摘要
用地层剖面仪加一条拖曳水听器阵组成的海底地层测量系统采集海底地层广角回波数据，对广角回波数据进行共深度点叠加得到的叠加剖面可用于地质解释。当海底地层声速有横向变化时，由于波的折射效应的影响，叠加剖面不能真实反映海底下地层构造的情况，应用于地质解释很可能会导致错误的结果。在已知海底地层声速的情况下，用声波方程Ｋｉｒｃｈｈｏｆｆ积分方法对叠加数据进行正反向两次波场延拓，可消除上伏地层声速横向变化引起下伏地层回波波场的畸变，获得更精确反映海底下地层构造的声波图像。
Wide-angle echo data of submarine sedimentary beds are collected by a system composedof a seismic profiler and a hydrophone streamer towed behind the profiler. Usually the wide-angle echodata ale processed with common-depth- point stack method to obtain the stached section for geologic alinterpretation. When the acoustic velocity of the sedimentary layers has a lateral variation, the stackecsection does not represent the real structure of sedimentary layers. Based on this stacked section, wewould probably draw a false conclusion. In case of knowing the acoustic velocity of sedimentary bedswe may remove the distortion caused by acoustic velocity lateral variation from the stacked section withacoustic wave equation Kirchhoff integration which continues the wavefields in downgoing and upgoingdirections respectively. Thus the accurate image of the structure of submarine sedimentary layers isobtained
出处
《声学学报》
EI
CSCD
北大核心
1996年第3期272-279,共8页
Acta Acustica
