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Volume 72, Issue 2
  • E-ISSN: 1365-2478
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Abstract

Abstract

In this paper, we present a frequency‐domain volume integral method to model the microseismic wavefield in heterogeneous anisotropic‐elastic media. The elastic wave equation is written as an integral equation of the Lippmann–Schwinger type, and the seismic source is represented as a general moment tensor. The actual medium is split into a background medium and a scattered medium. The background part of the displacement field is computed analytically, but the scattered part requires a numerical solution. The existing matrix‐based implementation of the integral equation is computationally inefficient to model the wavefield in three‐dimensional earth. An integral equation for the particle displacement is, hence, formulated in a matrix‐free manner through the application of the Fourier transform. The biconjugate gradient stabilized method is used to iteratively obtain the solution of this equation. The integral equation method is naturally target oriented, and it is not necessary to fully discretize the model. This is very helpful in the microseismic wavefield computation at receivers in the borehole in many cases; say, for example, we want to focus only on the fluid injection zone in the reservoir–overburden system and not on the whole subsurface region. Additionally, the integral equation system matrix has a low condition number. This provides us flexibility in the selection of the grid size, especially at low frequencies for given wave velocities. Considering all these factors, we apply the numerical scheme to three different models in order of increasing geological complexity. We obtain the elastic displacement fields corresponding to the different types of moment tensor sources, which prove the utility of this method in microseismic. The generated synthetic data are intended to be used in inversion for the microseismic source and model parameters.

© 2024 European Association of Geoscientists & Engineers. © 2023 The Authors. Geophysical Prospecting published by John Wiley & Sons Ltd on behalf of European Association of Geoscientists & Engineers
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2024-01-30
2025-07-14

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/content/journals/10.1111/1365-2478.13416
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Microseismic wavefield modelling in anisotropic elastic media using integral equation method
Geophysical Prospecting 72, 403 (2024); https://doi.org/10.1111/1365-2478.13416
/content/journals/10.1111/1365-2478.13416
/content/journals/10.1111/1365-2478.13416
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  • Article Type: Research Article
Keyword(s): anisotropy; elastics; full waveform; modelling; seismics; wave

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