Velocity modeling is a key part of most imaging projects, especially those in which seismic data will be migrated into the depth domain (PreSDM).
Our GX Technology (GXT) group has developed a proven suite of pre-stack velocity analysis and model-building tools that can be combined, as needed, to obtain the best possible velocity model for each project. Methods of velocity estimation include tomography, gather-flattening and gather-fitting techniques, and scans on velocity-perturbed stacks.
Velocity models may be built layered or non-layered, depending on the geologic complexity. The choice of layered or non-layered tomography is often geology dependent. The layer-based approach is generally used in areas where stratigraphic sequence layering is predominant. Non-layered tomography is applied in compacted environments or poorly illuminated areas where picking layers to identify velocity boundaries is difficult.
GXT tools are designed with versatility in mind, allowing the user to build a variety of complicated velocity models including faulted blocks, lenses, and overhanging salt bodies. The vast majority of GXT’s modeling tools incorporate proprietary editing, auto-picking, and QC features to speed the interpretation process.
