FBM Fast Beam Migration
FBM is Z-Terra’s Fast Beam Migration, a super-efficient algorithm that is two orders of magnitude faster than the industry standard Kirchhoff depth migration. Fast Beam Migration images multipathing energy, a property that is typically associated with wave equation migration algorithms. The faster and more accurate imaging step allows for more iterations of velocity model building (50–100 iterations in lieu of the current 5–10.) A greater number of velocity updates enables the processing team to enhance the resolution and imaging of complex geologic structures. Improved velocity models in combination with FBM or wave equation imaging can provide much greater resolution and accuracy than that which can currently be obtained with standard imaging technology. A beam represents a seismic event and is characterized by a particular arrival time, location, amplitude, orientation, curvature, and extent. The extent of a beam is controlled by an amplitude taper, which can be understood as the imaginary part of a complex valued event curvature. In the process of seismic imaging, the beam changes its position in time and space, as well as its amplitude, orientation, and complex curvature. Once migrated to the correct time, these parameters are used to locally reconstruct the seismic image.
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