Browsing Earth Resources Laboratory by Title
Now showing items 60-79 of 456
-
Characterizing the Mechanics of Fracturing from Earthquake Source Parameter and Multiplet Analyses: Application to the Soultz-sous-Forêts Hot Dry Rock site
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2005)In 2000 and 2003, two massive hydraulic fracturing experiments were carried out at the European Geothermal Hot Dry Rock site at Soultz-sous-Forêts, France. The objective was to create a dense network of enhanced ... -
Comparison of Discrete Fracture and Effective Media Representation of Fractures on Azimuthal AVO
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2005)In fractured reservoir development, azimuthal AVO (AVOaz) properties of reflected PP waves from reservoir tops are often used to infer fracture properties. The fracture parameter inversion is based on either an effective ... -
A comparison of LWD and wireline dipole sonic data
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2004)Data measured by both wireline and LWD tools in the same borehole are compared. Discrepancies in shear velocities as calculated from the data are on average around 5% and discrepancies between compressional velocities are ... -
Comparison of microearthquake locations using seismic interferometry principles
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)Mapping, localization, and general characterization of problems in reservoir fracture systems is one of the most important in oil, gas, and geothermal energy production. One way to study and monitor these fracture systems ... -
Comparison Of Scattered Energy Using Point Scatterers Versus Full 3D Finite Difference Modeling
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2004)We present results of 3D numerical modeling using a series of simple point scatterers to create synthetic seismic shot records collected over regular, discrete, vertical fracture systems. The background medium is taken to ... -
A Comparison Of Scattering From 2-D And 3-D Rough Interface
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1995)In this paper we compared scattered waves from 2-D and 3-D interface structures. The modeling technique is the 3-D time domain finite difference method. The scheme is second-order accurate in time and fourth-order accurate ... -
Computation of 3D Frequency-Domain Waveform Kernals for c(x,y,z) Media
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2006-05-28)Seismic tomography, as typically practiced on both the exploration, crustal, and global scales, considers only the arrival times of selected sets of phases and relies primarily on WKBJ theory during inversion. Since the ... -
Converted Phase Elastic Migration Velocity Analysis
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2013)Multi-component elastic seismic data collected at large offsets have the potential to be used in seismic imaging and velocity analysis. In this study, we present an approach for converted-phase elastic-transmission migration ... -
Crack Models For A Transversely Anisotropic Medium
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1992)A commonly used model for a transversely anisotropic crack rock is that by Hudson (1980, 1981). This model is based on a simplified analysis of a thin circular crack, with displacement and stress conditions specified on ... -
Crosshole Seismoelectric Measurements in Borehole Models With Fractures
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2002)A seismic wave propagating in a fluid-saturated porous media, moves ions in the double layer between the fluid and solid and induces an electric field. When there is discontinuity (such as a fracture), the seismic wave ... -
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 ...
