Browsing ERL Industry Consortia Technical Reports by Title
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Ultrasonic And Numerical Modeling Of Reflections From Simulated Fractured Reservoirs
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1997)Vve examine seismic waves scattered from anisotropic heterogeneity with laboratory data and numerical modeling in order to develop modeling techniques for the characterization of fracture properties in tight gas sands ... 
Ultrasonic Laboratory Study of Full Waveform Acoustic Logs in Boreholes with Fractures
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1987)A set of ultrasonic experiments was carried out to determine the effects of horizontal and vertical fractures on full waveform acoustic logs. Boreholes of 1 cm diameter were drilled in aluminum blocks. Measurements were ... 
A unified Bayesian framework for relative microseismic location
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2013)We study the problem of determining an unknown microseismic event location relative to previously located events using a single monitoring array in a monitoring well. We show that using the available information about the ... 
A unified framework for relative source localization using correlograms
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)We study the problem of determining an unknown event location relative to previously located events using a single monitoring array in a monitoring well. We show that using the available information about the previously ... 
Using Borehole Electroseismic Measurements To Detect And Characterize Fractured (Permeable) Zones
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1997)We present a new type of field measurement capable of detecting and characterizing fractured (permeable) zones intersecting a borehole. The method is based on measuring electrical fields generated by a borehole Stoneley ... 
Using Image Warping for Timelapse Image Domain Wavefield Tomography
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2013)Timelapse seismic data are widely used for monitoring subsurface changes. A quantitative assessment of how reservoir properties have changed allows for better interpretation of fluid substitution and migration during ... 
Using SVD for improved interferometric Green's function retrieval
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2013)Seismic interferometry (SI) is a technique used to estimate the Green’s function (GF) between two receiver locations, as if there were a source at one of the receiver locations. However, in many applications, the requirements ... 
Using SVD for improved interferometric Green’s function recovery.
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2010)Seismic interferometry is a technique used to estimate the Green’s function (GF) between two receiver locations, as if there were a source at one of the locations. By crosscorrelating the recorded seismic signals at the ... 
Variable Grid FiniteDifference Modeling Including Surface Topography
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1999)We have developed a twodimensional viscoelastic finitedifference modeling method for highly complex topography. Realistic modeling of seismic wave propagation in the near surface is complicated by many factors, such ... 
Velocity Analysis Of MultiReceiver Full Waveform Acoustic Logging Data In Open And Cased Holes
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1986)Average semblance and maximumlikelihood spectral analysis are applied to synthetic full waveform acoustic logging data to determine formation velocities. Of particular interest is the ability of these methods to resolve ... 
Velocity Analysis of MultiReceiver Full Waveform Acoustic Logging Data In Open and Cased Holes
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1987)Average semblance and maximumlikelihood spectral analyses are applied to synthetic and field full waveform acoustic logging data to determine formation velocities. Of particular interest is the ability of these methods ... 
Velocity Anisotropy Of Two Deep Crystalline Samples
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1989)Using ultrasonic velocity measurements taken over a multiplicity of directions we show that samples exhibit weak to moderate anisotropy of seismic velocities. We further define the anisotropic geometry with high resolution ... 
Viscous Attenuation Of Acoustic Waves In Suspensions
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1988)A model for attenuation of acoustic waves in suspensions is proposed which includes an energy loss due to viscous fluid flow around spherical particles. The expression for the complex wavenumber is developed by considering ... 
Viscous Fluid Effects on Guided Wave Propagation in a Borehole
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1987)In order to investigate the effect of borehole fluid viscosity on the attenuation and dispersion of the guided waves present in full waveform acoustic logs, the problem of wave propagation in a borehole containing a ... 
Viscous Fluid Effects on Guided Wave Propagation in a Borehole
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1987)In order to investigate the effect of borehole fluid viscosity on the attenuation and dispersion of the guided waves present in full waveform acoustic logs, the problem of wave propagation in a borehole containing a ... 
Visibility Analysis using Reverse Time Wave Sensitivity for TimeLapse TargetOriented Imaging
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2011)Identifying the relationship between surface seismic data and a particular region in the earth, referred to as visibility analysis, is important because it facilitates the optimization of the quality and speed of the imaging ... 
Wave Propagation In A FluidFilled FractureAn Experimental Study
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1989)A laboratory experimental study has been carried out to investigate the mode trapping characteristics of a fluidfilled fracture between two elastic solids. Using a small circular cylindrical receiver of 2.7 mm diameter, ... 
WaveEquation Reflection Tomography: Annihilators and Sensitivity Kernals
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2007)In seismic tomography, the finite frequency content of broadband data leads to interference effects in the process of medium reconstruction, which are ignored in traditional ray theoretical implementations. Various ways ... 
Wavelet Domain Geophysical Inversion
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2002)We present a nonlinear method for solving linear inverse problems by thresholding coefficients in the wavelet domain1. Our method is based on the waveletvaguelette decomposition of Donoho (1992). Numerical results for ... 
Wavelet domain linear inversion with application to well logging
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2001)Solving linear inversion problems in geophysics is a major challenge when dealing with nonstationary data. Certain nonstationary data sets can be shown to lie in Besov function spaces and are characterized by their ...