文关键词:天然气水合物 中国近海 成矿条件 找矿前景 |
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| The Prospecting for Gas Hydrate Offshore Chcina |
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| Abstract:Gas hydrate is ice-like solid, formed of a cage of water molecules surrounding a natural gas molecule (commonly of methane), under specific conditions of relative high pressure and low temperature. It has become the focus of international interest over the past few years because of its, abundance and its potential importance as (1) an energy resource, (2) a controlling factor of global climatic change, and (3) a trigger of seafloor instability. More than a dozen of gas hydrates have been found in such areas of the Western Pacific as the Bering Sea, the Okhotsk Sea, the Japan Sea, and the Nankai Trough. The offshore China area, comprised of the South China Sea, the East China Sea and offshore eastern Taiwan, is located in the central part of the Western Pacific and has favorable geological setting, gas sources, temperature and pressure for the formation of gas hydrate. Recent multidisciplinary analyses of geological, geophysical and geochemical data show that gas hydrate probably occurs in offshore China. For example, some bottom-simulating reflectors (BSR) as well as blanking zones were identified in the South China Sea and East China Sea. High temperature anomalies above the sea surface were discovered offshore China by satellite thermal infrared scanning, which are probably related to gas hydrate or gas seeps. High methane concentration of sediments and low chlorinity anomalies in interstitial water, which are regarded as indicators of gas hydrate, were also found from Site 1146, ODP Leg184. Moreover, the hydrocarbon anomalies and radioactive anomalies of shallow sediments were recognized in the South China Sea, In general, the most favorable areas of gas hydrate offshore China include the north and south slopes of the South China Sea, the Okinawa Trough and its two blanks in the East China Sea, with the potential areas being the western slope of the South China Sea and offshore eastern Taiwan. |
| keywords:gas hydrate, offshore China, condition of mineralization, potential area |
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