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Browsing Earth Resources Laboratory Industry Consortia Technical Reports by Title

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Browsing Earth Resources Laboratory Industry Consortia Technical Reports by Title

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  • Zhan, Xin; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 2007-05-27)
    The microstructure of a porous medium and physical characteristics of the solid and the fluids that occupy the pore space determine the macroscopic transport properties of the medium. The computation of macroscopic ...
  • Edie, Margaret S.; Olson, John F.; Burns, Daniel R.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 2000)
    Realistic simulations of flow in porous media are dependent upon having a three-dimensional, high resolution image of pore structure which is difficult to obtain. So, we ask the question, "How fine a resolution is necessary ...
  • Huang, Xiaojun; Burns, Daniel R.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 2001)
    The theory of acoustoelasticity provides direct link between the change of elastic wave velocities and residual stresses in solids. The general theory of acoustoelasticity is reviewed. A number of experimental measurements ...
  • Tao, Guo; Cheng, C. H. (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 ...
  • Tang, X. M.; Cheng, C. H. (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 ...
  • Ellefsen, K. J.; Cheng, C. H.; Toksoz, M. N. (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 ...
  • Byun, Joongmoo; Toksoz, M. Nafi (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 ...
  • Tubman, Kenneth M.; Cheng, C. H.; Toksoz, M. Nafi (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 ...
  • Coyner, Karl B.; Cheng, C. H. (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, ...
  • Huang, Xiaojun; Zhu, Zhenya; Toksoz, M. Nafi; Burns, Daniel R. (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], ...
  • Shen, Feng; Zhu, Xiang; Toksoz, M. Nafi (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 ...
  • Morin, Roger; Silva, Armand J. (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 ...
  • Paternoster, Benoit; Larrere, Marc (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 ...
  • Zhu, Zhenya; Toksoz, M. Nafi (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 ...
  • Byun, Joongmoo; Toksoz, M. Nafi; Rao, Rama V. N. (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 ...
  • Bleibinhaus, Florian; Rondenay, Stephane (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 ...
  • Bleibinhaus, Florian; Rondenay, Stephane (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 ...
  • Zheng, Yibing; Toksoz, M. Nafi (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 ...
  • Huang, Xiaojun (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 ...
  • Tang, X. M.; Toksoz, M. N.; Cheng, C. H. (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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