High-resolution Tomography Using Offset-dependent Picking and Inversion Conditioned by Image-guided Interpolation
G. Hilburn, Y. He, Z. Yan and F. Sherrill
Event name: 76th EAGE Conference and Exhibition 2014
Session: Tomography - Theory
Publication date: 16 June 2014
Info: Extended abstract, PDF ( 552.38Kb )
Price: € 20
An approach to generating high-resolution velocity models through tomography is described which limits the impact of simplifications introduced by traditional tomography, in order to provide timely, accurate, and geologically reasonable models. First, offset-dependent picking tracks events in gathers better than curvature-based picking, particularly in areas of complex geology and anisotropy. This implementation can allow quicker and simpler gather flattening and reveal fine detail in models. Similarly, unguided tomographic inversion may yield velocity updates which appear geologically implausible by violating faults or layering, or updates which are very low resolution due to necessary post-processing. Applying image-guided interpolation as a preconditioning step within the inversion process leads to updates which automatically respect geological structures observed in stacked images. When implemented within a current tomography flow, these refinements make generation of high-resolution velocity models reasonable without trade-offs in computation time or accuracy.