Velocity images from stacking slowness-depth seismic wavefields

Jones, G. and Barton, P. J. and Singh, S. C. (2007) Velocity images from stacking slowness-depth seismic wavefields. Geophysical Journal International, 168. pp. 583-592. DOI 10.1111/j.1365-246X.2006.03055.x

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Abstract

We present synthetic and real data examples processed using a depth imaging method for long-offset multichannel seismic data via the intercept-time-slowness (τ–p) domain. The refracted and reflected information contained in the wavefield is processed simultaneously. Our scheme uses common midpoint data that is transformed to the τ–p domain and mapped to the depth-slowness (z–p) domain using a downward continuation algorithm. The velocity function for downward continuation may be obtained iteratively from the diving ray trajectory within the slowness-depth wavefield or estimated using an independent method. Horizontal events within the z–p wavefield are isolated by applying a mute function corresponding to the downward continuation velocity function in the z–p domain. Stacking the resulting wavefield gives an image trace that may be superimposed on the velocity function to form a velocity image. Following testing on synthetic data the method is applied to two long-offset marine seismic streamer data sets with offsets up to 18 km, from the northeast Atlantic margin. These examples demonstrate the potential of the method to obtain velocity images in difficult geological locations, where conventional processing has been less successful.

Item Type: Article
Uncontrolled Keywords: 2007 AREP IA49 IA53 2007 P
Subjects: 02 - Geodynamics, Geophysics and Tectonics
Divisions: 02 - Geodynamics, Geophysics and Tectonics
Journal or Publication Title: Geophysical Journal International
Volume: 168
Page Range: pp. 583-592
Identification Number: 10.1111/j.1365-246X.2006.03055.x
Depositing User: Sarah Humbert
Date Deposited: 16 Feb 2009 13:02
Last Modified: 23 Jul 2013 10:07
URI: http://eprints.esc.cam.ac.uk/id/eprint/440

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