Computation of Linear Elastic Properties From Microtomographic Images: Methodology and Agreement Between Theory and Experiment

Published

October 1, 2002

Author(s)

C H. Arns, M A. Knackstedt, W V. Pinczewski, Edward Garboczi

Abstract

Elastic property-porosity relationships are derived directly from microtomographic images. This is illustrated for a suite of 4 samples of Fontainebleau sandstone with porosities ranging from 7.5 % to 22 %. A finite element method is used to derive the elastic properties of digitized images. By estimating and minimizing several sources of numerical error very accurate predictions of properties are derived in excellent agreement with experimental measurements over a wide range of the porosity. We consider the elastic properties of the digitized images under dry, water- and oil-saturated conditions. The observed change in the elastic properties due to fluid substitution is in excellent agreement with the exact Gassmann equations. This shows both the accuracy and the feasibility of combining microtomographic images with elastic calculations to accurately predict petrophysical properties of individual rock morphologies. We compare the numerical predictions to various empirical, effective medium and rigorous approximations used to relate the elastic properties of rocks to porosity under different saturation conditions.

Citation

Geophysics

Volume

67

Issue

No. 5

Pub Type

Journals

Download Paper

Local Download

Keywords

elastic property, finite element, Gassmann, microtomography, petrophysics, porosity, rock morphology, saturation

Citation

Arns, C. , Knackstedt, M. , Pinczewski, W. and Garboczi, E. (2002), Computation of Linear Elastic Properties From Microtomographic Images: Methodology and Agreement Between Theory and Experiment, Geophysics, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=860333 (Accessed April 18, 2024)