SeismicCity products

We are using two methods for velocity analysis and construction of the layered velocity fields. The first tool is reflection tomography. Reflection tomography is a grid or layer based global inversion technique. It is based on iterations of full volume prestack depth migration, where at each iteration residual curvature is analyzed on image gathers and is input to a minimization process. The tomographic inversion and update which we are using is built to optimize the velocity field, as well as anisotropic delta and epsilon fields. A fully TTI model can be optimized for use in TTI prestack depth migration when dip and azimuth fields are input.

Reverse Time Migration (RTM) has become the method of choice for seismic imaging in complicated areas. The method is based on directly solving the wave equation in the time domain (as opposed to the frequency domain). RTM can accurately handle any variation in subsurface material properties, and has no limit in imaging steep dips. RTM is not based on ray tracing and hence can perform in situations where Kirchhoff ray based migration breaks down.