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Geogiga - Version DW Tomo -2D Refraction Tomography Software
Estimate subsurface velocity structures with efficient first-break picking and fast shortest path ray tracing
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Data input
- Import all records of a survey line at one time
- Efficiently assign geometry measured with slope or horizontal distance
- Input elevation data
- Optionally load first-break picks together with seismic data for reprocessing
- Support most third-party picks formats
Data processing
- AGC, trace balance, and frequency filtering
- Trigger delay correction
- Undo or redo multiple steps in data processing
First-break picking
- Manually pick first breaks with a trace magnifier
- Automatically pick first breaks guided by velocity or waveform phase
- Test layer velocity on refraction waveforms
- Overlay shear waves of opposite polarity to assist picking
- Merge multiple picks files
Tomography
- Initial model building based on the travel time versus offset plot or a velocity file
- Fast shortest path ray tracing
- Regularized tomographic inversion with multiple constraints
- Update the display of first arrivals and ray paths in real time
- Display the picked and calculated first arrivals on seismic traces
- Interactively pause and resume or stop the tomography procedure
- Review results of each iteration with fitting error analysis
Plotting
- Display velocity sections with colours, contours, and editable lithologic symbols
- Overlay velocity section with ray paths
- Trim velocity section based on ray paths and receiver locations
- Plot well data
- Show receiver and shot point locations on velocity section
Output
- Picks file into REFRACTOR for conventional refraction analysis
- Velocity section with a blanking file
- Statics for reflection data processing
