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Determination of Shear Wave Velocity and Attenuation From Waveforms in Low Velocity Formations
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1984)
In boreholes where formation shear velocity is lower than borehole fluid velocity neither refracted shear waves nor pseudo-Rayleigh waves can propagate. When frequency response of the sonde does not extend to low frequencies ...
Laboratory Studies Of The Acoustic Properties Of Samples From The Salton Sea Scientific Drilling Project And Their Relation To Microstructure And Field Measurements
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1988)
Compressional and shear wave velocities were measured at confining pressures up to
200 MPa for twelve core samples from the depth interval of 600 to 2600 m in the California State 2-14 borehole. Samples were selected to ...
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 ...
Determining Shear Wave Velocities in Soft Marine Sediments
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1987)
The inversion technique presented in this volume (Cheng, 1987) that simultaneously
inverts full waveform acoustic logs for shear wave velocity (V[subscript 3]) and compressional wave attenuation (Q[subscript p]) was applied ...
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 ...
Evaluation And Prediction Of Shear Wave Velocities In Soft Marine Sediments
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1989)
Shear wave velocities from full waveform acoustic logs were determined at DSDP Site
613 using the spectral ratio inversion method. Discrete shear wave velocities for a 350
meter interval at 0.5-2 meter depth increments ...
Sandstone Pore Aspect Ratio Spectra from Direct Observations and Velocity Inversion
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)
Measurements of pore shapes from Scanning Electron Microscope (SEM) images
for three sandstone samples (the Navajo Sandstone, the Weber Sandstone, and the
Kayenta Sandstone) are compared to the aspect ratio spectra ...