Experimental determination of the biot elastic constant: applications in formation evaluation (sonic porosity, rock strength, earth stresses and sanding predictions)

T. Klimentos*, A. Harouaka, B. Mtawaa, S. Saner

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

2 Scopus citations

Abstract

An experimental method has been developed to obtain the 'Biot elastic constant' of rocks from laboratory acoustic measurements. The dynamic and static moduli of actual reservoir sandstone core samples, jacketed and mounted in a triaxial cell under high vacuum (< 0.15 mbar), were measured at various confining and overburden pressures. The vacuum which was obtained in-situ and maintained till the end of the experiment represents the dry skeletal frame of the rock. The bulk modulus of the dry skeletal frame of the rock (Ksk) was calculated using the measured compressional (P-) and shear (S-) wave velocities of the vacuum-dry rock while the rock matrix bulk modulus (Ks) was estimated by averaging the harmonic and arithmetic means of the constituent pure mineral moduli. Results show that the Biot elastic constant is a complex function of porosity, permeability, clay content, pore-size distribution and overburden and confining pressure.

Original languageEnglish
Pages673-687
Number of pages15
StatePublished - 1995

ASJC Scopus subject areas

  • Fuel Technology
  • Energy Engineering and Power Technology

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