【摘要】 印度国家天然气水合物01航次NGHP01-17井测井资料表明,安达曼海的薄层火山灰中存在天然气水合物,饱和度高达孔隙空间的20%。BSR上厚度为20m地层的水合物饱和度约为10%。利用稀疏脉冲反演了含水合物层的声波阻抗剖面,基于测井获得声波阻抗与饱和水孔隙度之间的关系,计算了地层饱和水孔隙度剖面,结合阿尔奇公式估算了地震剖面的水合物饱和度。从地震数据计算的天然气水合物饱和度占孔隙空间的6%～15%,局部饱和度高达20%,在空间分布上具有不均匀性。更多还原

【Abstract】 Logging data from the site 17 of the National Gas Hydrate Program 01(NGHP-01) expedition showed the occurrence of gas hydrate in the volcanic ash sediments of the Andaman Sea,of which the gas hydrate saturation reaches as high as 20% of the pore space,and the gas hydrate saturation in the top 20 m of the BSR is about 10% of the pore space.Acoustic impedance was calculated from the seismic profile using constrained sparse inversion.The water-filled porosity profile was calculated from the cross plot of acoustic impedance and density porosity at the site 17.Gas hydrate saturation was about 6-15% of the pore space calculated from acoustic impedance using Archie equation in the Andaman Sea.The distribution of gas hydrate is heterogeneous in space and the maximum value of saturation is up to 20% of the pore space.更多还原