Browsing ERL Industry Consortia Technical Reports by Title
Now showing items 426-445 of 456
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Toward The Simulation Of Attenuation: Oscillatory Flow In Porous Rock
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1998)Fluid flow in porous rock due to an oscillatory pressure gradient is simulated. We observe distributions of density and velocity in the rock which point to viscous dissipation. We will use this method to seek a deeper ... -
Towards a Quantitative Understanding of Bed Structure by Turbidity Currents
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2001)We are currently carrying out a series of experiments and theoretical calculations with the goal of creating a quantitative model for the structure of beds created by turbidity currents. Our research project operates on ... -
Transient Fluid Flow In Heterogeneous Porous Media
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1992)A stable Alternating Direction Implicit finite-difference algorithm is used to model transient fluid flow in heterogeneous porous media. In connection with the laboratory system for pressure transient testing of core ... -
Transverserly Isotropic Saturated Porous Formations: 1. Theoretical Developments And (Quasi) Body Wave Properties
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1988)Using the results of homogenization theory, the constitutive equations for an anisotropic porous formation saturated by a Newtonian viscous fluid are derived. The transverse isotropy situation is investigated in terms ... -
Transverserly Isotropic Saturated Porous Formations: II. Wave Propagation And Application To Multipole Logging
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1988)The wavefields generated by monopole and dipole sources in a fluid filled borehole embedded in multilayered transversely isotropic saturated porous formations are studied. The layers are modeled following Biot theory ... -
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 ... -
Tube Wave Generation At A Layer Boundary For An Incident Compressional Plane Wave
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1992)An approximate theory for the scattering of an incident plane P wave into tube waves in a fluid-filled borehole drilled through two homogeneous half-spaces is proposed in this paper. This theory is in excellent agreement ... -
Tube Waves, Seismic Waves And Effective Sources
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1993)A simple asymptotic analysis, based on the smallness of the ratio of the borehole radius to the wavelength, reveals the interaction between tube waves and seismic waves. The pressure field in a tube wave acts as a secondary ... -
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 Time-lapse Image Domain Wavefield Tomography
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2013)Time-lapse 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 Finite-Difference Modeling Including Surface Topography
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1999)We have developed a two-dimensional viscoelastic finite-difference 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 Multi-Receiver Full Waveform Acoustic Logging Data In Open and Cased Holes
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1987)Average semblance and maximum-likelihood 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 Analysis Of Multi-Receiver Full Waveform Acoustic Logging Data In Open And Cased Holes
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1986)Average semblance and maximum-likelihood 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 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 ...
