Special Issue on Advanced Computational Methods for Wave Motion in Complex Media; Guest Editors: Dan Givoli and Géza SerianiNo Access

3D FINITE DIFFERENCE SIMULATIONS OF ACOUSTIC LOGS IN TILTED LAYERED POROUS FORMATIONS

XIAO HE

State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing, 100190, P. R. China

21, Northern 4th Ring Rd West, Haidian District, Beijing, 100190, China.

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XIUMING WANG

State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing, 100190, P. R. China

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, and

HAO CHEN

State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing, 100190, P. R. China

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https://doi.org/10.1142/S0218396X12400097Cited by:6 (Source: Crossref)

Abstract

A finite-difference algorithm is developed in the 3D cylindrical coordinate system. Synthetic waveforms excited by monopole and dipole acoustic sources are calculated for acoustic logging in a tilted layered formation composed of two poroelastic media. It is revealed that the existence of a tilted layer drives more acoustic energy out and therefore reduces the reflection back to the wellbore. Numerical results show that the amplitudes and the arrival times of the shear waves and flexural modes are influenced by the borehole inclination. The Stoneley modes, however, show little sensitivity to the orientation of the layer interface.

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