Browsing Earth Resources Laboratory by Title
Now showing items 308-327 of 456
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Numerical Modeling of Seismic Wave Propagation at the Micro-Scale in Digitized Sandstone
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2007)In this paper, we first examine the relationship between the relative particle motions of fluids and solids and the seismic signal received when compressional waves propagate through saturated porous materials. We use a ... -
Numerical Modeling of Transport Properties and Comparison to Laboratory Measurements
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2008-06-10)Transport properties, such as permeability and electrical conductivity, are important in many geophysical and petroleum applications. The microstructure of a porous medium and physical characteristics of the solid and ... -
Numerical Simulation Of The Acoustic And Elastic Wavefields Radiated By A Source In A Fluid-Filled Borehole Embedded In A Layered Medium
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1992)We present a method of calculation to simulate the propagation of acoustic and elastic waves generated by a borehole source embedded in a layered medium. The method is formulated as a boundary element technique where the ... -
Numerical simulation of wave-induced fluid flow in digitized porous media using a coupled model with Level Set
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2008)In this paper, we develop a unified mathematical model with velocity as the primary variable for modeling the interaction between incompressible fluid and compressible solid. We numerically solve this problem ... -
A Numerical Study of the Effects of Wave-Induced Fluid Flow in Porous Media: Linear Solver
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2009)In this paper, we present a computational method to simulate wave propagation in porous rocks saturated with Newtonian fluids over a range of frequencies of interest. The method can use a digital representation of a rock ... -
An Object-Oriented System for Full Waveform Data Processing
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1987)A new approach to the processing of sequences of full waveform acoustic logs is investigated. The rationale for this approach is primarily based on the observation that processing and interpretation tasks strongly depend ... -
Off-Center Monopole And Dipole Sources In Fluid-Filled Boreholes
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1996)A variety of seismic testing techniques rely on the use of seismic sources, detectors, or both, placed at some depth below the ground surface; these are often installed within fluid-filled boreholes. The interpretation ... -
One-Way Wave Propagators For Velocity Analysis On Curvilinear Coordinates
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2008)Due to present computational limitations, migration by the one-way wave equation remains an integral tool in seismic exploration. For the realistic interpretation of common image point gathers, it is necessary that migration ... -
Optimal Absorbing Boundary Conditions For Finite Difference Modeling Of Acoustic And Elastic Wave Propagation
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1993)An optimal absorbing boundary condition is designed to model acoustic and elastic wave propagation in 2D and 3D media using the finite difference method. In our method, extrapolation on the artificial boundaries of a ... -
Optimal Experiment Design for Timelapse Tomography: Customizing Crosswell Micro-Arrays for Monitoring Applications
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2007-05-07)Geophysical monitoring techniques offer the only approach capable of assessing both the spatial and temporal dynamics of subsurface fluid processes. Historically, monitoring datasets have consisted of surveys sequentially ... -
Orientation Estimation for Multiple Large Fractures by Scattering Energy
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2006)We have done the numerical modeling of seismic response to multiple sets of vertical large fractures by using finite-difference method (FD), which can easily handle media with monoclinic anisotropy. We consider three types ... -
P And S Wave Velocity Determination
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1983)There are three general methods that can be used to determine formation velocities from full waveform logs. The first approach is to make use of the data from the entire waveform. This type of velocity analysis is performed ... -
P and SV waves 3-D Numerical Modeling of AVOA from Heterogeneous Fractured Reservoirs
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1997)We study the effects of fracture-induced anisotropy and lateral fracture density heterogeneity on the reflected P and SV wave amplitude variation with offset and azimuth (AVOA), using 3-D finite-difference simulations. The ... -
Passive Seismic Tomography Using Induced Seismicity at a Petroleum Field in Oman
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2009-05-19)A borehole network consisting of 5 monitoring wells was used to monitor the induced seismicity at a producing petroleum field for a period of about 11 months. Nearly 5400 microseismic events were analyzed and utilized ... -
Permeability Estimation from Field Data
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1987)Strong correlations exist between core measured permeability values and the phase velocity and attenuation of the tube wave obtained from full waveform acoustic logs. A number of authors have applied the Biot theory to ... -
Permeability Estimation From Velocity Anisotropy In Fractured Rock
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1989)Cracks in a rock mass subjected to a uniaxial stress will be preferentially closed depending on the angle between the fracture normal and the direction of the applied stress. If the prestress fracture distribution is ... -
Permeability Estimation From Velocity Anisotropy In Fractured Rock
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1990)Cracks in a rock mass subjected to a uniaxial stress will be preferentially closed depending on the angle between the fracture normal vectors and the direction of the applied stress. If the prestress fracture orientation ... -
Petroleum Source Rock Logging
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)Regional distributions of organic content are an important aid in developing basin evolution and hydrocarbon generation models. An approach to evaluate hydrocarbon source rocks using resistivity, sonic, density, neutron ... -
Physical Properties of a Set of Sandstones, III: the Effects Of Fine Grained Pore Filling Material on Compressional Wave Velocity
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)We have used aspect ratio modeling to explain the measured compressional wave velocities of twenty different dry sandstone samples with varying clay contents at a single confining pressure of 0.5 kbar. Velocities of the ... -
Polarization Of Flexural Waves In An Anisotropic Borehole Model
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1995)Two modes of flexural waves can be generated by a dipole source in an anisotropic borehole. Their velocities are related to those of the fast and slow shear waves in the formation. The particle motions and the polarization ...
