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对地质模型进行瑞利面波正演计算可以模拟地震波在地下介质中的传播规律,以明确地质体瑞利面波记录特征。在瑞利面波资料解释过程中,对地质模型的正演计算可以对解释结果进行验证,并能提供地下地质体地震波岩石物理响应特性。本文首先根据地震波叠加原理,模拟计算3种常见速度结构地层条件下的瑞利面波波形记录;然后分析讨论了不同速度和厚度结构地层的高阶和基阶面波的能量分布和面波波形记录特征,研究结果证明由于地层速度和厚度结构的差异,各阶模态面波的能量分布不同,形成特征不同的波形记录。模拟面波波形能够帮助判断地层速度特征、指导野外施工参数设计等工作。在面波勘探工作中,具有重要的实用价值。
For the geological model, Rayleigh surface wave forward modeling can simulate the propagation of seismic waves in the underground medium, so as to make it clear the Rayleigh wave records of the geological body. During the Rayleigh surface wave data interpretation, the forward modeling of the geological model can verify the interpretation results and provide the petrophysical response characteristics of the seismic waves of the subterranean geological body. In this paper, firstly, according to the superposition principle of seismic waves, the Rayleigh wave records of three common velocity structures are simulated and calculated. Then, the energy distributions and surface waveforms of high order and fundamental order surface waves of different velocity and thickness strata are analyzed and discussed. The results show that due to the difference of formation velocity and thickness structure, the energy distribution of each mode surface wave is different, and the waveform records with different characteristics are formed. Simulation of surface wave waveform can help determine the characteristics of the formation velocity and guide the design of field construction parameters. In surface wave exploration, it has important practical value.