Equivalent porous medium for modeling of the elastic and the sonic properties of sandstones

Sang, Nguyen Xuan; Vu, Minh‐Ngoc

doi:10.1016/j.jappgeo.2015.06.004

Cited by 7 publications

(2 citation statements)

References 45 publications

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“…Natural GHBS corresponds to a value in between these limits. Indeed, Nguyen et al (2015) showed that an uncemented sand packing with a given porosity is as weak as a cemented one with a porosity of about 2 .…”

Section: Discussionmentioning

confidence: 99%

A model to predict the elastic properties of gas hydrate-bearing sediments

Nguyen‐Sy

Tang

et al. 2019

Journal of Applied Geophysics

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A simple and accurate model for predicting the elastic properties of gas hydratebearing sediment (GHBS) is proposed and validated against experimental data. It is developed on the basis of the homogenization theory for multiphase composite. Unlike the classical homogenization techniques those fix a homogenization scheme (e.g. self-consistent, Mori-Tanaka, DEM, etc.) for a given microstructure, the proposed model considers a flexible homogenization scheme that adapts with the change of the microstructure of the material. The idea is to modify the elastic properties of the reference matrix with respect to the microstructure change of the mixture. Such modification is ensured by adapting the theoretical method to available experimental data. The derived method is proved to be very powerful as it can fit laboratory measured data on gas hydrate-bearing sand formed by different methods including excess gas and excess water methods and log data taken from various sites. Such feature cannot be satisfied by the existent models those consider the hydrate phase as a cement phase or a porefilling phase. A very good agreement between the proposed method and experimental data offer a simple and accurate ways to predict the saturation of gas hydrate using sonic log data or 3D seismic data.

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Section: Discussionmentioning

confidence: 99%

A model to predict the elastic properties of gas hydrate-bearing sediments

Nguyen‐Sy

Tang

et al. 2019

Journal of Applied Geophysics

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“…Field measurement (e.g. log well technique) allows measuring the elastic properties (compres-sional and shear ultrasonic wave velocities) of the host rock (Nguyen et al, 2015(Nguyen et al, , 2017. However, laboratory test on the sample, including drained, undrained, pore pressure loading and unjacketed tests, must be had recourse to determine the complete poroelastic properties (Lion et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Two-step Homogenization of Poroelastic Properties of a Limestone

Trieu¹,

Bien²,

Tho³

et al. 2020

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This study aims at deriving the effective poroelastic properties of the oolitic limestones based on the Hashin composite sphere assemblage (CSA) micromechanical theory. The microstructure of oolitic limestones generally exhibits an assemblage of grains (oolites) surrounded by a matrix. Grain and matrix are linked via the interfacial transition zone (ITZ). Pores exist in these three material phases (oolite, ITZ and matrix). A two-step homogenization method is proposed. The first step consists of upscaling the properties of each porous phase (i.e. porous oolite, porous ITZ and porous matrix) in which each phase contains two sub-phases including pore and solid. The differential self-consistent scheme is used for the first step. At the second step, the three different porous constituents (oolite, ITZ and matrix) are assembled in a CSA model. A mathematical analogy between thermoelasticity and poroelasticity is used to obtain the effective poroelastic properties. A comparison between the proposed model and test data on the oolitic limestone from Bourgogne (France) helps to calibrate the model parameters and to highlight the role of ITZ phase.

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