二维粘弹介质中完全波场正演模拟
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摘要
本文绘出一种实现二维粘滞介质完全波场模型计算的方法。该方法的独到之处在于把传播时间分解成了水平时间分量和垂直时间分量两部分，在线源入射的基础上，无需繁杂的射线追踪，只考虑入射角随偏移距的变化情况便可获得包括反射纵波、转换波、多次波、折射波及面波等在内的多种波场的时间一空间道集的正演模拟记录，而且还能灵活地模拟井间和VSP地震剖面。
The article describes the method for modeling full wave field in 2-D viscoelastic medium- The method is characterized by the following essential polnts:The travel time is decomposed into horizontal component and vert1cal compo-nent.The forward modeled records of time-space trace gathers,which include vari-ous wave fields of reflected P-wave, converted wave, multiple, refracted wave and surface wave,can be produced only by considering how incident angle varies with offset,without tedious ray tracing done,under the presupposition of seismic linear source.Cross-borehole seismic section and VSP section can also be modeled success-fully.
The article describes the method for modeling full wave field in 2-D viscoelastic medium- The method is characterized by the following essential polnts:The travel time is decomposed into horizontal component and vert1cal compo-nent.The forward modeled records of time-space trace gathers,which include vari-ous wave fields of reflected P-wave, converted wave, multiple, refracted wave and surface wave,can be produced only by considering how incident angle varies with offset,without tedious ray tracing done,under the presupposition of seismic linear source.Cross-borehole seismic section and VSP section can also be modeled success-fully.
引文
1 Clint W Frasier. Discrete time solution of plane P-SV waves in a plane layered medium. Geophysics, 1970,35 (2): 197～ 219
2 Aminzadeh F and Mendel J M. Non-normal incidence state-space model and line source reflection syntheticseismogram. Geophysical Prospecting,1982, 30 (5 ): 541～ 5 68
3 Xiao Hong Xu- Downhole synthetic seismic profiles in elastic media. Geophysical Prospecting, 1990, 38(2):139～168
4 Ferber R-G. Time-domain computation of non-normal incidence wavefields in plane layered media. Gecaphysical Prospecting, 1988, 36 (8): 857～ 877
5许云.层状构造理论,石油工业出版社,1981
6杨文采。粘滞性介质中反射地震道合成.石油地球物理勘探,1986,21(6):615～623
7王彦春,段云卿.用褶积形式计算零偏移距VSP合成记录.石油地球物理勘探,1993,28(2):212～217
2 Aminzadeh F and Mendel J M. Non-normal incidence state-space model and line source reflection syntheticseismogram. Geophysical Prospecting,1982, 30 (5 ): 541～ 5 68
3 Xiao Hong Xu- Downhole synthetic seismic profiles in elastic media. Geophysical Prospecting, 1990, 38(2):139～168
4 Ferber R-G. Time-domain computation of non-normal incidence wavefields in plane layered media. Gecaphysical Prospecting, 1988, 36 (8): 857～ 877
5许云.层状构造理论,石油工业出版社,1981
6杨文采。粘滞性介质中反射地震道合成.石油地球物理勘探,1986,21(6):615～623
7王彦春,段云卿.用褶积形式计算零偏移距VSP合成记录.石油地球物理勘探,1993,28(2):212～217
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