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Measurements Of Shear-Wave Azimuthal Anisotropy From Ultrasonic Dipole Data
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1995)
Four methods for analyzing azimuthal anisotropy from dipole logging data are described
and attempted in this paper. These techniques are based on the phenomena of flexural
wave splitting in anisotropic materials and are ...
Decomposition And Particle Motion Of The Acoustic Dipole Log In Anisotropic Formation
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1995)
For linear wave propagation in anisotropic media, the principle of superposition still
holds. The decomposition of the acoustic dipole log is based on this principle. In the
forward decomposition inline and crossline ...
An Amplitude And Traveltime Calculation Using A Higher-Order Parabolic Equation
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1996)
A higher-order parabolic equation is used to compute the traveltime (phase) and the
amplitude in constant density acoustic media. This approach is in the frequency domain,
thereby avoiding the high frequency approximation ...
A Comparison Of Scattering From 2-D And 3-D Rough Interface
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1995)
In this paper we compared scattered waves from 2-D and 3-D interface structures. The
modeling technique is the 3-D time domain finite difference method. The scheme is
second-order accurate in time and fourth-order accurate ...
A Time-Domain Finite-Difference Method With Attenuation By A Recursive Algorithm
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1996)
A recursive algorithm to incorporate attenuation into a time-domain finite-difference
calculation is developed. First, a rheological model of the generalized Maxwell body
is chosen. The discrete relaxation frequency and ...