WellTomo crosswell travel-time seismic tomography software is designed for solving both direct and inverse tomography problems on either straight or curved rays. Curved ray tracing is implemented via solution of the eikonal equation.
Direct tomography problem solution consists of ray tracing from a set of sources to a set of receivers through a known velocity model. Inverse problem solution is a reconstruction of the velocity model, a system of linear equations is solved via an SVD-based algorithm.
For the direct problem solution, the input data are the coordinates (X, Z) of the source-receiver couples and a velocity model. A ray from a source to a receiver can be considered as eithrer straight or curved. The solution is a set of calculated travel times along each of the rays. As a result, the initial table with the coordinates of sources and receivers is supplemented by a column with the travel time values for each of the source-receiver couple.
For the inverse problem, the input data are the coordinates (X, Z) of the source-receiver couples and a zero-approximation of the velocity model. For the initial model the rays are traced from the sources to the receivers. The velocity model is reconstructed basing on the difference between the observed travel times and those measured along the traced rays. The process can be made interactive – in this case, the velocity model obtained as a result of the previous iteration is supplied as an input for the next iteration, in order to obtain more accurate results.
User-friendly interface allows quick and easy mastering the skills of working with the software.
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