Dedicated software programs employ several techniques, including non-linear traveltime tomography, land-specific FWI, bending ray Kirchhoff migration, anisotropic depth imaging, and horizon-consistent velocity modeling, to achieve obtaining accurate earth models.
The near-surface model estimation uses nonlinear tomography, which considers topography and resolves lateral and vertical complexities. This can then be blended with the FWI solution for an integrated joint tomography/FWI velocity solution.
For land seismic acquisition, GRCI performs simultaneous source deblending, which is useful in reducing acquisition costs while improving data quality. GeoTomo has developed a methodology for deblending simultaneous source acquisition, which includes multiple source and self-sourced interference.
The methodology for vibroseis node acquisition is based on sound research and proven techniques, which involves using the residual left over after the coherent signal is re-blended and subtracted from the raw data in the common receiver domain. The method has a faster convergence compared to other approaches, especially on noisy data.
Compressive sensing reconstruction is also used, which involves using a non-uniform spacing of sources and/or receivers to estimate the complete data spectrum in an appropriate transform domain. This allows for the reconstruction of the data at a finer spacing. The software applies noise attenuation algorithms by running the compressive sensing reconstruction in the cross-spread domain, resulting in a finely sampled dataset with a regular grid.
Further information at grc-international.net
