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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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  • Efficient Double-Beam Characterization for Fractured Reservoir 
    Zheng, Yingcai; Fang, Xinding; Fehler, Michael; Burns, Daniel R. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2012-06)
    We proposed an efficient target-oriented method to characterize seismic properties of fractured reservoirs: the spacing between fractures and the fracture orientation. Based on the diffraction theory, the scattered wave ...
  • Efficient stochastic Hessian estimation for full waveform inversion 
    Willemsen, Lucas Abraham; Malcolm, Alison E.; Hewett, Russell J. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2013)
    In this abstract we present a method that allows arbitrary elements of the approximate Hessian to be estimated simultaneously. Preliminary theoretical and numerical investigations suggest that the number of forward models ...
  • Elastic Wave Diffraction Of A Piston Source And Its Effect On Attenuation Measurement 
    Tang, X. M.; Toksoz, M. N.; Cheng, C. H. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1988)
    The radiation of an elastic wave field from a plane piston source is formulated using the representation theorem, in which the Green's function for an elastic half space is employed. On the basis of this formulation, we ...
  • Elastodynamic Redatumming for VSP Salt Dome Flank Imaging 
    Lu, Rongrong; Willis, Mark E.; Campman, Xander; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 2007)
    In this paper we construct an application methodology for the theoretical elastodynamic redatumming work by Wapenaar (2006) to be able to approximate its use in the problem of imaging a salt dome flank using a walk away ...
  • Electrokinetics Of A Fluid-Saturated Rock Sample: Laboratory Experiments 
    Zhu, Zhenya; Toksoz, M. N. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1994)
    The conversion between seismic and electromagnetic energies was discovered in a fluidfilled porous formation. When seismic waves propagate through a fluid-saturated porous formation, relative motion between the pore fluid ...
  • Electroseismic and Seismoelectric Measurements of Rock Samples in a Water Tank 
    Zhu, Zhenya; Burns, Daniel R.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 2007)
    An electromagnetic wave or a seismic wave can induce seismic or electric waves due to the electrokinetic conversion based on the electric double layer in a fluid-saturated porous medium. In this paper, we observe the ...
  • Electroseismic Investigation Of The Shallow Subsurface: Field Measurements And Numerical Modeling 
    Mikhailov, Oleg V.; Haartsen, Matthijs W.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1996)
    Electroseismic phenomena in porous media, first observed almost 60 years ago (Ivanov, 1939), were recently "rediscovered" due to their potential to detect zones of high fluid mobility and fluid chemistry contrasts in the ...
  • Electroseismic Logging For The Detection And Characterization Of Permeable Zones: Field Measurements And Theory 
    Mikhailov, Oleg V.; Burns, Daniel R.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1998)
    A Stoneley wave propagating in a borehole generates pore fluid flow within the permeable zones intersected by the borehole. In turn, the fluid flow induces a streaming electrical potential. This electrical potential ...
  • Electroseismic Waves From Point Sources In Layered Media 
    Haartsen, Matthijs W.; Toksoz, M. N. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1995)
    The macroscopic governing equations controlling the coupled electromagnetics and acoustics of porous media are numerically solved for the case of a layered poro-elastic medium.It is shown that these coupled equations ...
  • Elimination of LWD (Logging-While-Drilling) Tool Modes Using Seismoelectric Data 
    Zhan, Xin; Zhu, Zhenya; Chi, Shihong; Rao, Rama V. N.; Burns, Daniel R.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 2006)
    Borehole acoustic logging-while-drilling (LWD) for formation evaluation has become an indispensable part of hydrocarbon reservoir assessment (Tang et al., 2002; Cittá et al., 2004; Esmersoy et al., 2005). However, the ...
  • Energy Partitioning and Attenuation of Guided Waves in a Radially Layered Borehole 
    Burns, D. R.; Cheng, C. H.; Toksoz, M. N. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)
    Recently published results (Tubman et al., 1984; Baker,. 1984) indicate that synthetic full waveform acoustic logs generated in cased or damaged boreholes differ significantly from those generated in an open hole with ...
  • The Equivalent Force System Of A Monopole Source In A Fluid-Filled Open Borehole 
    Ben-Menahem, Ari; Kostek, Sergio (Massachusetts Institute of Technology. Earth Resources Laboratory, 1991)
    The elastodynamic body-wave field outside a fluid-filled open borehole due to a monopole source in the fluid, is reduced to the radiation-field due to a suitable equivalent force system (EFS) in the absence of the borehole, ...
  • Estimate the Effective Elastic Properties of Digitized Porous Rocks by Inverting the Cracks Unresolved 
    Zhang, Yang; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 2010)
    Current imaging technique such as micro X-ray CT can provide us detailed 3D micro-structures of porous rocks that can be used in numerical simulation so as to predict elastic properties of rocks saturated with different ...
  • Estimating A Shear Modulus Of A Transversely Isotropic Formation 
    Ellefsen, K. J.; Cheng, C. H.; Toksoz, M. N. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1990)
    A method to estimate c[subscript 66], which is a shear modulus of a transversely isotropic formation (with its symmetry axis parallel to the borehole), is developed and tested. The inversion for c[subscript 66] is based ...
  • Estimating Phase Velocity And Attenuation Of Guided Waves In Acoustic Logging Data 
    Ellefsen, K. J.; Cheng, C. H. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1988)
    Phase velocity and attenuation of guided waves have been estimated from acoustic logging data recorded by a receiving array. The method uses data from multiple sources and successive depths yielding more accurate estimates ...
  • Estimating Phase Velocity and Attenuation of Guided Waves in Acoustic Logging Data 
    Ellefsen, K. J.; Cheng, C. H.; Duckworth, G. L. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1987)
    Phase velocity and attenuation of guided waves have been estimated from multireceiver, full waveform, acoustic logging data using the extended Prony's method. Since a formation affects velocity and attenuation, estimating ...
  • Estimating The Elastic Moduli Of Transversely Isotropic Formations 
    Ellefsen, K. J.; Cheng, C. H. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1989)
    Using acoustic logging data, we develop a method of estimating the horizontal shear modulus C[subscript 66]) of a transversely isotropic formation with its axis of symmetry parallel to that of the borehole. The data for ...
  • Estimating the fracture density of small-scale vertical fractures when large-scale vertical fractures are present 
    Liu, Yuwei; Fehler, Michael; Fang, Xinding; Liu, Cai (Massachusetts Institute of Technology. Earth Resources Laboratory, 2013)
    When fractures are vertical, aligned and their dimensions are small relative to the seismic wavelength, the medium can be considered to be an equivalent Horizontal Transverse Isotropic (HTI) medium. However, geophysical ...
  • Estimation Of Formation Parameters Using Full Waveform Acoustic and Shear Wave Logs 
    Cheng, N. Y.; Cheng, C. H. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1992)
    A combination of borehole Stoneley waves from full waveform acoustic logs and direct shear wave logs was used to estimate formation permeability and shear wave velocity. Data sets used here were collected by Area's array ...
  • Estimation of fracture compliance from tubewaves generated at a fracture intersecting a borehole 
    Bakku, Sudhish Kumar; Fehler, Michael; Burns, Daniel R. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2011)
    Understanding fracture compliance is important for characterizing fracture networks and for inferring fluid flow in the subsurface. In an attempt to estimate fracture compliance in the field, we developed a new model to ...
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