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Inversion of Travel Time for Velocity Using Multi-Spacing Sonic Tools
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)
Spatial resolution of sonic logs is greatly affected by the minimum spacing
between receivers. Improvements can be made, however, when the spatial sampling
of the formation is less than the minimum spacing. This paper ...
Tube Wave Attenuation and In-Situ Permeability
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)
The measurement of in-situ permeability is very important in exploration and
production logging. Observed data show that tube wave attenuation in full waveform
acoustic logs is correlated with formation permeability. It ...
Laboratory Measurements of Attenuation in Rocks at Ultrasonic Frequencies
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)
The spectral ratio method is used to calculate the quality factor (Q) in porous
rock samples at ultrasonic frequencies (0.3 - 1.5 MHz). The data were collected
using the pulse transmission technique with aluminum used ...
Experimental Determination of Elastic Anisotropy of Berea Sandstone, Chicopee Shale and Chelmsford Granite
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)
We use the ultrasonic transmission method to measure P-, SH-, and SV-wave
velocities for Chelmsford Granite, Chicopee Shale, and Berea Sandstone in different
directions up to 1000 bars confining pressure. The velocity ...
Energy Partitioning and Attenuation of Guided Waves in a Radially Layered Borehole
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)
Recently published results (Tubman et al., 1984; Baker,. 1984) indicate that
synthetic full waveform acoustic logs generated in cased or damaged boreholes
differ significantly from those generated in an open hole with ...
Full Waveform Acoustic Logging - From Theory To Applications
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)
This report contains results from the third year of the Full Waveform Acoustic
Logging Consortium and rock physics studies at M.J.T. This year marks the completion
of the first phase of the project which has been directed ...
Detection and Characterization of Fractures from Generation of Tube Waves
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)
Field testing has been conducted to evaluate a model which predicts the
permeability and orientation of a permeable zone, in a deep water well in crystalline
rock. Tube waves are generated by seismic P-waves incident on ...
Physical Properties of a Set of Sandstones, III: the Effects Of Fine Grained Pore Filling Material on Compressional Wave Velocity
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)
We have used aspect ratio modeling to explain the measured compressional
wave velocities of twenty different dry sandstone samples with varying clay
contents at a single confining pressure of 0.5 kbar. Velocities of the ...
The Full Waveform Acoustic Log Inversion Problem
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)
This paper presents the full waveform acoustic log inversion problem for a
multisource - multireceiver tool logging a cylindrical fluid-filled borehole. The problem
is formulated in the frequency-depth domain. A priori ...
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 ...