Elastic full waveform inversion for near-surface imaging in CMP domain

Abstract

We develop an elastic full waveform inversion method in the CMP domain for near surface imaging. Sometimes, applying acoustic wavefield solution may not be sufficient for near surface imaging on land. On the other hand, performing 2D or 3D elastic waveform inversion in shot domain is highly time-consuming. A practical approach for solving an elastic problem is to conduct 1D inversion in the CMP domain and then interpolate the interval velocities at CMP locations to create a 2D or 3D velocity model. The CMP method assumes small lateral velocity variation in the local area, thus, it may not be suitable for imaging complex structures, yet useful for many land cases. Numerical tests on synthetic and application on field data from an oil field in China produces reliable results.