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Reverse Time Migration

Seismic imaging accuracy for complex basins.


Reverse Time Migration (RTM) is a preferred solution for imaging seismic data in areas of complex wave phenomena. It easily handles the most severe combinations of structural dip with high velocity contrast that are common in salt basins and other structures with complex geology. Its turning wave capability provides enhanced imaging of steep dips and overhangs.

Reverse Time Migration is an integral part of these emerson e&p software solutions:

RTM performs 2D and 3D prestack depth migration and modeling with isotropic and anisotropic (VTI & TTI) models using a two-way, finite difference solution to the wave equation, including density. The powerful RTM solution improves the accuracy and quality of subsurface images while achieving efficient throughput on high performance clusters, either CPU or GPU.

Reverse Time Migration features include:

 
  • Streamer, Ocean Bottom Cable, Nodal and Onshore data acquisition support
  • Mirror Imaging workflows
  • Subsurface acquisitions (e.g. VSP)
  • Forward modeling to generate 2D/3D synthetic seismic data (add-on)
  • CPU and GPU configurations with no “switch” costs
  • Offset vector gather creation for velocity QC
  • Absorbing boundaries, illumination, and pre- and post-migration low frequency noise suppression for improved imaging quality
  • Poststack migration
 

Emerson RTM – Fully integrated with Echos and Epos

Reverse Time Migration is seamlessly integrated with Echos enabling one platform to be used for data preconditioning, seismic imaging, and post-image processing. A flexible, multi-level parallelization scheme allows efficient distribution and processing of the seismic data within and across compute nodes. Available as an Add-on to the Echo users are able to apply intelligent muting, super-shot formation, and stacking of common image gathers with the convenience of one processing system.

Velocity models developed and refined in GeoDepth and SKUA-GOCAD drive workflow efficiencies when updating a seismic image in RTM. RTM is also fully integrated with Epos seismic and velocity repositories.

 

What is Reverse Time Migration?

Reverse time migration belongs to the class of two-wave full wave migration solutions. Rather than performing imaging by extrapolating the data in depth, as in traditional one-way full wave solutions, the method solves the wave equation forward in time for the source modeling field and backward in time for the recorded receiver field for that shot. At each time step, the depth image is obtained by cross-correlating the two fields. Reverse time migration has been demonstrated to achieve a significant level of multiple energy attenuation by nature of its two-way extrapolation backward in time.
 

Innovation meets complex objectives

By leveraging the latest high-performance computing technologies and techniques, RTM is a candidate for application to any of the industry’s richest and largest seismic acquisitions.

 

System Requirements

  • 64-bit Red Hat® Enterprise Linux 6.8 and subsequent minor releases, and 7.1 and subsequent minor releases
  • GPU's (optional):  NVIDIA Tesla GPUs