【摘要】 西沙海槽具有适合天然气水合物形成和赋存的地形地貌及地质条件 ,是中国海洋天然气水合物资源勘查的远景区。为配合中国首次天然气水合物资源的调查研究 ,在该区进行了海底表层沉积物甲烷、乙烷等气态烃快速现场测试。研究发现 ,海底沉积物随着埋深的增加气态烃含量具有增高的趋势 ;最佳取样深度应在埋深 1～ 4m处 ;海底沉积物甲烷高含量异常区域主要分布在B33周围、A0 9—A11周围、B17—A0 2周围和B0 1—B0 3周围等区域。西沙海槽北部陆坡比槽底及南部斜坡具有更好的甲烷异常显示。该研究成果为以后该区天然气水合物资源的重点勘查提供了科学依据更多还原

【Abstract】 Previous studies show that the temperature, pressure, topographical feature and geological condition in the Xisha trough are favorable for the formation and accumulation of gas hydrates. In concert with the first gas hydrate resources prospect in China, the rapid gaseous hydrocarbon test method is used to detect methane, ethane and other kinds of gaseous hydrocarbon in the submarine sediment in this region. The results reveal that methane content increases with the increase in depth of the sediment.The best depth of the sample should be 1-4 m under the sea bottom. Methane abnormal regions mainly distribute in B33, A09 A11, B17 A02 and B01 B03 regions. The methane content is higher in north slope of the Xisha trough than in the trough bottom and south slope of the trough. All these studies provide a scientific evidence for the gas hydrate exploration in the near future.更多还原