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Browsing Earth Resources Laboratory by Title

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  • Fang, Xinding; Fehler, Michael; Zhu, Zhenya; Chen, Tianrun; Brown, Stephen; Cheng, Arthur; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)
    Formation elastic properties near a borehole may be altered from their original state due to the stress concentration around the borehole. This could result in a biased estimation of formation properties but could provide ...
  • Willis, M. E.; Toksoz, M. N.; Cheng, C. H. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1983)
    Full waveform acoustic well logging has become instrumental to hydrocarbon exploration because of its ability to determine in situ velocity information for P and S waves as well as the attenuation (or absorption) of seismic ...
  • Letourneau, Pierre-David; Demanet, Laurent; Calandra, Henri (Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)
    We present a method for approximately inverting the Hessian of full waveform inversion as a dip-dependent and scale-dependent amplitude correction. The terms in the expansion of this correction are determined by least-squares ...
  • Chen, C. -W.; Rondenay, Stephane; Miller, D. E.; Djikpesse, H. A. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2010-01-01)
    We investigate the applicability of an array-conditioned deconvolution technique, developed for analyzing borehole seismic exploration data, to teleseismic receiver functions and data preprocessing steps for scattered ...
  • Jinzhong, Zhang; Cheng, C. H. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)
    A numerical investigation of asymmetric modes of elastic wave propagation in a fluid-filled borehole is treated in this paper. The dispersion curves of guided waves (called flexural waves) and synthetic microseismograms ...
  • Chen, Tianrun; Wang, Bing; Zhu, Zhenya; Burns, Daniel R. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2009)
    Most acoustic LWD tools generate a single pure borehole mode (e.g., dipole or quadrupole) to estimate the formation shear velocity. We propose an approach where many borehole modes are generated and all the modes are ...
  • Chen, Tianrun; Wang, Bing; Zhu, Zhenya; Toksoz, Daniel R. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2010)
    Most acoustic logging while drilling (LWD) tools generate a single pure borehole mode (e.g., dipole or quadrupole) to estimate the formation shear velocity. We propose an approach where multipole modes are generated ...
  • Brown, Stephen; Hagin, Paul; Bussod, Gilles (Massachusetts Institute of Technology. Earth Resources Laboratory, 2011)
    Standard geophysical methods for monitoring CO[subscript 2] injection have been proposed but many have severe limitations. In particular, while they can be used to monitor the presence or absence of CO[subscript 2] during ...
  • Shen, Feng; Sierra, Jesus; Burns, Daniel R.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1999)
    Using the amplitude versus offset (AVO) and the frequency versus offset (FVO) information, the diagnostic ability of P-wave seismic data in fracture detection is investigated. The offset-dependent attributes (AVO and FVO) ...
  • Zamanian, S. Ahmad; Fehler, Michael; Burns, Daniel R. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2012)
    We describe a methodology for quantitatively characterizing the fractured nature of a hydrocarbon or geothermal reservoir from surface seismic data under a Bayesian inference framework. Fractures provide pathways for fluid ...
  • Burns, Daniel R. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1997)
    Research activity in the Borehole Acoustics and Logging/Reservoir Delineation Consortia continue to focus on the development of geophysical methods to detect and characterize geological conditions which control fluid ...
  • Peng, Chengbin; Cheng, C. H.; Toksoz, M. N. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1992)
    An exact formulation for borehole coupling, which is valid for all frequencies and all azimuthally symmetric and nonsymrnetric components, is given in this paper. The borehole effects on downhole measurements are studied ...
  • Mikhailov, Oleg V.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1998)
    Measuring the electrical field induced by a borehole Stoneley wave is a new method for characterizing a rock formation around a borehole. Our field measurements demonstrate that the Stoneley-wave-induced electrical field ...
  • Garipova, Yulia V. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1997)
    In this paper we perform the inversion of borehole resistivity data using the software package developed by Western Atlas Logging Services, Houston, TX. Direct current resistivity methods, namely lateral sounding and ...
  • Dong, Wenjie; Bouchon, Michel; Toksoz, M. N. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1994)
    An algorithm based on the boundary element method is established for modeling seismic source radiation from open or cased boreholes in layered transversely isotropic (TI) media. The axis of symmetry of TI layers is assumed ...
  • Tang, X. M.; Cheng, C. H. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1991)
    This study investigates the propagation of borehole Stoneley waves across heterogeneous and permeable structures. By modeling the structure as a zone intersecting the borehole, a simple one-dimensional theory is formulated ...
  • Zhu, Zhenya; Tang, Xiaoming; Cheng, C. H.; Toksoz, M. N. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1992)
    The attenuation of borehole Stoneley waves across a permeable structure (e.g., fractures or fracture zone) is correlated with the permeability of the structure. Using a simplified Biot theory, the structure can be modelled ...
  • Cheng, Ningya; Cheng, C. H.; Toksoz, M. N. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1994)
    In this paper we developed a 3-D finite difference method to simulate wave propagations in an isotropic medium. The wave equation is formulated into the first-order hyperbolic equations by using velocity and stress and ...
  • Cheng, Ningya; Cheng, C. H.; Toksoz, M. N. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1994)
    In this paper we extend the 3-D finite difference method to simulate wave propagations in an anisotropic medium. The scheme is tested in the homogeneous medium. The finite difference results agree excellently with the ...
  • Cheng, Ningya; Cheng, C. H.; Toksoz, M. N. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1994)
    In this paper we apply the 3-D finite difference method to simulate borehole wave propagations in an isotropic formation. The scheme is tested in a fluid-filled borehole surrounded by the homogeneous elastic formation. ...
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