Basis For Interpretation of Vp/Vs Ratios In Complex Lithologies

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Raymond L. Eastwood, John P. Castagna,
ARCO Oil and Gas Ccmpany

SPWLA TWENTY-FOURTH ANNUAL LOGGING SYMPOSIUM, JUNE 27-30, 1983

1983

Abstract

This paper explains a systematic basis for interpretation of sonic data, especially Vp/Vs ratios, from full waveform sonic logs in complex litholo- gies. The Toksoz model (Kuster and Toksoz, 1974a,b; Toksoz, Cheng and Timur, 1976) for calculating effective bulk modulus and rigidity of art ag- gregate provides this basis and yields Vp, Vs, and Vp/Vs ratios that compare favorably with established laboratory data and results from full waveform sonic logs. Thus, the Toksoz model can be used to compare results for which interpretation experience is lacking.