Hurley, MichaelT. and Hempel, Peter (1990) Porosity and Velocity vs. Depth and Effective Stress in Carbonate Sediments. Proceedings of the Ocean Drilling Program: Scientific Results, 115 . pp. 773-777. DOI 10.2973/odp.proc.sr.115.191.1990.

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Abstract

Results from a series of laboratory geotechnical and acoustical tests on carbonate sediments from the Western Indian Ocean are presented. With these data, empirical relationships for variations in porosity (Φ) and compressional and shear wave velocity (Vp and V5), with effective stress (σ'), were established. With an σ' vs. depth (z) profile, nontemperature-corrected empirical equations for V^ and Vs vs. z were then obtained. These data cover cover only the upper 100 m of sediments. An empirical equation for the variation of shear modulus (G) with z is then established. This is shown to be dominated by the variation of Vs with z. The importance of these equations in developing geoacoustical models of the seafloor, which accurately represent in-situ conditions, is assessed. A check of internal consistency was made: values of Vp were calculated with V5 vs. σ' and Φ vs. σ' equations in Gassmann's theory, and comparisons are made with V^ vs. σ' empirical predictions. Uncertainty bounds were calculated for the Gassmann Vp predictions, and it was found that empirical Vp predictions were close to the upper limits of the Gassmann V^ predictions. We therefore concluded that a partial verification of the internal consistency of the empirical equations was demonstrated.

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