Browsing Earth Resources Laboratory by Title
Now showing items 53-72 of 456
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Calculation Of Conical (Mach) Wave Displacement Fields Radiated By Borehole Sources In Slow Formations And Inhomogeneous Media
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1993)Stationary phase solutions for the radiation patterns of borehole sources are commonly used to study the far-field seismic wavefields produced in crosshole or reverse VSP experiments, but they break down when the formation ... -
Carbon sequestration monitoring with acoustic double-difference waveform inversion: A case study on SACROC walkaway VSP data
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2011)Geological carbon sequestration involves large-scale injection of carbon dioxide into underground geologic formations and is considered as a potential approach for mitigating global warming. Changes in reservoir properties ... -
Cased Borehole Effect On Downhole Seismic Measurements
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1993)Approximate and exact formulations are presented for the interaction of an incident wave with a cased borehole. In the approximate method, the borehole coupling theory is used to compute pressure in the fluid at a low ... -
Cement Bond Evaluation Using Early Refracted Arrivals
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1997)The cement bond evaluation tool is a device used to examine the integrity of cement bonding to the casing. A conceptual tool operating between 80-200 kHz is considered here, with a transmitter and two receivers, oriented ... -
Characterization of Induced Seismicity in a Petroleum Reservoir: A Case Study
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2005)Fluid production and injection in hydrocarbon and geothermal reservoirs generally results in induced seismic activity. In this paper we study the microseismic activity in a petroleum field in Oman. The microearthquake data ... -
Characterization of Scattered Waves from Fractures by Estimating the Transfer Function Between Reflected Events Above and Below Each Interval
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2003)It is important to be able to detect and characterize naturally occurring fractures in reservoirs using surface seismic reflection data. 3D finite difference elastic modeling is used to create simulated surface seismic ... -
Characterizing Surface Roughness From Pressure-Joint Closure Measurements Using Inversion Procedure
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1991)An inversion procedure has been formulated to estimate the surface roughness of a joint (fracture) from the measured pressure-closure data. A gamma distribution for the local minima (or maxima) on a topography profile ... -
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 ...
