Schlumberger

Reverse Time Migration (RTM)

Overview Library

Image in and below areas with structural and velocity complexities

Reverse-time migration is an ultrahigh-end prestack two-way wave-equation migration for accurate imaging in and below areas with both great structural and velocity complexities, such as sedimentary areas with steep salt inclusions. RTM has a proven track record for generating final images and is increasingly used for refining structural boundaries during velocity model building.

High-fidelity algorithm for imaging the most complex structures

RTM computes numerical solutions to the complete wave-equation. As such, it has no dip limitation and handles all complex waveform multipathing, including caustics and prismatic waves. Historically, RTM was deemed impractical due to high computational costs and a greater sensitivity to velocity and reflectivity parameters than the more established one-way downward-continuation methods. However, our massive parallel compute clusters, coupled with more accurate velocity model building workflows, now make RTM a viable option in the imaging portfolio.

RTM has been extended to incorporate vertical transverse isotropy (VTI) and, recently, tilted transverse isotropy (TTI), and is fully compliant with the latest multi- wide- and full-azimuth geometries.

Dense Anisotropic (TTI) Angle Gathers from RTM for High-Fidelity Model Refinement

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WesternGeco

A Proven Track Record

WesternGeco's Reverse Time Migration (RTM) accurately images steep dips in complex sub-salt areas as demonstrated on the BP 2004 velocity benchmark dataset.
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