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Browsing Earth Resources Laboratory by Title

Theophanis, Stephen; Zhu, Xiang
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1997)
Vve examine seismic waves scattered from anisotropic heterogeneity with laboratory data
and numerical modeling in order to develop modeling techniques for the characterization
of fracture properties in tight gas sands ...

Toksoz, M. N.; Guler, Fatih
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1987)
A set of ultrasonic experiments was carried out to determine the effects of horizontal and vertical fractures on full waveform acoustic logs. Boreholes of 1 cm diameter were drilled in aluminum blocks. Measurements were ...

Mikhailov, Oleg V.; Queen, John H.; Toksoz, M. Nafi
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1997)
We present a new type of field measurement capable of detecting and characterizing
fractured (permeable) zones intersecting a borehole. The method is based on measuring
electrical fields generated by a borehole Stoneley ...

van Wijk, Kasper; Mikessel, Dylan; Melo, Gabriela; Malcolm, Alison E.
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2010)
Seismic interferometry is a technique used to estimate the
Green’s function (GF) between two receiver locations, as if
there were a source at one of the locations. By crosscorrelating
the recorded seismic signals at the ...

Hayashi, Koichi; Burns, Daniel R.
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1999)
We have developed a twodimensional viscoelastic finitedifference modeling method
for highly complex topography. Realistic modeling of seismic wave propagation in the
near surface is complicated by many factors, such ...

Block, Lisa V.; Cheng, C. H.; Duckworth, Gregory L.
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1987)
Average semblance and maximumlikelihood spectral analyses are applied to synthetic
and field full waveform acoustic logging data to determine formation velocities. Of
particular interest is the ability of these methods ...

Mendelson, Jim; Toksoz, M. N.
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1989)
Using ultrasonic velocity measurements taken over a multiplicity of directions we show
that samples exhibit weak to moderate anisotropy of seismic velocities. We further
define the anisotropic geometry with high resolution ...

Gibson, Richard L. Jr.; Toksoz, M. Nail
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1988)
A model for attenuation of acoustic waves in suspensions is proposed which includes
an energy loss due to viscous fluid flow around spherical particles. The expression
for the complex wavenumber is developed by considering ...

van der Hilst, Robert D.; de Hoop, Maarten V.; Shen, Peng
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2007)
In seismic tomography, the finite frequency content of broadband data leads to interference
effects in the process of medium reconstruction, which are ignored in traditional ray theoretical
implementations. Various ways ...

Kane, Jonathan; Herrmann, Felix; Toksoz, M. Nafi
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2002)
We present a nonlinear method for solving linear inverse problems by thresholding coefficients in the
wavelet domain1. Our method is based on the waveletvaguelette decomposition of Donoho (1992).
Numerical results for ...

Kane, Jonathan; Herrmann, Felix; Toksoz, M. Nafi
(Massachusetts Institute of Technology. Earth Resources Laboratory, 2001)
Solving linear inversion problems in geophysics is a major challenge when dealing with nonstationary
data. Certain nonstationary data sets can be shown to lie in Besov function spaces and are characterized
by their ...

Tang, X. M.; Cheng, C. H.
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1989)
A laboratory experimental study has been carried out to investigate the mode trapping
characteristics of a fluidfilled fracture between two elastic solids. Using a small circular cylindrical receiver of 2.7 mm diameter, ...

Lineman, D. J.; Mendelson, J. D.; Toksoz, M. N.
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1987)
We present a novel system for welltowell log correlation using knowledgebased systems
and dynamic depth warping techniques. This approach overcomes a major drawback inherent
in previous methods, namely the difficulty ...

Cheng, Arthur C. H.
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1996)
This is the second year we have combined the work of the Logging and Reservoir Delineation groups at the Earth Resources Laboratory. In the first part of this report,
we present work related to logging and petrophysics, ...

Tezuka, Kazuhiko; Cheng, C. H.; Tang, X. M.
(Massachusetts Institute of Technology. Earth Resources Laboratory, 1994)
This paper describes a propagator matrix formulation for the problem of the Stoneley
wave propagation in an irregular borehole. This is based on a simple onedimensional
theory that is possible for the low frequency ...