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Evaluating marine gas-hydrate systems. Part II: Rock physics joint inversion of electrical resistivity and seismic velocities
DIANA SAVA,
BOB HARDAGE,
MIKE DeANGELO,
PAUL MURPHY
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Bureau of Economic Geology, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX 78713, U.S.A.,
JSE 2011, 20(2), 105–118;
Submitted: 12 June 2010 | Accepted: 28 January 2011 | Published: 1 May 2011
© 2011 by the Authors. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution -Noncommercial 4.0 International License (CC-by the license) ( https://creativecommons.org/licenses/by-nc/4.0/ )
Abstract
The methodology for joint inversion presented in this paper uses a Bayesian approach, and combines rock-physics theories and empirical relations with stochastic simulations that were presented in Part f of this 2-paper series. We show examples of estimating gas-hydrate concentration and calculating the uncertainty associated with these estimates using electrical resistivity logs and 4C OBC seismic data across the Green Canyon area of the Gulf of Mexico. At calibration wells, we estimate hydrate concentration by jointly inverting electrical resistivity logs and seismic interval velocities.
Keywords
gas hydrates
rock-physics
elastic properties
modeling
Gulf of Mexico
References
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- DeAngelo, M.V., Murray, P.E., Hardage, B.A. and Remington, R.L., 2008. Integrated 2D 4-C
- OBC seismic velocity analysis of near-seafloor sediments, Green Canyon, Gulf of Mexico.Geophysics, 73: 109-115.
- Sava, D.C. and Hardage, B.A., 2006. Rock physics characterization of hydrate-bearing deepwatersediments. The Leading Edge, 25: 616-619.
- Sava, D.C. and Hardage, B.A., 2010. Evaluating marine gas-hydrate systems, Part I: Stochasticrock-physics models for electrical resistivity and seismic velocities of hydrate-bearingsediments. J. Seismic Explor., 19: 371-386.
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