南沙海域天然气水合物地震特征

SEISMIC CHARACTERISTICS OF GAS HYDRATE IN THE NANSHA WATERS

南沙海域水深为 2 0 0～ 2 5 0 0m ,其中大于 5 0 0m的水域约 5 0万km2 ,该区大部分区域发育沉积盆地 ,构造类型多样 ,具有形成天然气水合物的气源、温度及压力条件。根据地质及地球物理调查资料 ,分析了南沙海域天然气水合物成藏的地质条件及地球物理标志特征 ,认为南沙海域具备形成天然气水合物矿藏的条件 。

The water depth varies from 200 to 2 500 m in the Nansha Waters where deep water (>500m) area amounts to 500 000 km^(2 ). It is largely covered by sedimentary basins with various structure features, prone to the accumulation of organic material. The deep water environment is suitable to the conservation of gas hydrate considering the temperature and pressure conditions. Over several sites, We have recognized BSR by interpreting seismic data. Regional geology analysis shows that Nansha Waters area prospects well in gas hydrate,especially in the localities as Nansha Trough and deep water basins of the central waters.