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New Applications In The Inversion Of Acoustic Full Waveform Logs - Relating Mode Excitation To Lithology
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1986-01-01)
Existing techniques for the quantitative interpretation of waveform data have been
based on one of two fundamental approaches: 1) simultaneous identification of compressional and shear wave velocities; and 2) least-squares ...
Full Wave Synthetic Acoustic Logs In Saturated Porous Media Part II: Simple Configuration
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1986)
The discrete wavenumber method is used to compute synthetic full waveform acoustic
logs in an axisymmetric fluid-filled borehole surrounded by a porous medium. The two
phase formation is modeled following Biot's theory. ...
Determination Of In-Situ Permeability From Tube Wave Velocity And Attenuation
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1986)
Recent investigations by a number of different authors have shown that the phase velocity
and attenuation of the tube (Stoneley) wave in the borehole is correlated with in situ
permeability. Specifically, velocity decreases ...
Laboratory Borehole Model
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1986)
An experimental method for acquisition offull waveform acoustic logging (FWAL) data
from scaled laboratory borehole/formation models is under development. A spark-gap
source, fabricated in the lab, is used in conjunction ...
Modelling Of Full Waveform Acoustic Logs In Soft Marine Sediments
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1986)
Full waveform acoustic logs obtained from the Deep Sea Drilling Project (DSDP) were
modelled using synthetic full waveform acoustic logs. These synthetic logs were calculated using the discrete wavenumber method. The model ...
Full Wave Synthetic Acoustic Logs In Saturated Porous Media Part Ill: Pore Shape And Pore Geometry Effects
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1986-01-01)
Homogenization theory states that the viscous and mass coupling coefficients of a fully
saturated porous medium depend upon the pore shape and the pore geometry. Using
an approximate formula, the three body wave velocities ...
Fracture Characterization From Attenuation And Generation Of Tube Waves
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1986)
Results are presented from experiments carried out in conjunction with the USGS at
the Hubbard Brook Experimental Forest near Mirror Lake, New Hampshire. The study
focuses on our ability to obtain orientation and ...
Free Pipe Effects On Guided Wave Propagation
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1986)
The effects of free pipe on the pseudo-Rayleigh and Stoneley waves are studied by introducing a fluid annulus between the casing and cement layers of a cased borehole
model. The existence of a fluid annulus region results ...
Full Wave Synthetic Acoustic Logs In Saturated Porous Media Part I: A Review Of Biot's Theory
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1986)
Hydrocarbon exploration is especially concerned with two phase media. Following Biot,
such finite porosity rocks are modeled as statistically isotropic materials composed of a
solid elastic matrix permeated by a network ...
Synthetic Acoustic Logs Over Bed Boundaries And Horizontal Fissures
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1986)
The finite difference method is used to predict the effects of wave propagation in boreholes with vertically varying elastic properties. Specifically horizontal interfaces between rock types (for example shales and sandstones) ...