Search
Now showing items 81-90 of 101
Borehole Wave Propagation In Isotropic And Anisotropic Media III: Anisotropic Formation
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1994)
In this paper we extend the 3-D finite difference method to simulate wave propagations in
an anisotropic medium. The scheme is tested in the homogeneous medium. The finite
difference results agree excellently with the ...
Experimental Study Of The Flexural Waves In The Fractured Or Cased Borehole Model
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1994)
The ultrasonic logging is performed with dipole transducers in aluminum and lucite
borehole models to study the propagation of the flexural waves in a fractured or cased
borehole. The experimental results show that the ...
Asymmetric Modes of Elastic Wave Propagation in a Fluid-Filled Borehole
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)
A numerical investigation of asymmetric modes of elastic wave propagation in a
fluid-filled borehole is treated in this paper. The dispersion curves of guided waves
(called flexural waves) and synthetic microseismograms ...
Crack Models For A Transversely Anisotropic Medium
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1992)
A commonly used model for a transversely anisotropic crack rock is that by Hudson
(1980, 1981). This model is based on a simplified analysis of a thin circular crack, with
displacement and stress conditions specified on ...
Untitled
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1994)
This paper describes a propagator matrix formulation for the problem of the Stoneley
wave propagation in an irregular borehole. This is based on a simple one-dimensional
theory that is possible for the low frequency ...
Borehole Stoneley Wave Propagation Across Permeable Structures: Comparison Between Theory And Experiment
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1992)
The attenuation of borehole Stoneley waves across a permeable structure (e.g., fractures
or fracture zone) is correlated with the permeability of the structure. Using a
simplified Biot theory, the structure can be modelled ...
Borehole Wave Propagation In Isotropic And Anisotropic Media I: Finite Difference Method
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1994)
In this paper we developed a 3-D finite difference method to simulate wave propagations
in an isotropic medium. The wave equation is formulated into the first-order hyperbolic
equations by using velocity and stress and ...
Report Summary
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1994)
This report contains the results of work completed during the twelfth year of the Borehole Acoustics and Logging Consortium in the Earth Resources Laboratory at M.LT.
This year we have achieved one of our major goals in ...
Fast Inversion Of Formation Permeability From Stoneley Wave Logs Using A Simplified Blot-Rosenbaum Model
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1994)
This paper describes a fast algorithm for estimating formation permeability from Stoneley
wave logs. The procedure uses a simplified Biot-Rosenbaum model formulation. The
input to the inversion is the Stoneley wave ...
Report Summary
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1986)
This report contains the results of work completed during the fourth year of the Full
Waveform Acoustic Logging Consortium in the Earth Resources Laboratory at M.LT.
This is the first year of the second phase of the ...