Abstract:Usually surface inversion is performed with the high-frequency surface wave acquired with small trace interval at short spreads.Near-surface structure inversion is also conducted with surface waves from surface seismic data.Real seismic data decrease the accuracy of frequency dispersion curve during the surface wave inversion due to data complexity,which will affect the results of near-surface structure inversion.In this paper,the authors make a detailed analysis about some difficulties of frequency dispersion analysis during the multi-trace analysis of surface wave (MASW),for example,how to determine the minimum offset and the quantity of seismic traces used for frequency dispersion analysis,and how to process strong surface waves and weak surface waves on the same shot data.At the same time,some discussions are made about frequency dispersion curve accuracy improvement.Analysis results on real data prove that our method is effective and can achieve favorable near-surface structure inversion results.
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