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Velocities of compressional and shear waves in limestones and dolomites in a gas field of SW IRAN
ABDOLRAHIM JAVAHERIAN2
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1
Department of Petroleum Engineering, Amirkabir University of Technology, Tehran, Iran.,
2
Institute of Geophysics, University of Tehran, Tehran, Iran.,
JSE 2012, 21(4), 347–359;
Submitted: 10 September 2011 | Accepted: 18 September 2012 | Published: 1 December 2012
© 2012 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
Rastegar, S.A.F. and Javaherian, A,, 2012. Velocities of compressional and shear waves in limestones and dolomites in a gas field of SW Iran. Journal of Seismic Exploration, 21: 347-359. Carbonates are the second important lithologies, after silicates, in petroleum reserves. Using three wells and DSI tools in one of the gas reservoirs in the Persian Gulf, Iran, four equations between compressional and shear wave velocities have been determined for limestones and dolomites. Then, these relationships have been compared with Castagna’s relationships. It is concluded that Castagna’s relationships estimated for Vs are less than the actual values in limestones and dolomites in the area of study. Using different crossplots, the gas and dolomitization effects on seismic velocities are studied. Consequently, understanding the gas and dolomitization effects make it possible to separate gas-saturated zones from water-saturated, and dolomites from limestones.
Keywords
compressional velocity
shear velocity
correlation relationship
gas effect
Poisson’s ratio
dolomitization
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