【摘要】 地震方法是识别海洋天然气水合物的主要手段之一。根据实测的高分辨率多道地震资料,探讨南海北部神狐暗沙海区可能赋存的天然气水合物的地震识别特征,以及该方法在实际工作中的应用。地震反射特征反映神狐暗沙海区存在多处似海底反射(BSR)分布区,总面积约5970 km2.可分为S-BSR、W-BSR和I-BSR三类,以W-BSR为主。此外,地震剖面上还发现弱振幅或振幅空白带、极性反转及低速异常等指示标志。根据BSR及振幅空白带分布状况,估算该区含水合物层的厚度可能为10~264 m,具有较好的资源潜力。更多还原

【Abstract】 Seismic method is one of important means for research of marine gas hydrate.Based on the measured high resolution multi-trace seismic data,the seismic identification characteristics of potential gas hydrates and the practical application in Shenhu Shoal sea area in northern South China Sea are discussed.The seismic reflection characteristics indicate there are several bottom simulating reflection(BSR) distribution areas with an area of totaling about 5 970 km2,which can be divided into three types of S-BSR,W-BSR and I-BSR,dominated by W-BSR.Furthermore,other features such as weak or blanking amplitude,polarity inversion and low velocity anormaly are found on some seismic profiles.It is estimated from the distribution of BSR and blanking zones that the gas hydrates zone in this sea area is about 10~264 m in thickness,being of good resource potentials of gas hydrates.更多还原