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Browsing Earth Resources Laboratory by Title

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  • Rao, Rama V. N.; Zhu, Zheny; Burns, Daniel R.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 2002)
    A model LWD tool (0.16" ID, 0.4" OD) was built to investigate its operation in an anisotropic formation. The tool consists of a dipole source and six dipole receivers capable of operating at several hundred kHz. The ...
  • Shi, Weiqun (Massachusetts Institute of Technology. Earth Resources Laboratory, 1995)
    The backscattering of sound by inhomogeneities of the ocean sediment may provide a remarkable effect on underwater acoustic wave propagation. It may also be used as a means of remotely estimating complicated sediment ...
  • Cheng, C. H.; Pennington, W. D.; Paillet, F.L. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1992-02)
    Full-waveform acoustic logging has made significant advances in both theory and application in recent years, and these advances have greatly increased the capability of log analysts to measure the physical properties of ...
  • Tang, X. M.; Cheng, C. H.; Toksaz, M. N. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1990)
    The propagation of guided waves in a fluid-filled borehole with an open horizontal fracture is investigated both theoretically and experimentally. The fracture is modeled as a fluid layer that separates the domain of ...
  • Peng, Chengbin; Cheng, C. H. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1994)
    Boreholes with 10% or more ellipticity are not uncommon. In this paper, we consider the coupling of an incident elastic wave into a borehole of irregular cross-section and investigate the cross-mode coupling phenomenon ...
  • Zhang, Haijiang; Gasperikova, Erika; Parker, Beatrice; Tryggvason, Ari; Gudmundsson, Olafur; Seher, Tim; Newman, Gregory; Fehler, Michael; Arnason, Knutur (Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)
    We describe the ongoing development of joint geophysical imaging methodologies for geothermal site characterization and demonstrate their potential in two regions: Krafla volcano and associated geothermal fields in ...
  • Al-Dajani, AbdulFattah; Burns, Daniel; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 2000)
    The objective of tills study is to discriminate between aeolian and fluvial deposits of the Permian Unayzah formation in Central Saudi Arabia by using wireline logs. The analysis is conducted on wire-line logs (field ...
  • Cheng, Ningya; House, Leigh; Fehler, Michael C. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1996)
    A higher-order parabolic equation is used to compute the traveltime (phase) and the amplitude in constant density acoustic media. This approach is in the frequency domain, thereby avoiding the high frequency approximation ...
  • Saggaf, Muhammed M.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1999)
    Reflection coefficients are observed in nature to have stochastic behavior that departs significantly from the white noise model. Conventional deconvolution methods, however, assume reflectivity to be a white noise ...
  • Barton, C.; Cheng, C. R.; Toksoz, M. N. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1984)
    Direct recording of formation shear wave travel time is not possible in "soft" formations where the shear velocity is lower than the borehole fluid velocity. The borehole Stoneley wave is quite sensitive to changes in ...
  • Melo, Gabriela; Malcolm, Alison E.; Poliannikov, Oleg V.; Fehler, Michael (Massachusetts Institute of Technology. Earth Resources Laboratory, 2013)
    In many reservoirs, an increase in permeability and conductivity is achieved by hydraulic fracturing/stimulations which open cracks and fractures that then act as pathways for fluids to navigate in the subsurface. Mapping, ...
  • Rieven, Shirley; Rodi, William (Massachusetts Institute of Technology. Earth Resources Laboratory, 1995)
    This report presents the results of a feasibility study designed to assess whether microseismic location techniques can provide enough accuracy and precision to enable a high resolution study of the spatial distribution ...
  • Grandi, Samantha K.; Willis, Mark E.; Burns, Daniel R.; oksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 2007-05)
    We detect fracture corridors and determine their orientation and average spacing based on an analysis of seismic coda in the frequency-wave number (f-k ) domain. Fracture corridors have dimensions similar to seismic ...
  • Zheng, Yibing; Huang, Xiaojun (Massachusetts Institute of Technology. Earth Resources Laboratory, 2002)
    We develop new numerical anisotropic perfectly matched layer (PML) boundaries for elastic waves in Cartesian, cylindrical and spherical coordinate systems. The elasticity tensor of this absorbing boundary is chosen to be ...
  • Massachusetts Institute of Technology. Earth Resources Laboratory (Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)
  • Mathieu, F.; Toksoz, M. N. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1984)
    Development of borehole geophysics has recently focused on reservoir characterization. Within this effort, extensive full waveform acoustic surveys have demonstrated a correlation between the occurance of open fractures ...
  • Ellefsen, K. J.; Cheng, C. H. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1988)
    The Lagrangian for guided waves in a completely general borehole model is presented. Rayleigh's principle is used to derive the first order perturbations in wavenumber and frequency due to slight perturbations in the ...
  • Saggaf, Muhammad M.; Toksoz, M. Nafi; Mustafa, Husam M. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2000)
    We apply an approach based on smooth neural networks to a 3D seismic survey in the Shedgum area of the Ghawar Field to estimate the reservoir porosity distribution of the Arab-D Member. We conducted numerous systematic ...
  • Stephen, R. A.; Pardo-Casas, F. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1984)
    Finite difference synthetic acoustic logs are suitable for studying wave propagation in vertically varying boreholes and in boreholes with continuously varying properties. Snapshots for the traditional smooth bore in a ...
  • Ellefsen, K. J.; Cheng, C. H. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1989)
    For guided wave propagation in boreholes, perturbation theory is used to calculate (1) the partial derivative of the wavenumber or frequency with respect to an elastic modulus or density, (2) group velocity, and (3) the ...
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