Refraction Tomography does not require layer assignment and phantom time-distance curves. The complex velocity structure can be directly estimated from first arrivals. This approach is especially suitable to derive the structure with no distinct layer interface due to the gradual velocity change where the traditional refraction interpretation methods are invalid.
DW TOMO utilizes the robust grid ray tracing and regularized inversion with constraints in tomography. The estimated velocity model can also be used for static correction in seismic reflection data processing.
Features
Automatically or manually pick first arrivals with a trace magnifier
Overlay shear wave recordsnew
Robust grid ray tracing
Regularized iterative inversion with constraints
Build an initial layered gradient model based on traveltime curves
Load a velocity file or interactively build an initial model
Allow rough ground surface
Check the picked and calculated first arrivals directly on seismic traces
Fitting error analysis
Interactively pause and resume or stop the tomography procedure
Simultaneously update the display of first arrivals and ray paths
Review the inverted model in each iteration
Overlay velocity section with ray paths
Trim velocity section by the coverage of rays or receiver locations new
Plot well data on the velocity section
Plot velocity section with colors, contours, and editable lithologic symbols
Load all shots at one time
Merge multiple TT curve files into one file
Check and assign geometry with layout chart
Input geometry as slope or horizontal distance for seismic data collected across topography
Trigger delay correction
Filter and scale seismic data with support of undo and redo functions
