Browsing ERL Industry Consortia Technical Reports by Title
Now showing items 139-158 of 456
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Estimation of fracture compliance from tubewaves generated at a fracture intersecting a borehole
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2011)Understanding fracture compliance is important for characterizing fracture networks and for inferring fluid flow in the subsurface. In an attempt to estimate fracture compliance in the field, we developed a new model to ... -
Estimation Of Lithologies And Depositional Facies From Wireline Logs
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1999)We approach the problem of identifying facies from well logs though the use of neural networks that perform vector quantization of input data by competitive learning. The method can be used in either an unsupervised or ... -
Estimation Of Nonorthogonal Shear Wave Polarizations And Shear Wave Velocities From Four-Component Dipole Logs
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1996)Polarizations of split shear waves and flexural borehole waves are most commonly estimated from four-component data using the rotation technique of Alford (1986). This method is limited to the case of the two polarizations ... -
Estimation Of Reservoir Properties From Seismic Data By Smooth Neural Networks
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2000)Traditional joint inversion methods reqnire an a priori prescribed operator that links the reservoir properties to the observed seismic response. The methods also rely on a linearized approach to the solution that makes ... -
Evaluation And Prediction Of Shear Wave Velocities In Soft Marine Sediments
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1989)Shear wave velocities from full waveform acoustic logs were determined at DSDP Site 613 using the spectral ratio inversion method. Discrete shear wave velocities for a 350 meter interval at 0.5-2 meter depth increments ... -
Executive Summary
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2000)During the past year we have continued to make progress on the difficult problems associated with extracting geological information from geophysical data sets. Our research results focus on three major areas of ... -
Executive Summary
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2007)ERL's research activities are focused on integrated reservoir characterization and monitoring. In order to maximize the information we can obtain from geophysical measurements, there are two overarching themes: 1. Utilize ... -
Executive Summary
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2001)Our research results for the past year are divided into two major areas: 1) the quantification and prediction of reservoir heterogeneity and 2) the use of borehole measurements to quantify fluid flow related properties. ... -
Executive Summary
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2002)During the past year, our research effort has continued to focus on borehole acoustics and reservoir characterization. The papers presented at the annual meeting, and those included in this volume, include theoretical ... -
Executive Summary-Characterization Of Reservoir Fluid Flow Properties
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1998)The characterization of subsurface fluid flow is the key to exploration, production, and management of oil, gas, geothermal, and groundwater reservoirs. From a research perspective the question then becomes how can we ... -
Experimental And Finite Difference Modelling Of Borehole Mach Waves
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1992)A series of model experiments are done in the ultrasonic laboratory to study the radiation of downhole sources in a variety of formations. Three models are used in the experiments. They are a lucite model, a lucite model ... -
Experimental and Theoretical Studies of Seismoelectric Effects in Boreholes
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2005)In a fluid-saturated porous formation, an impinging seismic wave induces fluid motion. The motion of fluid relative to the rock frame generates an electric streaming current. This current produces electric and magnetic ... -
Experimental Design Applied to Borehole DC Resistivity
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2007)This article explores various aspects of geophysical experimental design (ED) applied to single-borehole DC resistivity. For resistivity problems, an experiment or survey is defined as the set of electrode configurations ... -
Experimental Determination of Elastic Anisotropy of Berea Sandstone, Chicopee Shale and Chelmsford Granite
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)We use the ultrasonic transmission method to measure P-, SH-, and SV-wave velocities for Chelmsford Granite, Chicopee Shale, and Berea Sandstone in different directions up to 1000 bars confining pressure. The velocity ... -
Experimental Studies of Electrical Fields on a Breaking Rock Sample
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2001)When a rock sample is pressed by a force, the pressure on the crystal lattice generates an electrical field around the quart grains due to the piezoelectric effect. If a rock is saturated by conductive fluid, the relative ... -
Experimental Studies Of Electrokinetic Conversions In A Fluid-Saturated Porous Medium
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1996)The electrokinetic effect in a fluid-saturated porous rock is defined as the coupling and conversion between seismic and electric energies. When seismic waves propagate through a fluid-saturated formation and cause a ... -
Experimental Studies Of Electroseismic Conversion In A Fluid-Saturated Porous Medium
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1997)The coupling between seismic and electromagnetic waves in a fluid-saturated porous medium is essentially controlled by the electrokinetic effect. The inverse effect of the seismoelectric conversion, the electroseismic ... -
Experimental Studies of Multipole Acoustic Logging with Scaled Borehole Models
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2004)A scaled multipole acoustic tool is built for laboratory measurements at ultrasonic frequencies in borehole models. The source with four separate transducers generate monopole, dipole, and quadrupole waves by different ... -
Experimental studies of reflected nearborehole acoustic waves received in borehole models
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2008)Laboratory experiments are performed with an isotropic Lucite borehole model to measure the acoustic wave fields generated by a monopole source in the borehole. The source not only generates acoustic waves propagating ... -
Experimental Studies of Reflections from Single and Multiple-Fractures Using Lucite Models
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2011)Laboratory acoustic measurements are performed with Lucite fracture models to understand the reflection characteristics of a seismic wave in a fracture zone. The fracture models include single fracture, dual fracture, and ...
