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Browsing Earth Resources Laboratory by Title
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(Massachusetts Institute of Technology. Earth Resources Laboratory, 1996)In recent years, borehole Stoneley wave amplitude and reflectivity have been used for estimating formation permeability based on the strong correlation between Stoneley wave attenuation, reflectivity and formation fluid ...
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(Massachusetts Institute of Technology. Earth Resources Laboratory, 1991)A detailed study is carried out to investigate the effects of an acoustic logging tool on the propagation characteristics of Stoneley waves in both elastic and porous formations. In an elastic formation, the presence of ...
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(Massachusetts Institute of Technology. Earth Resources Laboratory, 1990)The effects of anisotropy upon elastic wave propagation along a fluid-filled cylindrical borehole are determined. The wave equation is solved in the frequency-wavenumber domain with a variational method, and the solution ...
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(Massachusetts Institute of Technology. Earth Resources Laboratory, 2003)Recent logging tools have monopole and dipole sources in one system, and the monopole and dipole components are acquired by adding or subtracting responses at four monopole (pressure) receiver arrays at right angles. We ...
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(Massachusetts Institute of Technology. Earth Resources Laboratory, 1983)A general expression is derived for the dispersion relations and the impulse response of a radially layered borehole. The. model geometry consists of a central fluid cylinder surrounded by an arbitrary number of solid ...
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(Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)Laboratory measurements of ultrasonic p- and S-wave velocities were made as a function of confining pressure for vacuum dry, benzene-, and water-saturated samples of Westerly granite, Bedford limestone, and Weber, Navajo, ...
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(Massachusetts Institute of Technology. Earth Resources Laboratory, 2000)We show both theoretically and experimentally how stress concentrations affect the velocity field around a borehole surrounded by a formation with intrinsic ortohombic anisotropy. When F[subscript x] = F[subscript y], ...
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(Massachusetts Institute of Technology. Earth Resources Laboratory, 1997)Aligned vertical fractures introduce velocity anisotropy which is directly related to parameters, such as fracture density, fracture shape and fracture contents. Effective medium models allow us to study qP- and qS-wave ...
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(Massachusetts Institute of Technology. Earth Resources Laboratory, 1983)A series of laboratory experiments was conducted with four ocean sediments, two biogenic oozes and two clays. Permeability and thermal conductivity were directly measured as a function of porosity and the testing program ...
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(Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)Data recorded by the full waveform acoustic logging tool EVA shows events generated at acoustic layer boundaries. These can be interpreted as reflections on and transmissions through interfaces. Ray modelling shows that ...
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(Massachusetts Institute of Technology. Earth Resources Laboratory, 2003)When a seismic wave propagates in a fluid-saturated porous medium, a seismoelectric field can be induced in the medium due to an electric double layer at the interface between solid and fluid. The strength of the seismoelectric ...
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(Massachusetts Institute of Technology. Earth Resources Laboratory, 2004)The effects of mismatched multipole sources were investigated. Multipole sources considered here are those that they are constructed of monopoles with appropriate sign combination. To simulate mismatched dipole and ...
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(Massachusetts Institute of Technology. Earth Resources Laboratory, 2009-12-17)In full-waveform inversion of seismic body waves, often the free surface is ignored on grounds of computational efficiency. Asynthetic study was performed to investigate the effects of this simplification. In terms of ...
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(Massachusetts Institute of Technology. Earth Resources Laboratory, 2008)In full waveform inversion of seismic body waves, the free surface is often ignored on grounds of computational efficiency. We investigate the effect of this simplification for highly irregular topography by means of a ...
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(Massachusetts Institute of Technology. Earth Resources Laboratory, 2004)In this paper, a finite element approach is applied to study the dispersion properties of non-leaky acoustic waves inside boreholes with off-centered LWD (logging while drilling) tools. Both soft and hard formation cases ...
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(Massachusetts Institute of Technology. Earth Resources Laboratory, 2003)This dissertation made three contributions to numerical simulation and borehole acoustic logging. The first one is a novel finite difference time domain algorithm that features non- uniform grid, wavelet-based difference ...
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Efficient characterization of uncertain model parameters with a reduced-order ensemble Kalman filter (Massachusetts Institute of Technology. Earth Resources Laboratory, 2013)Spatially variable model parameters are often highly uncertain and di fficult to observe. This has prompted the widespread use of Bayesian characterization methods that can infer parameter values from measurements of related ...
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(Massachusetts Institute of Technology. Earth Resources Laboratory, 2012-06)We proposed an efficient target-oriented method to characterize seismic properties of fractured reservoirs: the spacing between fractures and the fracture orientation. Based on the diffraction theory, the scattered wave ...
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(Massachusetts Institute of Technology. Earth Resources Laboratory, 2013)In this abstract we present a method that allows arbitrary elements of the approximate Hessian to be estimated simultaneously. Preliminary theoretical and numerical investigations suggest that the number of forward models ...
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(Massachusetts Institute of Technology. Earth Resources Laboratory, 1988)The radiation of an elastic wave field from a plane piston source is formulated using the representation theorem, in which the Green's function for an elastic half space is employed. On the basis of this formulation, we ...
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