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经过对“探宝号”调查船在2001年8月在南海东北部陆坡及台湾南部恒春海脊海域采集的多道地震剖面资料进行的地震反射波数据分析、研究和解释,结果表明:(1)南海东北部陆坡段区域和台湾南部恒春海脊海域地震剖面上均显示有被作为天然气水合物存在标志的BSR,但两区域构造成因、形式和相关地质环境的不同造成了此两处的天然气水合物成因及过程的不同。(2)南海东北部陆坡区域的水合物形成与该区广泛发育的断裂带、滑塌构造体及其所形成的压力场屏蔽环境有关,而台湾南部恒春海脊海域的天然气水合物的形成则与马尼拉海沟俯冲带相关的逆冲推覆构造、增生楔等及其所对应的海底流体疏导体系有关。(3)南海陆缘区域广泛发育有各种断裂带、滑塌构造体、泥底辟、俯冲带、增生楔等,且温压环境合适,是天然气水合物矿藏极有可能广泛分布的区域。
Through the analysis, research and interpretation of the seismic reflection data collected by the “Bao Po” survey ship from the multi-channel seismic data collected in August 2001 in the southeastern part of the South China Sea and the Hengchun ridge in the south of Taiwan, the results show that: (1) The BSRs that are identified as natural gas hydrate are shown on the seismic sections of the continental slope in the northeastern South China Sea and the Hengchun Sea Ridge in the south of Taiwan. However, due to the different causes, forms and geological environments of the two regions, The origin and process of gas hydrate. (2) The formation of hydrate in the slope region of the northeastern South China Sea is related to the extensively developed fault zone and slump structure in the area and the pressure field shielding environment formed by it. However, the formation of gas hydrate in the Hengchun ridge area in southern Taiwan Related to the subduction nappe structures, accretionary wedges and other seafloor drainage systems associated with the Manila trench subduction zone. (3) There are various fault zones, slip structures, mud diapirs, subduction zones and accretionary wedges widely developed in the continental margin area of the South China Sea. Due to the suitable temperature and pressure environment, the gas hydrate deposits in the South China Sea are highly likely to be widely distributed.