ARTICLE

Integrated 2D 4-C OBC analysis for estimating hydrate concentrations, Green Canyon, Gulf of Mexico

M.V. DeANGELO D.C. SAVA B.A. HARDAGE P.E. MURRAY
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Bureau of Economic Geology, John A. and Katherine G. Jackson School of Geosciences, The University of Texas at Austin, Austin, Texas 78713-8924, U.S.A.,
JSE 2010, 19(3), 263–278;
Submitted: 9 June 2025 | Revised: 9 June 2025 | Accepted: 9 June 2025 | Published: 9 June 2025
© 2025 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

DeAngelo, M.V., Sava, D.C., Hardage, B.A. and Murray, P.E., 2010. Integrated 2D 4-C OBC analysis for estimating hydrate concentrations, Green Canyon, Gulf of Mexico. Journal of Seismic Exploration, 19: 263-278. A 2D four-component ocean-bottom-cable seismic survey, originally acquired for the exploration of deeper hydrocarbon targets, was used to estimate near-seafloor hydrate concentrations in the Genesis Field, Green Canyon area of the Gulf of Mexico. The high-resolution properties of the P-P and P-SV processed as common-receiver gathers were utilized to image subtle features of near-seafloor geology. Interpretation of depth equivalent events on P-P and P-SV near-offset images constrained Vp/Vs ratios and zero-offset reflection times. These events were used as inputs to create near-seafloor (<600 m below seafloor) compressional-wave and shear-wave interval velocity models. These interval velocities were used with local resistivity logs to estimate hydrate concentration using a statistical joint inversion procedure. This joint inversion method is especially critical for estimating hydrate concentration in deep-water near-seafloor strata because of the lack of sonic log measurements across the hydrate stability zone.

Keywords
hydrate
ocean-bottom-cable
deep-water
inversion
P-P
P-SV
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Journal of Seismic Exploration, Electronic ISSN: 0963-0651 Print ISSN: 0963-0651, Published by AccScience Publishing