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Cross-Hole and VSP Traveltime Tomography Software


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TOMOX is designed for performing cross-hole and VSP traveltime tomography. Its rapid computation capability allows you to reconstruct the velocity structures real time in a production environment. With eight modules, you are able to start with the seismic traces, then generate and interpret image solutions. It also allows you to view well-logging data. You may apply the log information to constrain tomography or compare a tomographic solution with the well-logging data. Tomographic imaging can directly provide you with the structure solution that you need to find oil and gas reserves, or for any other seismic data processing.


Cross-Hole Tomography

Cross-hole seismic survey provides ideal raypath coverage for imaging the seismic velocity structures between two close wells. However, applying any conventional "ray-shooting" traveltime calculation technique for cross-hole imaging requires significant computer power. Thus, cross-hole imaging used to be very difficult for real application. Tomographic method in the software applies a rapid wavefront raytracing technique for simultaneous time and raypath calculation. Its computation time is independent of the number of receivers. In addition, it analyzes velocity structures prior to raytracing and inversion for optimizing the computation. These improvements and the new techniques enable cross-hole imaging to be completed in minutes or even seconds on a PC.

VSP Tomography

VSP is a low-cost seismic survey in depth. VSP imaging helps to extend the seismic velocity structures laterally from a single well point. Well logging results often present local velocity measurements only, while VSP tomographic imaging with the well-log constraints can resolve near-well velocity structures more accurately. Since VSP tomographic imaging is fast, and uses the first-arrival times only, it can always provide a first and quick look at the subsurface regardless of how complicated the down-going and up-doing multiples might be. The Rapid wavefront raytracer can be used in planning VSP surveys to determine source offsets for the required subsurface coverage. It can be also used as an aid in understanding the VSP traveltime responses of geologic features such as dip, faults, and diffractions.



View Well-Log Data and Build Tomography Constraints

TOMOX has many similar modules as TOMO+.  In addition, its Well Log module allows you to view well-log data in various formats and build constraints for tomographic inversion.  You may also compare well-log data with tomographic solution for QC control.

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Cross-Hole Tomography Case History

The S-wave velocity image shown on the right is resolved through nonlinear cross-hole tomographic imaging using TOMOX with real data collected in the Michigan basin. The central oil and gas production zones are characterized by low velocities, where the rock porosity is about 20%. The high- velocity structures around the oil and gas reserves represent carbonates and salts. Shells production well is located at the center of the image. It has kept producing oil and gas for the past 20 years. Current down-hole perforation depth is at the level of 4650 feet. The results of tomographic imaging suggest that this well is reaching its late production stage in the reserves.


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VSP Tomography Experiment

A single well is assumed to be at 290 m. This VSP survey assumes 9 sources on the surface and 50 receivers in the well. The true model (left) contains a flat interface as well as a low-velocity zone. VSP tomography can rapidly reconstruct the velocities starting from a homogeneous model.

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