Study on Method of Crosshole Seismic Tomography by Wavelet Transform

摘要

Combining the multiiesolution analysis (MRA) with tomography, this paper proposes a new method of crosshole seismic tomography named the wavelet multiscale seismic traveltime tomography. The method overcomes the drawbacks of linearized inversion depending on initial model and easily trapped by local minimum, and greatly improves the performance of linearized inversion. The results of numerical modeling and field application show that the main advantages of the new algorithm are: reaching the global minimum; inversion results less depending on the initial model; good stability; high resolution and high quality of tomography, and is suitable for non-uniform media with high contrast velocity, and also provides different resolution inverse results benefiting geological interpretation of tomographic images.