【摘要】 首先,根据地震反射剖面的似海底反射特征、深海钻探计划(DSDP)和大洋钻探计划(ODP)钻孔沉积物的高甲烷含量、高有机碳含量以及孔隙水盐度、氯离子浓度和硫酸根离子浓度异常等地球物理和地球化学证据推测,南极陆缘有7个潜在的天然气水合物分布区,它们分别为南设得兰陆缘、南极半岛的太平洋陆缘、罗斯海陆缘、威尔克斯地陆缘、普林斯湾陆缘、里瑟-拉森海陆缘和南奥克尼群岛东南陆缘等。其次,从气源条件、沉积条件、热流及温压条件和地质构造条件等对南极陆缘天然气水合物的成藏条件进行了分析,认为该陆缘具备天然气水合物形成和赋存的有利地质条件。最后,对南极陆缘天然气水合物的资源前景进行了探讨,认为其资源量非常可观。更多还原

【Abstract】 Gas hydrates can accumulate in the Antarctic margins,whic could be inferred from geophysical and geochemical evidences,such as Bottom Simulating Reflector(BSR) on the seismic profile,high concentrations of methane and organic carbon and abnormal varieties of salinity,chlorinity and sulfate of pore waters in boring sediment samples of DSDP and ODP sites. Seven potential distributing areas of gas hydrates are South Shetland continental margin,Pacific margin of the Antarctic Peninsula,Ross Sea continental margin,Wilkes Land continental margin,Prydz Bay continental margin,Riiser-Larsen Sea continental margin and the southeast margin of the South Orkney Islands. Antarctic margins have advantageous geological conditions for the formation and accumulation of gas hydrates according to analysis of the reservoir conditions,including gas source,sedimentation,heat flow,temperature,pressure and tectonic conditions etc. It is shown that there is considerable resource potential of gas hydrate in the Antarctic margins.更多还原