The effect of velocity uncertainty on migrated reflectors: Improvements from relative-depth imaging
Name
Poliannikov-2016-Effect of velocity.pdf
Size
681.01 KB
Format
Adobe PDF
Checksum (MD5)
51bea9aef31f44eb1068f09524961559
Author(s)
Poliannikov, Oleg V.
Malcolm, Alison E.
Date Issued
November 2015
Journal
GEOPHYSICS
Publisher
Society of Exploration Geophysicists
Citation
Poliannikov, Oleg V., and Alison E. Malcolm. “The Effect of Velocity Uncertainty on Migrated Reflectors: Improvements from Relative-Depth Imaging.” GEOPHYSICS 81, no. 1 (November 6, 2015): S21–S29. © 2015 Society of Exploration Geophysicists
Version
Final published version
Abstract
We have studied the problem of uncertainty quantification for migrated images. A traditional migrated image contains deterministic reconstructions of subsurface structures. However, input parameters used in migration, such as reflection data and a velocity model, are inherently uncertain. This uncertainty is carried through to the migrated images. We have used Bayesian analysis to quantify the uncertainty of the migrated structures by constructing a joint statistical distribution of the location of these structures. From this distribution, we could deduce the uncertainty in any quantity derived from these structures. We have developed the proposed framework using a simple model with velocity uncertainty in the overburden, and we estimated the absolute positions of the horizons and the relative depth of one horizon with respect to another. By quantifying the difference in the corresponding uncertainties, we found that, in this case, the relative depths of the structures could be estimated much better than their absolute depths. This analysis justifies redatuming below an uncertain overburden for the purposes of the uncertainty reduction.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1190/GEO2014-0604.1
