Sep 6th-Data Proc. & Acquisn. SIG: Least-Squares RTM in the Data and Image Domains*
Sponsored by Schlumberger
Event Location:
Schlumberger
Q Auditorium
10001 Richmond Avenue
Houston TX 77042 USA
NOTE: You Must be Logged in to Register
Speaker: Richard Coates, Schlumberger
Illumination effects - caused by complex geologic settings, under-sampled acquisition geometry, and limited recording aperture - pose challenges to even advanced imaging algorithms. In addition, standard depth-migration images can suffer from lack of resolution caused by wavelet stretch, attenuation, and suboptimal deghosting.
Recently, interest has grown in least-squares migration as a way to mitigate many of these problems and produce better resolved migration images suitable for AVO inversion. This approach can be formulated in either the data-, or the image-domain. However, in either case, LSM is an inversion algorithm and is sensitive to inaccuracies in the source wavelet, velocity model, data preprocessing, and the propagator used. Practical considerations for mitigating these problems under non-ideal conditions and cost-reduction strategies differ between the data- and image-domain formulations.
The relative merits of each approach are evaluated by using example inversions for complex synthetic models, including free-surface ghost and attenuation effects, and an application of image-domain least-squares migration on a Gulf of Mexico field data set produces significant improvements in resolution and event continuity in the subsalt target region.
Speaker: Richard Coates, Schlumberger
Richard Coates is Research Manager for FWI & RTM and Scientific Advisor at Schlumberger. Prior to joining Schlumberger Richard earned a BA and MA in Natural Sciences (Physics) and a PhD in Geophysics, all from the University of Cambridge and between 1990 and 1992 was a Post-Doctoral Researcher at the Earth Resource Lab at MIT. In 1992 Richard joined Schlumberger, working first as a Research Scientist in the Geophysics Department at Schlumberger research center in Cambridge England. In 1997 he moved to the Schlumberger-Doll research center in Ridgefield, CT, where he became Research Program Manager for Borehole Acoustic & Seismics, and in 2007 he moved, with the entire Schlumberger-Doll facility, to Boston, MA. He has held his present role, in Houston, since 2011.
Time Schedule:
4:30 PM – sign-in, social time
5:00 PM – start of presentation
6:00 PM - close of meeting
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