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Dispersion Analysis Of Cross-Dipole Data
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1998)
In this paper, we demonstrate that dispersion analysis of cross-dipole data has promising
potential not only for differentiating stress-induced anisotropy from intrinsic anisotropy, but also for providing information on ...
Fluid Flow In Porous Media: NMR Imaging And Numerical Simulation
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1999)
We use nuclear magnetic resonance (NMR) imaging to obtain a three-dimensional image
of the pore structure in a limestone core, 4.5 mm in diameter and 10 mm in length, with
a resolution of 40 μm. This image is converted ...
Electroseismic Logging For The Detection And Characterization Of Permeable Zones: Field Measurements And Theory
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1998)
A Stoneley wave propagating in a borehole generates pore fluid flow within the permeable
zones intersected by the borehole. In turn, the fluid flow induces a streaming
electrical potential. This electrical potential ...
Azimuthal Offset-Dependent Attributes (AVO And FVO) Applied To Fracture Detection
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1999)
Using the amplitude versus offset (AVO) and the frequency versus offset (FVO) information, the diagnostic ability of P-wave seismic data in fracture detection is investigated. The offset-dependent attributes (AVO and FVO) ...
Variable Grid Finite-Difference Modeling Including Surface Topography
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1999)
We have developed a two-dimensional viscoelastic finite-difference modeling method
for highly complex topography. Realistic modeling of seismic wave propagation in the
near surface is complicated by many factors, such ...
Formation Stress Estimation Using Standard Acoustic Logging
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1999)
In situ formation stress directions and magnitudes are estimated by inverting the borehole flexural and Stoneley dispersions obtained from standard acoustic logging data
(dipole and monopole logs). The underlying procedure ...
Models In LWD Applications
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1999)
A model for a fluid-filled borehole with an LWD tool is used to identify and analyze the
monopole, dipole, and quadrupole modes that are present. The modes can be classified
into three groups and have dispersion behavior ...
Borehole Acoustics and Logging and Reservoir Delineation Consortia
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1997)
Research activity in the Borehole Acoustics and Logging/Reservoir Delineation Consortia
continue to focus on the development of geophysical methods to detect and characterize
geological conditions which control fluid ...
Frequency Dependence Of Seismic Data From Nigeria: Preliminary Results
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1999)
Seismic data from the Niger Delta is used to test processing sequences involved in
prestack and poststack amplitude and frequency analysis of marine seismic data. Water
bottom reverberations are found to present a ...
In Situ Permeability Estimation: A Comparison Between Acoustic And NMR Logs
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1999)
Permeability estimates from acoustic logs (Stoneley waves) and NMR logs were compared
using data from a geologic section consisting of sandstone and shale beds. The
permeability results show very good correlation for ...