Browsing ERL Industry Consortia Technical Reports by Title
Now showing items 70-89 of 456
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Data-Driven Estimation of the Sensitivity of Target-Oriented Time-Lapse Seismic Imaging to Source Geometry
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)The goal of time-lapse imaging is to identify and characterize regions in which the earth's material properties have changed between surveys. This requires an effective deployment of sources and receivers to monitor the ... -
Decomposition And Particle Motion Of The Acoustic Dipole Log In Anisotropic Formation
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1995)For linear wave propagation in anisotropic media, the principle of superposition still holds. The decomposition of the acoustic dipole log is based on this principle. In the forward decomposition inline and crossline ... -
Deep Resistivity Tomographic Imaging of The Qualibou Caldera, Saint Lucia
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2003)The Qualibou Caldera has been studied since the 1970’s for possible development of geothermal power generation. In 1974 dipole-dipole resistivity measurements were performed in the area. The apparent resistivity data was ... -
Detecting medium changes from coda by interferometry
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2010)In many applications, sequestering CO[subscript 2] underground for example, determining whether or not the medium has changed is of primary importance, with secondary goals of locating and quantifying that change. We ... -
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 ... -
Detection Of Fracture Orientation Using Azimuthal Variation Of P-Wave Avo Responses
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1997)Azimuthally-dependent P-wave AVO (amplitude variation with offset) responses can be related to open fracture orientation and have been suggested as a geophysical tool to identify fracture orientation in fractured oil and ... -
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 ... -
Determination of Formation Properties in Cased Boreholes Using Full Waveform Acoustic Logs
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1984)Wave propagation in bonded and unbonded cased boreholes is examined through the calculation cif synthetic full waveform acoustic logs. The models consist of a central fluid borehole surrounded by a number of fluid and solid ... -
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 ... -
Determination of Near-Surface Anisotropy From Surface Electromagnetic Data
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2001)Ground penetrating radar (GPR) signatures, such as reflection moveout, are sensitive to the presence of azimuthal anisotropy. Azimuthal anisotropy can occur as an intrinsic property of the medium and/or due to the presence ... -
Determination of Shear Wave Velocities in "Slow" Formations
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1983)Direct determination of formation shear wave travel time is impossible in "slow" formations where the shear wave velocity is lower than the borehole fluid (mud) velocity. However, the Stoneley waves in these formations are ... -
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 ... -
Determination Of The Orientation Of Open Fractures From Hydrophone VSP
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1995)Open fractures are of interest in many areas such as ground water contamination, hazardous waste disposal, oil and gas recovery, and geothermal energy extraction. In borehole geophysics and engineering, fractures are ... -
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 ... -
Diffusive MASS NMR Studies of Transport in Porous Materials
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2001)NMR methods are widely used to probe the structure and fluid dynamics of porous materials including such diverse materials as cheese and chocolate, cosmetics and pharmaceuticals, solvents in resins and soft matter, biological ... -
Dispersion Analysis Of Cross-Dipole Data
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1998)In this paper, we demonstrate that dispersion analysis of cross-dipole data has promising potential not only for differentiating stress-induced anisotropy from intrinsic anisotropy, but also for providing information on ... -
Dispersion Analysis Of Split Flexural Waves
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1997)In this paper we first present a technique for measuring dispersion curves from array data, that is both simple and efficient. We demonstrate its performance on both synthetic and field data. We then use the technique to ... -
Dispersion Curves and Synthetic Microseismograms in Unbonded Cased Boreholes
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1984)The dispersion relations and impulse response. are calculated for a geometry consisting of an arbitrary number of coaxial annuli surrounding a central cylinder. The annuli may be either solid or fluid. The formulation ... -
Dispersive Wave Analysis – Method and Applications
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2005)A technique for estimating the dispersion characteristics of propagating waves as measured by an array is detailed. The technique consists of bandpass filtering the data through a filterbank and then processing the filtered ...
