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Vs Prediction in Unconsolidated Sands – Physical and Geological Controls on Shear Wave VelocitiesNormal access

Authors: N. H. Mondol, P. Avseth, M. Fawad and T. Smith
Event name: 72nd EAGE Conference and Exhibition incorporating SPE EUROPEC 2010
Session: Rock Physics 2 (EAGE)
Publication date: 14 June 2010
DOI: 10.3997/2214-4609.201401219
Organisations: SPE, EAGE
Language: English
Info: Extended abstract, PDF ( 595.01Kb )
Price: € 20

Summary:
Vp-Vs relations play a key role in lithology and pore fluid prediction from both sonic and seismic data. Shear wave velocities are required as input to AVO modelling and analysis and for standard fluid substitution using Gassmann equation. Shear waves are almost unaffected by pore fluid changes, as opposed to compressional waves. Hence, Vp-Vs relations are useful fluid indicators. Furthermore, Vp-Vs relations will be diagnostic of lithology and cement volume since different lithologies and amount of cements will have different trends in the Vp versus Vs plane.


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