North Tech Breakfast: Least-Squares Full Wavefield Migration
Nizar Chemingui of PGS will be holding a breakfast presentation, for members of the Geophysical Society of Houston, on least-squares full-wavefield migration.
Depth migration of primary reflections often yields an image with insufficient illumination due to limitations in acquisition or processing. Previously, we demonstrated that multiple reflections can illuminate a wider area of the subsurface and enhance the overall image quality, especially for shallow targets. However, migrating the full seismic wavefield (including primaries and multiples) often results in strong artifacts due to crosstalk between different orders of reflections.
In the presentation, we discuss a least-squares inversion solution for Full Wavefield Migration (FWM) that is capable of imaging all reflection modes in the data. The method solves for the earth reflectivity by means of data residual reduction in an iterative fashion. The inversion approach is key to enhancing the resolution of the image and compensating for the illumination variations due to incomplete acquisitions. The least-squares solution also attenuates the artifacts caused by the crosstalk between different orders of reflections. Successful applications to several field surveys demonstrate the effectiveness of the solution for migrating the full seismic wavefield and improving the quality of reflectivity models beyond the imaging of only primary reflections.
Dr. Nizar Chemingui: Department Manager, Seismic Imaging Technology, PGS
Dr. Chemingui is the Department Manager for Seismic Imaging Technology at PGS. He holds a Ph.D. in Geophysics from Stanford University, a Master’s degree from Rice University, and a Bachelor degree in Geophysics from the Colorado School of Mines. He joined the seismic industry in 1999. He worked for ExxonMobil in the subsurface imaging division and for GXT (now ION) as a Senior Research Geophysicist. In 2006 he joined PGS and has held various positions in the R&D department. He has authored and co-authored numerous publications and patents on seismic imaging. He received academic and professional awards for his work, including the Cecil H. and Ida Green award in geophysics from CSM and a best paper award in The Leading Edge. He is a member of SEG, EAGE, AGU, and GSH.
1201 Lake Robbins Drive
The Woodlands, TX 77380
Technical Talk will start at 7:30
Event will end by 8:30