Browsing Earth Resources Laboratory by Title
Now showing items 313-332 of 456
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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 ... -
Pore Geometry And Permeability Modeling From Pressure Dependence Of Transport Properties In Sandstone
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1989)In this paper, a model of the pore geometry of sandstones is proposed. Three categories of pores are considered: large spherical pores at 4-grain vertices, tube-like throats at 3-grain edges and narrow sheet-like throats ... -
Pore Scale Modeling of Rock Properties and Comparison to Laboratory Measurements
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2009)The microstructure of a porous medium and the physical characteristics of the solid and fluid phases determine the macroscopic transport properties of the medium. The purpose of this paper is to test numerical calculations ... -
Pore-Scale Simulation Of Experimentally Realizable, Oscillatory Flow In Porous Rock
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1999)We report new simulations of oscillating flow in porous rock. Our goal is to better understand the frequency dependence of pore-scale fluid motion, which should ultimately help us to interpret attenuation and electroseismic ... -
Predicting stress-induced anisotropy around a borehole
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)Formation elastic properties near a borehole may be altered from their original state due to the stress concentration around the borehole. This could result in a biased estimation of formation properties but could provide ... -
The propagation and linkage of normal faults: Insights from the Strathspey-Brent-Statfjord fault array, northern North Sea
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2001)Through examination of the scaling relations of faults and the use of seismic stratigraphic techniques, we demonstrate how the temporal and spatial evolution of the fault population in a half-graben basin can be accurately ...
