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Frequency and Scale Effects in the Optimization of Acoustic Waveform Logs
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1983)
Previously formulated scaling laws relating acoustic waveforms in
boreholes to frequency, tool size and borehole diameter were investigated by
repeated logging of the same test interval with different frequencies, and ...
Field Test of a Low-Frequency Sparker Source for Acoustic Waveform Logging
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1984)
Low-frequency acoustic-energy sources for waveform logging have important applications in: 1) Verifying theoretical calculations; 2) generating tube waves in large-diameter boreholes; and 3) providing larger sample volumes ...
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 ...
Experimental Verification of Acoustic Waveform and VSP Seismic Tube Wave Measurements of Fracture Permeability
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1987)
A variety of established and experimental geophysical techniques was used to measure
the vertical distribution of fracture permeability in a 229-meter deep borehole penetrating schist and quartz monzonite near Mirror Lake, ...
A Numerical Investigation of Head Waves and Leaky Modes in Fluid-Filled Boreholes
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)
Although synthetic borehole seismograms routinely can be computed for a wide
range of borehole conditions, the physical nature of shear and compressional head
waves in fluid-filled boreholes is poorly understood. This ...