Browsing ERL Industry Consortia Technical Reports by Title
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FrequencyDependent Streaming Potentialsw
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2002)An experimental apparatus and data acquisition system was constructed to measure the streaming potential coupling coefficients as a function of frequency. The purpose of the experiments was to measure, for the first ... 
FrequencyDomain FiniteDifference Acoustic Modeling with Free Surface Topography using Embedded Boundary Method
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2010)In this paper, we present a method to model acoustic wave propagation in the frequencydomain in the presence of free surface topography using the embedded boundary method. The advantage of this method is to solve for the ... 
FrequencyDomain Modeling Techniques for the Scalar Wave Equation : An Introduction
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2005)Frequencydomain finitedifference (FDFD) modeling offers several advantages over traditional timedomain methods when simulating seismic wave propagation, including a convenient formulation within the context of wavefield ... 
Full Wave Logging In An Irregular Borehole
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1988)We present a boundary integral equation formulation for the problem of wave propagation in a borehole of irregular crosssection. The method consists in representing the wave field diffracted at the boreholerock interface ... 
Full Wave Synthetic Acoustic Logs In Saturated Porous Media Part I: A Review Of Biot's Theory
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1986)Hydrocarbon exploration is especially concerned with two phase media. Following Biot, such finite porosity rocks are modeled as statistically isotropic materials composed of a solid elastic matrix permeated by a network ... 
Full Wave Synthetic Acoustic Logs In Saturated Porous Media Part II: Simple Configuration
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1986)The discrete wavenumber method is used to compute synthetic full waveform acoustic logs in an axisymmetric fluidfilled borehole surrounded by a porous medium. The two phase formation is modeled following Biot's theory. ... 
Full Wave Synthetic Acoustic Logs In Saturated Porous Media Part Ill: Pore Shape And Pore Geometry Effects
(Massachusetts Institute of Technology. Earth Resources Laboratory, 19860101)Homogenization theory states that the viscous and mass coupling coefficients of a fully saturated porous medium depend upon the pore shape and the pore geometry. Using an approximate formula, the three body wave velocities ... 
The Full Waveform Acoustic Log Inversion Problem
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)This paper presents the full waveform acoustic log inversion problem for a multisource  multireceiver tool logging a cylindrical fluidfilled borehole. The problem is formulated in the frequencydepth domain. A priori ... 
Full Waveform Acoustic Logging  From Theory To Applications
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)This report contains results from the third year of the Full Waveform Acoustic Logging Consortium and rock physics studies at M.J.T. This year marks the completion of the first phase of the project which has been directed ... 
Full Waveform Acoustic Logging  Where We Are, Where We Are Going
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1984)We have now completed the second year of the Full Waveform Acoustic Logging Consortium. During these two years, we have developed a good understanding of seismic wave propagation in a borehole through both theoretical ... 
Full Waveform Inversion of P Waves for V[subscript s] and Q[subscript p]
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1987)We present an indirect method of determining shear wave velocities from full waveform acoustic logs based on the inversion of the spectral ratio of the Pwave trains at two sourcereceiver separations. This method ... 
Fullwaveform Based Complete Moment Tensor Inversion and Stress Estimation from Downhole Microseismic Data for Hydrofracture Monitoring
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2011)Downhole microseismics has gained increasing popularity in recent years as a way to characterize hydraulic fracturing and to estimate insitu stress state. Conventional approaches only utilize part of the information ... 
Fullwaveform Based Microseismic Event Detection and Signal Enhancement: The Subspace Approach
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2013)Microseismic monitoring has proven to be an invaluable tool for optimizing hydraulic fracturing stimulations and monitoring reservoir changes. The signal to noise ratio (SNR) of the recorded microseismic data varies ... 
Fullwaveform Based Microseismic Source Mechanism Studies in the Barnett Shale: Linking Microseismicity to Reservoir Geomechanics
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2013)Microseismic moment tensor (MT) contains important information on the reservoir and fracturing mechanisms. Difficulties arise when attempting to retrieve complete MT with conventional amplitude inversion methods if only ... 
Geomechanical Modeling of InSitu Stresses Around a Borehole
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2002)In this paper, we present a modelling of the insitu stress state associated with the severe hole enlargement of a wellbore. Geomechanical information is relevant to assure wellbore stability, i.e., to prevent damages ... 
Geophysical Monitoring of Multiple Phase Saturation of Rocks: Application to CO[subscript 2] Sequestration
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2011)4D seismic techniques rely on measuring changes in velocity over time in order to detect changes during activities such as CO[subscript 2] flooding and storage in a reservoir. Wang et al. [1998] detail a laboratory study ... 
Geophysical WellLog Analysis In Characterizing The Hydrology Of Crystalline Rocks Of The Canadian Shield
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1988)A full suite of geophysical logs, including nuclear, electric, acoustic transittime, acoustic waveform, and acoustic televiewer logs, and highresolution flowmeter measurements have been used to investigate the lithologic ... 
Geostatistical Seismic Inversion Using Well Log Constraints
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1999)Information about reservoir properties usually comes from two sources: seismic data and well logs. The former provide an indirect, low resolution image of rock velocity and density. The latter provide direct, high ... 
Geostatistically Constrained Seismic Deconvolution
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2002)We present a method for combining seismic deconvolution and geostatistical interpolation. Both problems are posed as a single joint inverse problem in the maximum likelihood framework. Joint inversion allows for well ... 
Guided Waves In Slight, Azimuthally Anisotropic Formations
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1989)A method of calculating dispersion curves for guided waves in slight, azimuthally anisotropic formations is developed with perturbation theory. The fluid is assumed to be inviscid, the formation perfectly elastic and ...