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Browsing Earth Resources Laboratory by Title

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  • Nolte, Bertram; Cheng, Arthur C. H. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1996)
    Polarizations of split shear waves and flexural borehole waves are most commonly estimated from four-component data using the rotation technique of Alford (1986). This method is limited to the case of the two polarizations ...
  • Saggaf, Muhammad M.; Toksoz, M. Nafi; Mustafa, Husam M. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2000)
    Traditional joint inversion methods reqnire an a priori prescribed operator that links the reservoir properties to the observed seismic response. The methods also rely on a linearized approach to the solution that makes ...
  • Meredith, J . A.; Wilkens, R. H.; Cheng, C. H. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1989)
    Shear wave velocities from full waveform acoustic logs were determined at DSDP Site 613 using the spectral ratio inversion method. Discrete shear wave velocities for a 350 meter interval at 0.5-2 meter depth increments ...
  • Burns, Daniel R. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2002)
    During the past year, our research effort has continued to focus on borehole acoustics and reservoir characterization. The papers presented at the annual meeting, and those included in this volume, include theoretical ...
  • Burns, Daniel R. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2007)
    ERL's research activities are focused on integrated reservoir characterization and monitoring. In order to maximize the information we can obtain from geophysical measurements, there are two overarching themes: 1. Utilize ...
  • Burns, Daniel R. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2001)
    Our research results for the past year are divided into two major areas: 1) the quantification and prediction of reservoir heterogeneity and 2) the use of borehole measurements to quantify fluid flow related properties. ...
  • Burns, Daniel R. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2000)
    During the past year we have continued to make progress on the difficult problems associated with extracting geological information from geophysical data sets. Our research results focus on three major areas of ...
  • Burns, Daniel R.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1998)
    The characterization of subsurface fluid flow is the key to exploration, production, and management of oil, gas, geothermal, and groundwater reservoirs. From a research perspective the question then becomes how can we ...
  • Cheng, N. Y.; Zhu, Zhenya; Cheng, C. H.; Toksoz, M. N. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1992)
    A series of model experiments are done in the ultrasonic laboratory to study the radiation of downhole sources in a variety of formations. Three models are used in the experiments. They are a lucite model, a lucite model ...
  • Zhu, Zhenya; Chi, Shihong; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 2005)
    In a fluid-saturated porous formation, an impinging seismic wave induces fluid motion. The motion of fluid relative to the rock frame generates an electric streaming current. This current produces electric and magnetic ...
  • Coles, Darrell A.; Morgan, Frank Dale (Massachusetts Institute of Technology. Earth Resources Laboratory, 2007)
    This article explores various aspects of geophysical experimental design (ED) applied to single-borehole DC resistivity. For resistivity problems, an experiment or survey is defined as the set of electrode configurations ...
  • La, Tien-when; Coyner, Karl B.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)
    We use the ultrasonic transmission method to measure P-, SH-, and SV-wave velocities for Chelmsford Granite, Chicopee Shale, and Berea Sandstone in different directions up to 1000 bars confining pressure. The velocity ...
  • Zhu, Zhenya; Morgan, Frank Dale; Marone, Chris J.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 2001)
    When a rock sample is pressed by a force, the pressure on the crystal lattice generates an electrical field around the quart grains due to the piezoelectric effect. If a rock is saturated by conductive fluid, the relative ...
  • Zhu, Zhenya; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1996)
    The electrokinetic effect in a fluid-saturated porous rock is defined as the coupling and conversion between seismic and electric energies. When seismic waves propagate through a fluid-saturated formation and cause a ...
  • Zhu, Zhenya; Haartsen, Matthijs W.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1997)
    The coupling between seismic and electromagnetic waves in a fluid-saturated porous medium is essentially controlled by the electrokinetic effect. The inverse effect of the seismoelectric conversion, the electroseismic ...
  • Zhu, Zhenya; Rao, Rama V. N.; Burns, Daniel R.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 2004)
    A scaled multipole acoustic tool is built for laboratory measurements at ultrasonic frequencies in borehole models. The source with four separate transducers generate monopole, dipole, and quadrupole waves by different ...
  • Zhu, Zhenya; Toksoz, M. Nafi; Burns, Daniel R. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2008)
    Laboratory experiments are performed with an isotropic Lucite borehole model to measure the acoustic wave fields generated by a monopole source in the borehole. The source not only generates acoustic waves propagating ...
  • Zhu, Zhenya; Haartsen, Matthijs W.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1997)
    Experimental and theoretical studies show that there are two kinds of electromagnetic (EM) fields generated by seismic waves in a fluid-saturated porous medium. First, at an interface where the formation properties are ...
  • Zhu, Zhenya; Toksoz, M. Nafi; Zhan, Xin (Massachusetts Institute of Technology. Earth Resources Laboratory, 2009)
    Streaming potential across a porous medium is induced by a fluid flow due to an electric double layer between a solid and a fluid. When an acoustic wave propagates through a porous medium, the wave pressure generates a ...
  • Zhan, Xin; Zhu, Zhenya; Chi, Shihong; Rao, Rama V. N.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 2005)
    Acoustic logging while drilling (LWD) may be complicated because of contamination by waves propagating along the drill collar (the tool waves). In this paper we propose a new method for separating tool waves from the true ...
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