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Browsing ERL Industry Consortia Technical Reports by Title

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Browsing ERL Industry Consortia Technical Reports by Title

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  • Turpening, Roger; Chauvelier, Chantal; Queen, John; Cox, V. Dale (Massachusetts Institute of Technology. Earth Resources Laboratory, 1996)
    1995 was the most active year in recent history at the test site. Although the initial year of 1983 saw more work, we were still basking in the glow of the modern "oil boom"; the downsizing crash was ahead of us. In 1983, ...
  • Massachusetts Institute of Technology. Earth Resources Laboratory (Massachusetts Institute of Technology. Earth Resources Laboratory, 2011)
  • Krasovec, Mary L.; Burns, Daniel R.; Willis, Mark E.; Malcolm, Shihong; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 2004)
    ERL's in-house nite difference code (Krasovec et al., 2003) has undergone several upgrades in the past year. Most notably, a stretched grid can now be used to greatly reduce the amount of RAM memory needed by certain types ...
  • Kane, Jonathan; Rodi, William; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 2000)
    Information about reservoir properties usually comes from two sources: seismic data and well logs. The former provide an indirect, low resolution image of rock velocity and density. The latter provide direct, high ...
  • Hestholm, Stig; Ruud, Bent (Massachusetts Institute of Technology. Earth Resources Laboratory, 2001)
    New alternative formulations of exact boundary conditions for arbitrary three{dimensional (3−D) free surface topographies on seismic media have been derived. They are shown to be equivalent with previously published ...
  • Matarese, Joseph R. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1995)
    Fast algorithms exist for performing traveltime modeling, even in three dimensions. These algorithms have the nice property that the computational time and memory requirements scale linearly with the number of grid points ...
  • Paillet, Frederick I. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1983)
    Hydraulic fractures in homogeneous granitic rocks were logged with conventional acoustic-transit-time, acoustic-waveform, and acoustic-televiewer logging systems. Fractured intervals ranged in depth from 45 to 570m. and ...
  • Ellefsen, K. J.; Cheng, C. H.; Schmitt, D. P. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1988)
    We have studied the velocity dispersion of guided waves in transversely isotropic formations. Theoretical velocity dispersion curves were calculated with elastic constants based on laboratory and field measurements and ...
  • Tang, X. M.; Cheng, N. Y.; Cheng, C. H.; Toksoz, M. N. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1993)
    The propagation of borehole acoustic waves in the presence of various types of heterogeneous formations is investigated by modeling them as stratified media with varying velocity-depth distributions. Two types of formations ...
  • 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 ...
  • 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 ...
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