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Browsing Earth Resources Laboratory by Title

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  • Kostek, Sergio (Massachusetts Institute of Technology. Earth Resources Laboratory, 1991)
    Acoustic logging is an important geophysical method for obtaining relevant information concerning rock properties in formations traversed by boreholes. Typically, the formation parameters that are measured are the ...
  • Nolte, Bertram (Massachusetts Institute of Technology. Earth Resources Laboratory, 1996)
    We present a finite-volume method for the modeling of wave propagation on irregular triangular grids. This method is based on an integral formulation of the wave equation via Gauss's theorem and on spatial discretization ...
  • Haartsen, Matthijs W.; Toksoz, M. N. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1995)
    We present a method to simulate the propagation of seismic and converted electromagnetic waves generated by a mechanical borehole source embedded in a layered poroelastic medium. The electroseismic conversions occur at ...
  • Pride, Steve (Massachusetts Institute of Technology. Earth Resources Laboratory, 1992)
    The drag forces controlling the amount of relative flow induced in a fluid-saturated porous material by a mechanical wave are modeled here from first principles. Specifically, analytical expressions are derived for the ...
  • Meredith, J. A.; Cheng, C. H.; Toksoz, M. N. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1990)
    The work of Heelan (1952, 1953a,b) was one of the first studies of wave propagation from a cylindrical boundary. Heelan attempted to model the radiation emanating from a cylindrical shot hole filled with dynamite. To do ...
  • Meredith, J. A.; Cheng, C. H.; Toksoz, M. N. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1990)
    This paper represents the first of a two paper sequence comprising a multi-faceted introduction to the numerical and analytical modelling of seismic sources in a borehole. Part one will present a literature review and a ...
  • Rao, V. N. Rama; Burns, Daniel R.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1999)
    A model for a fluid-filled borehole with an LWD tool is used to identify and analyze the monopole, dipole, and quadrupole modes that are present. The modes can be classified into three groups and have dispersion behavior ...
  • Shabelansky, Andrey Hanan; Malcolm, Alison E.; Fehler, Michael (Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)
    Heating heavy oil reservoirs is a common method for reducing the high viscosity of heavy oil and thus increasing the recovery factor. Monitoring these changes in the reservoir is essential for delineating the heated region ...
  • Herrmann, Felix J. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1999)
    Edges in a medium are the primary source of coherent reflections because they exhibit a large or even diverging amplitude behavior for their derivatives. Generally the medium properties are not only assumed to jump across ...
  • de Hoop, Martijn V.; Herrmann, Felix (Massachusetts Institute of Technology. Earth Resources Laboratory, 2002)
    A matching pursuit technique in conjunction with an imaging method is used to obtain quantitative information on geological records from seismic data. The technique is based on a greedy, non-linear search algorithm ...
  • Richardson, Alan; Malcolm, Alison E. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)
    Conventional one way migration methods exclude turning waves and multiples. We propose an algorithm that uses multiple passes to extend the one way method to efficiently include these wavepaths. A comparison of the images ...
  • Bechor Ben Dov, Noah; Herring, Thomas A. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)
    MAI is a technique to extract along-track (horizontal) phase-based displacements from InSAR data. MAI’s theoretical precision can be at the centimeter level, an order of magnitude improvement over amplitude-based pixel ...
  • Imhof, Matthias G. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1996)
    This paper presents a new approach to solving scattering of elastic waves in two dimensions. Wavefields are often expanded into an orthogonal set of basis functions. Unfortunately, these expansions converge rather slowly ...
  • Zhu, Zhenya; Wang, Jun; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)
    In seismoelectric well logging, an acoustic wave propagates along a borehole and induces electrical signals along the borehole wall. The apparent velocities of these seismoelectric signals are equal to the formation ...
  • Grandi-Karam, Samantha (Massachusetts Institute of Technology. Earth Resources Laboratory, 2008-02)
    In this thesis we address the problem of determining in situ stress and fracture properties in reservoirs using borehole logs and surface seismic reflection data. The dissertation covers four subtopics. The first is the ...
  • Thompson, Delaine; Burns, Dan (Massachusetts Institute of Technology. Earth Resources Laboratory, 1989)
    We perform a technique called multi-shot processing on a section of 12-channel sonic logs in order to better resolve compressional and shear velocities. The data are from the ODP Leg 102 cruise, which occupied drill site ...
  • Mendelson, Jim (Massachusetts Institute of Technology. Earth Resources Laboratory, 1989)
    We develop a linear programming inversion scheme to estimate lithology from well log data. The inversion described severely limits the dependence on core retrieval, and makes accurate mapping of new parameters possible. ...
  • Imhof, Matthias G.; Toksoz, M. Nafi; Burch, Charles I.; Queen, John H. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1998)
    Seismic data acquired directly over near-surface limestone formations are commonly observed to be of inferior quality. A possible cause for this degradation is scattering in the near-subsurface by, e.g., the weathering ...
  • AI-Dajani, AbdulFattah; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1999)
    Reflection moveout in azimuthally anisotropic media is not only azimuthally dependent but it is also nonhyperbolic. As a result, the conventional hyperbolic normal moveout (NMO) equation parameterized by the exact NMO ...
  • Al-Dajani, A.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 2002)
    Reflection moveout in azimuthally anisotropic media is not only azimuthally dependent but it is also nonhyperbolic. As a result, the conventional hyperbolic normal moveout (NMO) equation parameterized by the exact NMO ...
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