论文部分内容阅读
Chirp浅剖图像可以显示东沙群岛西南海域存在泥火山.通过基于Chirp浅剖记录数据的反演方法研究,定量地分析泥火山区海底物性参数.首先由Chirp浅剖记录的反射振幅计算了海底反射系数,结果表明泥火山区的反射变化很大(0.1~0.8).对于海底弱反射(<0.45)区域,用Schock-Stoll模型以及物理参数间的经验公式反演海底浅表层物理性质参数(速度、密度、孔隙度等参数);对于海底强反射(>0.45)区域,用Gardner经验公式反演海底浅表层物理性质参数.反演结果表明研究区海底物性变化大,声速最高达5 237m/s,密度最大为2.673g/cm~3.反演的物性参数与实验室测量值吻合度较高.Chirp浅剖数据反演是一种有效可行的遥测海底声学参数方法.
The Chirp image shows the existence of mud volcanoes in the southwest of Dongsha archipelago. The seafloor physical parameters of mud volcano area are quantitatively analyzed by the inversion method based on the Chirp log data. At first, the seabed reflection coefficient is calculated from the reflection amplitude recorded by Chirp, The results show that the reflection in the mud volcano varies greatly (from 0.1 to 0.8). For the weak reflection (<0.45) in the seabed, the physical properties parameters of the shallow sea surface (such as velocity, density, Porosity and other parameters). For the strong reflection (> 0.45) in the seafloor, the Gardner empirical formula is used to inverse the physical properties of the seafloor shallow sea surface. The inversion results show that the physical properties of the seafloor vary greatly in the study area with a maximum sound velocity of 5 237 m / Is 2.673g / cm ~ 3. The inversion of physical parameters is in good agreement with the laboratory measurements.The inversion of Chirp shallow profile data is an effective and feasible method for telemetric submarine acoustic parameters.