New! VSP visualisation, processing and analysis now fully integrated in RokDoc.
RokDoc-VSP track
- Dedicated VSP display tools
- First break picking
- Support for multi-component data
- Processing tools
- Anisotropic analysis
- Shear-wave splitting, walk-around, walk-away
- Hodogram and rose diagram displays
- SEG Y Input and Output
RokDoc-VSP Summary
- Data loaded from SEG Y files
- Wide range of plotting options
- VSP Track displayed alongside logs and other RokDoc tracks
- VSP Traces plotted horizontally with trace origin at receiver position (MD, TVD or TWT) or vertically
- Variable area and coloured
- Amplitude spectra displays
- Support for shot or receiver gather displays
RokDoc-VSP Picking
Interval velocity logs
Interval velocity logs (shown in red) are computed from picks of
P- and Shear-waves.
RokDoc-VSP Interval velocity logs
Picking
- Supports free style, snapping or autotracking
- Picks stored with trace headers
- Picks loaded from, or exported to file
Left track shows the upgoing wavefield following separation. Central track shows upgoing wavefield with a deconvolution operator applied. Data are stacked to give the Corridor Stack in the right track. The data processing steps applied are shown to the right of the plots.
Processing
Flow built up by selecting VSP processing steps:
- Statics
- Filters and mutes
- True amplitude recovery
- Wavefield separation
- Deconvolution
- Corridor stacks
- Additional tools for multi-component geophone rotations and receiver gather statics
Hodograms
- For multicomponent data, hodograms enable a QC to be made of the geophone rotation and help in identifying potential shear-wave splitting
- Following geophone rotation, the P-wave energy at first break is on the radial component (left box)
- Possible shear-wave splitting can be identified (right box)
Walk-Away VSP Analysis
Four functions are available for anisotropy analysis of VSP data
- A three-component algorithm computes polarization and timedelays from potential split shear-waves.
- A four-component dual source/dual receiver rotation method (Alford Rotation).
- Inversion of vertical and horizontal slowness data from walk-away VSP geometries.
- Inversion of travel times and P-wave polarizations from walkaround VSP geometries.
- Multi-well method for displaying angle based log and discrete sets.
- Particularly designed for plotting azimuthal distributions of fracture data, for example derived from FMI interpretations or from the output of the VSP shear-wave splitting analysis.