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Browsing Earth Resources Laboratory by Title

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  • Ajo-Franklin, Jonathan B.; Urban, Jaime; Harris, Jerry M. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2005-06-01)
    Time-lapse geophysical measurements and seismic imaging methods in particular are powerful techniques for monitoring changes in reservoir properties. Traditional time-lapse processing methods treat each dataset as an ...
  • Cheng, C. H.; Tang, X. M.; Paillet, F . L. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1989)
    Several recent investigations indicate that tube-wave amplitude attenuation in acoustic full-waveform logs is correlated with permeability in fractured rocks. However, there are significant differences between predictions ...
  • Cheng, Ningya; Cheng, Arthur C. H.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1996)
    A recursive algorithm to incorporate attenuation into a time-domain finite-difference calculation is developed. First, a rheological model of the generalized Maxwell body is chosen. The discrete relaxation frequency and ...
  • Lu, Rongrong (Massachusetts Institute of Technology. Earth Resources Laboratory, 2008-02)
    The objective of this thesis is to investigate the applications of Time Reversed Acoustics (TRA) to locate seismic sources and image subsurface structures. The back-propagation process of the TRA experiment can be divided ...
  • Kudrolli, Arshad; Blanchette, Francois; Brenner, Michael P.; Bush, John W. M. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2001)
    We are currently carrying out a series of experiments and theoretical calculations with the goal of creating a quantitative model for the structure of beds created by turbidity currents. Our research project operates on ...
  • Olson, John F. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1998)
    Fluid flow in porous rock due to an oscillatory pressure gradient is simulated. We observe distributions of density and velocity in the rock which point to viscous dissipation. We will use this method to seek a deeper ...
  • Zhao, Xiaomin; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1992)
    A stable Alternating Direction Implicit finite-difference algorithm is used to model transient fluid flow in heterogeneous porous media. In connection with the laboratory system for pressure transient testing of core ...
  • Schmitt, D. P. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1988)
    Using the results of homogenization theory, the constitutive equations for an anisotropic porous formation saturated by a Newtonian viscous fluid are derived. The transverse isotropy situation is investigated in terms ...
  • Schmitt, D. P. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1988)
    The wavefields generated by monopole and dipole sources in a fluid filled borehole embedded in multilayered transversely isotropic saturated porous formations are studied. The layers are modeled following Biot theory ...
  • Hsui, Albert T.; Jinzhong, Zhang; Cheng, C. H.; Toksoz, M. N. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)
    The measurement of in-situ permeability is very important in exploration and production logging. Observed data show that tube wave attenuation in full waveform acoustic logs is correlated with formation permeability. It ...
  • Peng, Chengbin; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1992)
    An approximate theory for the scattering of an incident plane P wave into tube waves in a fluid-filled borehole drilled through two homogeneous half-spaces is proposed in this paper. This theory is in excellent agreement ...
  • Burridge, Robert; Kostek, Sergio; Kurkjian, Andrew L. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1993)
    A simple asymptotic analysis, based on the smallness of the ratio of the borehole radius to the wavelength, reveals the interaction between tube waves and seismic waves. The pressure field in a tube wave acts as a secondary ...
  • 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 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 ...
  • Block, Lisa V.; Cheng, C. H.; Duckworth, Gregory L. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1987)
    Average semblance and maximum-likelihood 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 ...
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