TomoPlus New Features and Fixes

Survey Map:

1)      For processing a multi-line project, it can automatically create a processing project for every SEGY file using an ASCII name list with all of the SEGY files listed.

2)      In VIEWM, selecting the function "Update Project Xline Data" under File will
refresh cross-line constraints from other 2D lines instantly.

TomoPlus Utility:

1)      Added a function to delete all existing files in a temporary working directory under each local node automatically.

2DPICKER:

1)      After building a new project, it will automatically create a 2D Line Traverse using receiver coordinates.  This will allow interpolation of LMO velocities along a 2D line, creating a velocity model from LMO, and calculation of reciprocal errors during picking.

2)      Variable LMO for automatic first-break picking: allows displaying a CSG or CRG in shot offset domain and picking multiple moveout velocities, interpolating the LMO at selected shots or receivers for automatic first-break picking.

3)      While picking first breaks, it interactively updates the Reciprocal Errors of the shots that have been picked in shot map, allowing users to QC picks and identify shots with bad picks.

4)      Top Menu Bar has been modified: Edit, Picks, and LMO are added on the top menu bar.

5)      Offline Traveltime Corrections: if source positions are off the receiver line, a 3D correction equation is applied to the near-offset traveltimes for making good 2D geometry approximation in Export 2D Picks.

2DTTIME:

1)      Traveltime Utilities have been modified to handle large files throughout the system.

2)      Building Initial Models: output a 1D analytical velocity model along surface topography in both grid format for traveltime and waveform tomography, and in layer format for GLI inversion.

3)      In the case of processing multiple 2D lines using Survey Map, building an initial model for the current 2D line will create cross-line velocity constraints in the form of "upholes" from other 2D lines that have been completed, and the cross-line velocities will be displayed on the top of the initial velocity model in the middle panel. 

4)      When building an initial velocity model, it offers options to create topography from Source Elevation, Receiver Elevation, or both.  If the traveltime picks are made for partial sources, the velocity model range will always cover all of the sources and receivers so that statics calculation can be done for all the sources and receivers.

5)      All utility functions in this module has been modified to use .gtt format traveltimes for fast calculation. 

6)      The functions “Remove Shots” and “Select Partial Shots” under Data Selection have been merged to a single new function called Select Partial Shots. It has the options of “Remove Shots” and “Select Shots.”

2DIMAGING

1)      GLI2D Inversion is included in 2DIMAGING for the first time.  Given an initial layer velocity model, it will iteratively invert layer velocities and layer thickness, and output a new model and calculated traveltimes for the final model.  It also outputs a residual statics file derived from the differences between traveltime data and calculated traveltimes.

2)      2D Waveform Inversion in Time Domain: implement a new finite-difference modeling program that can handle rough topography, and implement a new cluster management method that can efficiently perform waveform inversions.  The method allows each slave node to operate at full capacity the entire time, and will not affect the job if any node stops working.

3)      Model update display has been improved so that the reported problem of occasionally missing display has been fixed.

4)      2D traveltime tomography outputs a log file with user's name as part of the file name, so that multiple users can process the same project.

5)      In 2D traveltime tomography, the input model applies a square cell, with the cell length (dx) is half of the receiver spacing for default when building the initial model.  The inversion grid DX (number of dx) is set by Receiver Spacing/dx by default so that the horizontal grid length for inversion is the receiver spacing.

2DVIEWM

1)      Added a new 2D acoustic finite-difference modeling program for forward modeling.  This program is a parallel version and implemented in the exact same fashion as in the waveform inversion.  It can handle rough topography on the surface.

2)      Users define two datum curves and save those in one datum file, and it allows the intermediate datum above the final datum.

3)      Added a new display function to toggle between two velocity models in the display and the model differences so that users can observe the changes.

2DSTATS

1)      Define a new statics ASCII file format .stt that includes all of the information needed, such as Source ID, current x, y, z coordinates (in 2D), original x, y, z coordinates (in 3D), source depth, intermediate datum, final datum, residual statics, long-wavelength statics, total statics, and same for receivers.

2)      The calculation of long-wavelength statics (TomoStatics, Delay-Time statics, and GLI statics) with a single function is available, and refraction residual statics is an option in the panel.

3)      Modified display functions that allow showing all fields in .stt file, and modified all related utility functions to handle .stt file format.

4)      Export ASCII Statics is included under File to output a statics file with any IDs and any fields from the .stt file as users need for processing.

3DPICKER

1)      Variable LMO for automatic first-break picking: allows displaying a CSG or CRG in shot offset domain and picking multiple moveout velocities, interpolating the LMO at selected shots or receivers for automatic first-break picking.

2)      While picking the first breaks, it interactively updates Reciprocal Errors of the shots that have been picked in the shot map, allowing users to QC picks and identify shots with bad picks.

3)      Top Menu Bar: Edit, Picks, and LMO are added on the top menu bar.

4)      After 3D traveltime tomography, it allows users to export a shot list for those with RMS misfit larger than a user-defined value.  The shot list can be uploaded in 3DPICKER in Shot Map, and those shots shall be shown with stars in black.  If users select any of those "black shots" and modify picks, it will change to a black cross from a back star in Shot Map.

3DTTIME

1)      Traveltime Utilities have been modified to handle large files throughout the system.

2)      Icons have been rearranged on the top menu bar.  Three functions are usually needed in a sequence, Remove Poor Picks, Rotation, and Build Initial Model, thus they are displayed together in the same sequence.

3)      Building Initial Models: output a 1D analytical velocity model along surface topography in both grid format for traveltime and waveform tomography, and in layer format for GLI3D inversion.

4)      When building an initial velocity model, it offers options to create topography from Source Elevation, Receiver Elevation, or both.  If the traveltime picks are made for partial sources, the velocity model range will always cover all of the sources and receivers so that statics calculation can be done for all the sources and receivers.

5)   All utility functions in this module has been modified to use .gtt format traveltimes for fast calculation.

6)   The functions “Remove Shots” and “Select Partial Shots” under Data Selection have been merged to a single new function called Select Partial Shots. It has the options of “Remove Shots” and “Select Shots.”

3DIMAGING

1)      GLI3D Inversion is included in 3DIMAGING for the first time.  Given an initial layer velocity model, it shall iteratively invert layer velocities and layer thickness, and output a new 3D model and calculated traveltimes for the final model.  It also outputs a residual statics file derived from the differences between traveltime data and calculated traveltimes.

2)      "Iterations" and "Smoothing Control" in 3D traveltime tomography allow for making interactive changes during inversions just like in 2D traveltime tomography.

3)      3D traveltime tomography outputs a log file with user's name as part of the file name, so that multiple users can process the same project.

4)      3D time-domain waveform tomography is released for internal testing and for sponsors to test.  Therefore, this is an alpha release of the functionality.

3DVIEWM

1)      Added a 3D geometry builder for designing 3D surface seismic survey, and output geometry can used for 3D raytracing or 3D finite-difference wavefield modeling.

2)      Added a new 3D acoustic finite-difference modeling program for forward modeling.  This program is a parallel version and it is specifically designed to handle rough surface topography.

3)      Users define two datum curves and save in one datum file (.3dtm), and it allows the intermediate datum above the final datum.

3DSTATS

1)      Define a new statics ASCII file format .stt that includes all of the information needed, such as Source ID, current x, y, z coordinates (in 2D), original x, y, z coordinates (in 3D), source depth, intermediate datum, final datum, residual statics, long-wavelength statics, total statics, and same for receivers.

2)      The calculation of long-wavelength statics (TomoStatics, Delay-Time statics, and GLI3D statics) with a single function is available, and refraction residual statics is an option in the panel.

3)      Modified display functions that allow showing all fields in .stt file, and modified all related utility functions to handle .stt file format.

4)      Export ASCII Statics is included under File to output a statics file with any IDs and any fields from the .stt file as users need for processing.