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Detection of Open Fractures with Vertical Seismic Profiling
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1984-01-01)
In Vertical Seismic Profiling surveys tube waves are generated by compressional waves impinging on subsurface fractures or permeable zones. The problem of generation of these waves by a non-normal incident P wave for an ...
Detection Of Subsurface Fractures And Permeable Zones By The Analysis Of Tube Waves
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1983)
In Vertical Seismic Profiling tube waves are generated by compressional
waves impinging on subsurface fractures or permeable zones. The amplitude of
tube waves is dependent upon the formation permeability, the length of ...
Approximate Effects of Off-Center Acoustic Sondes and Elliptic Boreholes Upon Full Waveform Logs
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1983)
Full waveform acoustic well logging has become instrumental to hydrocarbon exploration because of its ability to determine in situ velocity information for P and S waves as well as the attenuation (or absorption) of seismic ...
Analysis of Full Waveform Acoustic Logging Data in "Soft" Formations
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1984)
Direct recording of formation shear wave travel time is not possible in "soft" formations where the shear velocity is lower than the borehole fluid velocity. The borehole Stoneley wave is quite sensitive to changes in ...
Seismic Waves in a Borehole - A Review
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1983)
The propagation of seismic waves in an open borehole is reviewed. The principal wave types are the refracted P and S waves and the two guided waves - pseudo-Rayleigh and Stoneley. The dispersion properties of the guided ...
Report Summary
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1987)
This report contains the results ot work completed during the fifth year of the Full
Waveform Acoustic Logging Consortium in the Earth Resources Laboratory at M.l.T.
During this past year, the emphasis in our research ...
Application of Full Waveform Acoustic Logging Data to the Estimation of Reservoir Permeability
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1984)
Development of borehole geophysics has recently focused on reservoir characterization. Within this effort, extensive full waveform acoustic surveys have demonstrated a correlation between the occurance of open fractures ...
Permeability Estimation from Field Data
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1987)
Strong correlations exist between core measured permeability values and the phase velocity and attenuation of the tube wave obtained from full waveform acoustic logs.
A number of authors have applied the Biot theory to ...
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 ...
Well-to-Well Log Correlation Using Knowledge-Based Systems and Dynamic Depth Warping
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1987)
We present a novel system for well-to-well log correlation using knowledge-based systems
and dynamic depth warping techniques. This approach overcomes a major drawback inherent
in previous methods, namely the difficulty ...