--> Abstract: Gaussian Beam De-Migration and Re-Migration, by Jianming Sheng and Chengbin Peng; #90105 (2010)
[First Hit]

Datapages, Inc.Print this page

AAPG GEO 2010 Middle East
Geoscience Conference & Exhibition
Innovative Geoscience Solutions – Meeting Hydrocarbon Demand in Changing Times
March 7-10, 2010 – Manama, Bahrain

Gaussian Beam De-Migration and Re-Migration

Jianming Sheng1; Chengbin Peng1

(1) Nexus Geosciences Inc., Sugar Land, TX.

In this abstract we will present a theoretical framework for demigration of seismic image data under the frame work of Gaussian Beam theory. The underlying methodology has no dip limitation and handles multi-valued arrivals well. The practical use of this technology is to perform Previous HitprestackNext Hit demigration of existing image volumes (CIG gathers) followed by Previous HitprestackNext Hit depth remigration using a Previous HitreplacementNext Hit velocity and/or anisotropy model. The result is a fast, accurate, and cost effective way to improved seismic imaging as compared to proprietary reprocessing from field tapes.

Ross Hill published seminal works in common offset Gaussian Beam Previous HitprestackNext Hit depth migration (Hill, 1991 and 2001). Chevron has been largely the only beneficiary of the Gaussian beam technology. To the best of our knowledge there have been no published work on Gaussian beam Previous HitprestackNext Hit demigration.

For example, in Previous HitprestackNext Hit demigration, one can start with an individual common offset image volume (Kirchhoff migration volume, Gaussian beam migration volume, or fast beam migration volume). The single fold image is demigrated to reconstruct the corresponding input unmigrated seismic data. In Gaussian Beam Previous HitprestackNext Hit demigration, we actually reconstruct the individual beams used as input to the original Gaussian Beam migration. The individual beams are then synthesized to form an unmigrated seismic volume.

There are many uses of Gausian Beam Previous HitprestackNext Hit demigration technology. For example, it can be used as a fast forward modeling tool to generate synthetic data for migration and inversion. Another use of this technology is to perform Previous HitprestackNext Hit demigration of existing image data, followed by Previous HitprestackNext Hit depth (re)migration with a Previous HitreplacementTop velocity and/or anisotropy model. This is a faster, more accurate and cost effective way of seismic imaging over proprietary reprocessing from field tapes. Both synthetic and field data examples of this will be shown.