TomoPlus is GeoTomo’s near-surface solutions software package. It is designed to obtain an accurate near-surface velocity model with irregular geometry and rough topography, and derive accurate long and short wavelength statics solutions to help seismic data processing.
TomoPlus offers both conventional and high end near-surface refraction solutions to handle a variety of near-surface problems. In simple situations, conventional approaches ensure resolving high velocity contrasts and offer high-resolution solutions. In complex areas, conventional methods may be applied to derive a good initial velocity model, and then high end imaging technologies such as traveltime tomography or waveform tomography can be further applied to resolve additional detail. Besides several robust automatic first break pickers, TomoPlus offers the following near-surface seismic imaging approaches:
• 2D/3D refraction delay time solutions
• 2D/3D GLI refraction traveltime inversions
• 2D refraction traveltime migration
• 2D/3D first arrival nonlinear traveltime tomography
• 2D/3D early arrival waveform tomography in time domain (optional)
• 2D/3D refraction traveltime residual statics solutions
• 2D/3D high precision microgravity forward modeling and inversion
• 3D full waveform inversion in frequency domain (Shell exclusive)
• 3D dispersion curve inversions (Shell exclusive)
• New! 2D/3D wave equation traveltime tomography
• New! Pseudo 3D elastic waveform tomography
• Joint Traveltime – Waveform Tomography (JTWF) [click here]
• Joint Traveltime, Early Arrival Waveform, & Waveform Envelope Inversion “New Solution” [click here]
• Joint Traveltime – Gravity Tomography [click here]
• Joint Traveltime – Electromagnetic (EM) Inversion “New Solution” [click here]
These imaging technologies are included to solve the near-surface problems in various situations. In addition, it presents a large number of QC and utility functions to facilitate the use of these imaging technologies.
TomoPlus is designed for Linux Workstations or Linux Clusters. For any evaluation request, please contact: info@geotomo.com
FWI – Full Waveform Inversion
TomoPlus is the only commercial near-surface software package that offers a Full Waveform Tomography solution for solving complex near-surface statics and velocity problems in areas where karst, low velocity layers, outcropping refractors, and strong velocity contrasts exist. Other near-surface solutions such as Delay-Time, GLI and Traveltime techniques may fail in these complex environments.
FWI & Traveltime 2D Land Example:
Nonlinear Traveltime Tomography
Nonlinear Traveltime Tomography is a fundamental core technology in solving complex near-surface imaging and statics problems. Nonlinear Traveltime Tomography is a robust grid-based inversion technique that is capable of providing an accurate solution in complex geology with features such as vertical velocity gradients, dipping layers and pinch outs. Delay-Time and GLI solutions fail with these complexities.
Joint Seismic-Gravity Inversion
TomoPlus is the only commercial near-surface software package that offers a 2D /3D simultaneous Joint Seismic-Gravity Tomography for solving complex near-surface statics and velocity problems in areas such as desert environments. Features such as dunes, wadis, and sabkhas and the presence of dissolution cavities in shallow limestone and evaporitic rocks (i.e. karsting) complicate the velocity distribution. When these complexities exist in the near-surface, conventional velocity analysis methods such as Delay-Time, GLI and Traveltime techniques typically fall, therefore requiring more advanced technologies and or additional information such as gravity or EM to resolve these complexities.
Fundamental Near-Surface Solutions
TomoPlus includes all fundamental near-surface solutions
GLI3D – Generalized Linear Inversion
GLI3D was originally developed and marketed by Hampson-Russell and is now owned by GeoTomo and is an integral part of our TomoPlus package. GLI3D is layer based and has been an industry standard for many years. It is a stable and robust solution for flat or dipping layered structures and constant vertical velocities .
Delay Time Refraction Statics
Delay Time Statics is also layer based and has been an industry standard for many years. It is a quick, easy, and robust solution for locally flat layered structures and locally constant velocities.
Solution Comparison on Complex Foothills Model
First-Break Picking
TomoPlus with advanced picking technologies
First-Break Picking continues to be at the forefront of GeoTomo’s research and development. We understand that first- break picking is one of the keys to a great tomography result and is also one of the burdensome tasks that slows down turnaround time. TomoPlus includes advanced automatic picking technologies specifically designed for dynamite, airgun and vibrator data to make picking easy, fast and accurate.
TomoPlus with flexible workflow picking
TomoPlus has interactive and batch processing modules that allow any combination of processing modules (ie filtering, scaling, noise attenuation, etc) to be applied prior to picking first breaks. Choose from over 73 processing modules.
Workflows include:
• Apply moveout functions prior to picking first breaks
• Apply statics internally to enhance coherency prior to picking
• Inversion-based picking using synthetic traveltime
QC of the First-Break Picking
Reciprocal Traveltime Errors 
During picking, it interactively calculates reciprocal traveltime errors for shots with picks available and displays on shot map. This will help users to select a different picking strategy for a subset of data that may not be picked well previously.
Pick Similarity
For any two closest shots, the first-arrival events should be similar, and the differences of the first breaks between the two gathers should be very small. Therefore, the RMS of the traveltime differences is a good indicator for characterizing the pick quality of a shot.
Tomography Misfit 
After completing the near-surface imaging, you may select a threshold for RMS misfit, and it will highlight the shots with misfit larger than that threshold in shot map. This will help you to examine these shots with bad picks
Building Initial Models
TomoPlus offers a number of methods to build initial models in 2D and 3D for GLI3D inversions, traveltime tomography, waveform tomography, and dispersion-curve inversions. These include refraction analytical solutions, delay-time solutions, and uphole velocity model builder.
Near – Surface Imaging
TomoPlus offers multiple imaging solutions and multiple methods for quality control. For example, during 2D tomographic inversion, it offers total RMS misfit and also misfit per shot. It also iteratively displays the updated velocity model. TomoPlus tomography input parameters are interactive. Users may change the parameters during a job and they will be taken into the program immediately. TomoPlus traveltime tomography and waveform tomography utilize cluster CPUs in an efficient manner such that all CPUs are 100% fully running at all time