基于多阶模式的面波技术应用探讨

Study of multi-mode surface wave technology

传统意义上的面波技术往往只针对一条面波频散曲线,而实际层状介质中的面波存在多阶模式。通过数值模拟得到了多阶模式的面波频散曲线,对多阶模式面波频散曲线的基本形态和分布成因进行了介绍。分析了利用大偏移距面波资料和f-p方法获取多阶模式面波频散曲线的可能性,总结了利用多阶模式面波频散曲线反演横波速度和地层厚度的方法和效果,讨论了基于多阶模式的面波技术目前尚存在的诸多问题,为多阶模式面波技术在地震勘探中的应用提供了参考依据。

Traditionally,single dispersion curve is used in application of surface wave technology.In fact,surface wave has many modes in real layered medium,and corresponding dispersion curve can be generated by numerical simulation.This paper introduced the formation and distribution of multiple modes,discussed the possibility to extract multi-mode dispersion curve from long offset surface wave data use the f-p method,and documented the methods and their effectiveness for inverting S-wave velocity and formation thickness from multi-mode dispersion curve.Problems yet to be solved are also described.