Analysis of combined excitation effect of shear-wave vibroseis

HUANG Zhiqiang; YOU Zhengtao; LI Gang; FU Mingwei; WANG Ruohao; SHUAI Jun; ZHANG Guoxu

doi:10.16579/j.issn.1001.9669.2025.05.007

Abstract：Limited by the vibrator structure,there are some problems such as low down-going earth energy and shallow down-going depth of shear-wave signals when the shear-wave vibroseis is excited.Therefore,the influence of different combinations of shear-wave vibroseis vibrators on the excitation effect was innovatively studied through the three-dimensional finite element numerical simulation.Firstly,based on three-dimensional nine-component data and two types of combinations,eight modes of vibration excitation of combined shear-wave vibroseis were considered,a vibrator-earth finite element model was established,and an evaluation system of the vibration excitation effect of the combined shear-wave vibroseis was constructed.Secondly,based on this evaluation system,the influence of the various combined excitation modes of the shear-wave vibroseis on the downward energy of the earth,the downward depth of shear-wave signals and the mutual interference between combined excitation waves was analyzed in detail.The results show that,compared with a single shear-wave vibroseis,when two SHY shear-wave vibroseises are arranged side by side for the normal excitation,the incoming earth energy is increased by 86.36%,and the displacement amplitude of earth particles is increased by 73.40%on average.When two SHX shear-wave vibroseises are excited in the normal direction,the incoming earth energy increases by 97.48%,and the displacement amplitude of earth particles increases by 58.61%on average,which greatly improves the excitation effect.The research results can provide the guidance for improving the excitation effect of the shear-wave vibroseis and the reference for the design of combined excitation mode of the shear-wave vibroseis.