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Title: A numerical homogenization method for heterogeneous, anisotropic elastic media based on multiscale theory

Abstract

The development of reliable methods for upscaling fine scale models of elastic media has long been an important topic for rock physics and applied seismology. Several effective medium theories have been developed to provide elastic parameters for materials such as finely layered media or randomly oriented or aligned fractures. In such cases, the analytic solutions for upscaled properties can be used for accurate prediction of wave propagation. However, such theories cannot be applied directly to homogenize elastic media with more complex, arbitrary spatial heterogeneity. We therefore propose a numerical homogenization algorithm based on multiscale finite element methods for simulating elastic wave propagation in heterogeneous, anisotropic elastic media. Specifically, our method used multiscale basis functions obtained from a local linear elasticity problem with appropriately defined boundary conditions. Homogenized, effective medium parameters were then computed using these basis functions, and the approach applied a numerical discretization that is similar to the rotated staggered-grid finite difference scheme. Comparisons of the results from our method and from conventional, analytical approaches for finely layered media showed that the homogenization reliably estimated elastic parameters for this simple geometry. Additional tests examined anisotropic models with arbitrary spatial heterogeneity where the average size of the heterogeneities ranged frommore » several centimeters to several meters, and the ratio between the dominant wavelength and the average size of the arbitrary heterogeneities ranged from 10 to 100. Comparisons to finite-difference simulations proved that the numerical homogenization was equally accurate for these complex cases.« less

Authors:
 [1];  [2];  [3];  [3];  [4]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Chinese Univ. of Hong Kong, Shatin (Hong Kong)
  3. Texas A & M Univ., College Station, TX (United States)
  4. Texas A & M Univ., College Station, TX (United States); King Abdullah Univ. of Science and Technology, Thuwal (Saudi Arabia)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1221549
Report Number(s):
LA-UR-15-22499
Journal ID: ISSN 0016-8033
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Geophysics
Additional Journal Information:
Journal Volume: 80; Journal Issue: 4; Journal ID: ISSN 0016-8033
Publisher:
Society of Exploration Geophysicists
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; multiscale; homogenization; anisotropy

Citation Formats

Gao, Kai, Chung, Eric T., Gibson, Richard L., Fu, Shubin, and Efendiev, Yalchin. A numerical homogenization method for heterogeneous, anisotropic elastic media based on multiscale theory. United States: N. p., 2015. Web. doi:10.1190/geo2014-0363.1.
Gao, Kai, Chung, Eric T., Gibson, Richard L., Fu, Shubin, & Efendiev, Yalchin. A numerical homogenization method for heterogeneous, anisotropic elastic media based on multiscale theory. United States. https://doi.org/10.1190/geo2014-0363.1
Gao, Kai, Chung, Eric T., Gibson, Richard L., Fu, Shubin, and Efendiev, Yalchin. Fri . "A numerical homogenization method for heterogeneous, anisotropic elastic media based on multiscale theory". United States. https://doi.org/10.1190/geo2014-0363.1. https://www.osti.gov/servlets/purl/1221549.
@article{osti_1221549,
title = {A numerical homogenization method for heterogeneous, anisotropic elastic media based on multiscale theory},
author = {Gao, Kai and Chung, Eric T. and Gibson, Richard L. and Fu, Shubin and Efendiev, Yalchin},
abstractNote = {The development of reliable methods for upscaling fine scale models of elastic media has long been an important topic for rock physics and applied seismology. Several effective medium theories have been developed to provide elastic parameters for materials such as finely layered media or randomly oriented or aligned fractures. In such cases, the analytic solutions for upscaled properties can be used for accurate prediction of wave propagation. However, such theories cannot be applied directly to homogenize elastic media with more complex, arbitrary spatial heterogeneity. We therefore propose a numerical homogenization algorithm based on multiscale finite element methods for simulating elastic wave propagation in heterogeneous, anisotropic elastic media. Specifically, our method used multiscale basis functions obtained from a local linear elasticity problem with appropriately defined boundary conditions. Homogenized, effective medium parameters were then computed using these basis functions, and the approach applied a numerical discretization that is similar to the rotated staggered-grid finite difference scheme. Comparisons of the results from our method and from conventional, analytical approaches for finely layered media showed that the homogenization reliably estimated elastic parameters for this simple geometry. Additional tests examined anisotropic models with arbitrary spatial heterogeneity where the average size of the heterogeneities ranged from several centimeters to several meters, and the ratio between the dominant wavelength and the average size of the arbitrary heterogeneities ranged from 10 to 100. Comparisons to finite-difference simulations proved that the numerical homogenization was equally accurate for these complex cases.},
doi = {10.1190/geo2014-0363.1},
journal = {Geophysics},
number = 4,
volume = 80,
place = {United States},
year = {Fri Jun 05 00:00:00 EDT 2015},
month = {Fri Jun 05 00:00:00 EDT 2015}
}

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