Empirical Correlations to Correct Elastic Properties from Dynamic to Static with a Case Study from Southern Iraq

Abstract

This paper aims to create empirical correlations to correct dynamic elastic properties to static properties, which in turn will assist in building a rigorous geomechanical model and attaining wellbore stability in the Yamama formation, Ratawi field, southern Iraq. Real core plugs (2-inch diameter and 4-inch length) to meet the lab standards requirements, were obtained from the Yamama formation to implement tests such as single triaxial tests and acoustic measurements. The static rock properties were obtained based on the laboratory measurements for the axial stress, axial strain, radial strain, volume strain, and confining pressure; while the dynamic rock properties were measured based on ultrasonic laboratory readings for compressional wave velocity (Vp) and shear wave velocity (Vs) as well as lab-measured bulk density. The acquired data revealed that the relationship between static and dynamic Young's modulus (Es and ED) is exponential with an R2 of 0.92 and root mean square error (RMSE) of 0.42; while the relationship between static and dynamic Poisson's ratio (vs and vD) is a second degree polynomial with an R2 of 0.99 and RMSE of 0.0022. Moreover, the relationship between static and dynamic bulk modulus (Ks and KD) is exponential with an R2 of 0.987 and an RMSE of 0.028. The findings elucidated that the proposed empirical correlations have a decent precision. Nevertheless, the reliability of the proposed correlations is subjected to statistics and locality. To sum it, this study revealed promising findings of the utilization of the proposed correlations to create geomechanical models for the Yamama formation, southern Iraq to be used in many applications related to rock mechanics.

Department(s)

Geosciences and Geological and Petroleum Engineering

International Standard Book Number (ISBN)

978-171383912-5

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 American Rock Mechanics Association, All rights reserved.

Publication Date

01 Jan 2021

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