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Acoustic 2D modeling to determine the influence of aspect ratio and pore orientation on the acoustic properties of the rockNormal access

Authors: V. Khalimendik and I. Virshylo
Event name: 17th International Conference on Geoinformatics - Theoretical and Applied Aspects
Session: Mathematical Methods and Computer Technologies in Geophysics and Geology
Publication date: 14 May 2018
DOI: 10.3997/2214-4609.201801803
Language: Russian
Info: Extended abstract, PDF ( 1.24Mb )
Price: € 20

Summary:
This paper describes the study of the results of acoustic 2D modeling to determine the influence of the shape, aspect ratio and orientation of pores on the acoustic properties of the rock. The size of the model for acoustic modeling is set by the size of the acoustic probe. To implement the modeling procedure in the “Tesseral ” software package, the model dimension was scaled so that the 0.1 mm voids occupied one grid cell, i.e. increased 10^4 times. Presented results of calculation of three models of sandstone with homogeneous composition of voids filled with water. The first model is filled by discs with 1 mm diameter, the second and tritium – by cracks with 1 mm diameter and 10 mm length, it oriented along and, respectively, across the wave propagation. The result of 2D modeling demonstrates that the different shape and orientation of voids in the matrix of the geological environment have different effects on its acoustic properties. Especially noticeable is the difference between the voids round shape and elongated in the direction of the wave propagation. These geometries significantly reduce the acoustic properties of the simulated environment. The opposite trend is observed between the voids of circular shape and elongated across the direction of the wave.


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