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Browsing Earth Resources Laboratory by Title

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  • Willis, Mark E.; Zhang, Yang; Burns, Daniel R. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2004)
    We present results of 3D numerical modeling using a series of simple point scatterers to create synthetic seismic shot records collected over regular, discrete, vertical fracture systems. The background medium is taken to ...
  • Cheng, Ningya; Schultz, Craig A.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1995)
    In this paper we compared scattered waves from 2-D and 3-D interface structures. The modeling technique is the 3-D time domain finite difference method. The scheme is second-order accurate in time and fourth-order accurate ...
  • Nihei, Kurt T.; Ajo-Franklin, Jonathan B.; Campman, Xander; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 2006-05-28)
    Seismic tomography, as typically practiced on both the exploration, crustal, and global scales, considers only the arrival times of selected sets of phases and relies primarily on WKBJ theory during inversion. Since the ...
  • Cheng, C. H. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1992)
    A commonly used model for a transversely anisotropic crack rock is that by Hudson (1980, 1981). This model is based on a simplified analysis of a thin circular crack, with displacement and stress conditions specified on ...
  • Zhu, Zheny; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 2002)
    A seismic wave propagating in a fluid-saturated porous media, moves ions in the double layer between the fluid and solid and induces an electric field. When there is discontinuity (such as a fracture), the seismic wave ...
  • Cheng, Ningya; Cheng, C. H. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1995)
    For linear wave propagation in anisotropic media, the principle of superposition still holds. The decomposition of the acoustic dipole log is based on this principle. In the forward decomposition inline and crossline ...
  • Morgan, Frank Dale; Vichabian, Yervant; Sogade, John (Massachusetts Institute of Technology. Earth Resources Laboratory, 2003)
    The Qualibou Caldera has been studied since the 1970’s for possible development of geothermal power generation. In 1974 dipole-dipole resistivity measurements were performed in the area. The apparent resistivity data was ...
  • Poliannikov, Oleg V.; Malcolm, Alison E. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2010)
    In many applications, sequestering CO[subscript 2] underground for example, determining whether or not the medium has changed is of primary importance, with secondary goals of locating and quantifying that change. We ...
  • Hardin, Ernest; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)
    Field testing has been conducted to evaluate a model which predicts the permeability and orientation of a permeable zone, in a deep water well in crystalline rock. Tube waves are generated by seismic P-waves incident on ...
  • Perez, Maria Auxiliadora; Gibson, Richard L., Jr. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1997)
    Azimuthally-dependent P-wave AVO (amplitude variation with offset) responses can be related to open fracture orientation and have been suggested as a geophysical tool to identify fracture orientation in fractured oil and ...
  • Beydoun, W. B.; Cheng, C. H.; Toksoz, M. N. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1984-01-01)
    In Vertical Seismic Profiling surveys tube waves are generated by compressional waves impinging on subsurface fractures or permeable zones. The problem of generation of these waves by a non-normal incident P wave for an ...
  • Beydoun, W. B.; Cheng, C. H.; Toksoz, M. N. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1983)
    In Vertical Seismic Profiling tube waves are generated by compressional waves impinging on subsurface fractures or permeable zones. The amplitude of tube waves is dependent upon the formation permeability, the length of ...
  • Tubman, Kenneth M.; Cheng, C. H.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1984)
    Wave propagation in bonded and unbonded cased boreholes is examined through the calculation cif synthetic full waveform acoustic logs. The models consist of a central fluid borehole surrounded by a number of fluid and solid ...
  • Al-Dajani, AbdulFattah; Morgan, Frank Dale; Toksoz, M. Nafi; Repperty, Philip (Massachusetts Institute of Technology. Earth Resources Laboratory, 2001)
    Ground penetrating radar (GPR) signatures, such as reflection moveout, are sensitive to the presence of azimuthal anisotropy. Azimuthal anisotropy can occur as an intrinsic property of the medium and/or due to the presence ...
  • Cheng, C. H.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1983)
    Direct determination of formation shear wave travel time is impossible in "slow" formations where the shear wave velocity is lower than the borehole fluid (mud) velocity. However, the Stoneley waves in these formations are ...
  • Toksoz, M. Nafi; Wilkens, R. H.; Cheng, C. H. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1984)
    In boreholes where formation shear velocity is lower than borehole fluid velocity neither refracted shear waves nor pseudo-Rayleigh waves can propagate. When frequency response of the sonde does not extend to low frequencies ...
  • Lee, Jung Mo; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1995)
    Open fractures are of interest in many areas such as ground water contamination, hazardous waste disposal, oil and gas recovery, and geothermal energy extraction. In borehole geophysics and engineering, fractures are ...
  • Meredith, J . A.; Cheng, C. H.; Wilkens, R. H. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1987)
    The inversion technique presented in this volume (Cheng, 1987) that simultaneously inverts full waveform acoustic logs for shear wave velocity (V[subscript 3]) and compressional wave attenuation (Q[subscript p]) was applied ...
  • Sen, Pabitra; Liu, Yun; Leu, Gabriela; Cory, David G. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2001)
    NMR methods are widely used to probe the structure and fluid dynamics of porous materials including such diverse materials as cheese and chocolate, cosmetics and pharmaceuticals, solvents in resins and soft matter, biological ...
  • Huang, Xiaojun; Burns, Daniel R.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1998)
    In this paper, we demonstrate that dispersion analysis of cross-dipole data has promising potential not only for differentiating stress-induced anisotropy from intrinsic anisotropy, but also for providing information on ...
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