Ray Tracing and Illumination (RTI) enables interactive illumination studies through velocity models using advanced ray tracing in both isotropic and anisotropic (VTI and TTI) models. Combining interactive ray tracing and illumination studies gives interpreters and geophysicists the ability to interrogate and validate complex velocity models for imaging and acquisition related issues. Complex ray signatures involving reflections, transmissions, and wave-type conversions can be specified.
- Provision of essential imaging information for target zones for improved understanding of complex geologic areas
- Generation of survey designs to achieve required illumination of target zones within a velocity model
- Model validation using checkshot information by comparing with measured data
- Migration aperture validation and other seismic processing parameter analysis by relating surface acquisition to imaging points within the model
- Ray shooting—Shoot a single ray, a fan of rays, or a cone of rays from any defined source locations in any direction. The shooting direction can be specified according to source point, suitable for normal incidence ray-tracing of a target horizon, for example.
- Two-point ray tracing—Find rays shot between source and receiver points. This is the classic application used for simulating surface and downhole acquisition geometries. Rays can be selected as first arrival, maximum energy, or shortest path.
- Offset ray—Find a pair of specular rays satisfying a required relative surface offset and azimuth of the two ray endpoints. This is an extension to normal incidence ray tracing and the method used in common-image-point tomography.
- Checkshot model validation—Test whether the Volcan velocity model is in agreement with observed checkshot data by comparing ray-traced travel times with observed times.
- Illumination spectrum—Determine for a target analysis point the range of target dips and azimuths that can be illuminated. This aids the user in selecting between alternative inter-pretations or choosing a shooting direction for acquisition.
- Fold of coverage analysis—Create binned hit count and attribute maps of midpoints and ray reflection points. Allows offset and azimuth binning, creating a series of maps that can be displayed individually or in any summed combination.
- Basic acquisition geometry modeling—Create pointsets for geometry constructs (points, lines, grids, circles, spirals, and well trajectories); import P190 and DIO files; replicate pointsets based on a seed pointset; display rose diagrams.
- Synthetic seismograms—Generate synthetic shot gathers from two-point ray-tracing experiments using a user-defined wavelet.
- Map Migration visualization—Reshoot and display rays shot using the Map Migration plugin for the Petrel platform.