Abstract：Complicated foothill areas have some geological characteristics such as undulating surface, large angle of underground overthrust nappe structure, stratigraphic inversion overlap and complex fault formation. On seismic data, we see mainly low signal-to-noise ratio and huge velocity vertical and horizontal variation. It is difficult to build high precision velocity modeling, and conventional seismic imaging method does not work. Therefore, we have adopted some approaches. We use constrained velocity inversion (CVI) to establish the initial velocity model for solving the problem of unstable velocity field. We build velocity model with 3D tomography and well constrained velocity modeling. We use shot domain wave equation prestack depth migration to the full aperture migration in order to solve the structural imaging problem in complicated foothill area.
