Interpretation of sonic logging data acquired in environments with complex anisotropy is a difficult problem attracting the attention of researchers and the oil industry. The capability for fast and accurate numerical modeling is needed to better understand the physics of wave propagation in highly anisotropic medium and be able to explain observations from field data. To address this challenge, we developed an efficient and accurate numerical algorithm for the simulation of sonic logging experiments in a highly anisotropic formation. The basis of the approach is a heterogeneous spectral element method implemented on multi-GPU array applied to the acoustic-elastic wave equation. The approach was designed to simulate wave propagation in 3D arbitrary anisotropic elastic media with attenuation for a constant quality factor via a standard linear solid using the tau-method. Combined with the use of an unstructured grid, the spectral element algorithm enables handling tools in a fluid-filled borehole with surrounding geological models of high complexity. Several log simulations for deviated wells in vertically transverse isotropic formations for monopole, dipole and quadrupole source symmetries were compared with field data. Correspondence between the simulations and field data supports a better understanding of complex wave propagation.
|Journal||Proceedings of Meetings on Acoustics|
|Publication status||Published - 2013|
|Event||21st International Congress on Acoustics, ICA 2013 - 165th Meeting of the Acoustical Society of America - Montreal, QC, Canada|
Duration: 2 Jun 2013 → 7 Jun 2013