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Browsing Earth Resources Laboratory by Title

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  • Poliannikov, Oleg V.; Willis, Mark E.; Mashele, Bongani Jabulani (Massachusetts Institute of Technology. Earth Resources Laboratory, 2009-05-31)
    Seismic interferometry is a method of obtaining a virtual shot gather from a collection of actual shot gathers. The set of traces corresponding to multiple actual shots recorded at two receivers is used to synthesize a ...
  • Willis, Mark E.; Poliannikov, Oleg V. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2010-04-26)
    Seismic interferometry is a method of obtaining a virtual shot gather from a collection of physical shot gathers. The set of traces corresponding to two common receiver gathers from many physical shots is used to synthesize ...
  • Poliannikov, Oleg V.; Malcolm, Alison E.; Djikpesse, Hugues; Prange, Michael (Massachusetts Institute of Technology. Earth Resources Laboratory, 2011-05-19)
    Hydraulic fracturing is the process of injecting high-pressure fluids into a reservoir to induce fractures and thus improve reservoir productivity. Microseismic event localization is used to locate created fractures. ...
  • Malcolm, Alison E.; de Hoop, Maarten V. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2010)
    It is well known that reverse-time migration is capable of correctly imaging multiply scattered energy. To do this, one of the interfaces from which the waves scatter must be included in the background velocity model. ...
  • Alshammery, Hafiz J.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1998)
    The goal of this paper is to study the accuracy of estimating the Quality Factor (Q) from ultrasonic pre-stack P-wave reflection data. Q is estimated by applying the spectral ratio method to the top and bottom reflections ...
  • Cheng, N. Y.; Cheng, C. H.; Toksoz, M. N. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1990)
    The in situ permeability of a formation is obtained by the inversion of Stoneley wave phase velocity and attenuation, which are evaluated by applying the Extended Prony's method to the array sonic logging data. The Maximum ...
  • Tang, Xiaoming; Chi, Shihong; Zhu, Zhenya (Massachusetts Institute of Technology. Earth Resources Laboratory, 2006)
    Deepwater reservoirs use highly deviated wells to reduce cost and enhance hydrocarbon recovery. Due to the strong anisotropic nature of many of the marine sediments, anisotropic seismic imaging and interpretation can improve ...
  • Willis, M.E. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1983)
    Common source velocities and borehole compensated (BC) estimates have been used to obtain formation velocity estimates from full waveform acoustic logs (Willis and Toksoz, 1982). With both of these methods the ...
  • Paternoster, Benoit J. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)
    Spatial resolution of sonic logs is greatly affected by the minimum spacing between receivers. Improvements can be made, however, when the spatial sampling of the formation is less than the minimum spacing. This paper ...
  • Poliannikov, Oleg V. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2010-04-26)
    Interferometry is a method of redatuming physical sources to receiver locations. Under idealized assumptions stacking the cross correlogram of the two common receiver gathers yields a bandlimited Green's function between ...
  • Gonguet, Christophe; Coyner, Karl B.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)
    The spectral ratio method is used to calculate the quality factor (Q) in porous rock samples at ultrasonic frequencies (0.3 - 1.5 MHz). The data were collected using the pulse transmission technique with aluminum used ...
  • Tarif, P. A.; Wilkens, R. H.; Cheng, C. H.; Paillet, F . L. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1988)
    Compressional and shear wave velocities were measured at confining pressures up to 200 MPa for twelve core samples from the depth interval of 600 to 2600 m in the California State 2-14 borehole. Samples were selected to ...
  • Reppert, Philip M.; Morgan, F. Dale (Massachusetts Institute of Technology. Earth Resources Laboratory, 1998)
    Frequency dependent streaming potentials were measured on a glass capillary, porous filter, and a sample of Boise sandstone. The pore diameters for these three samples range from 1 millimeter to 34 micrometers. The ...
  • Burns, D. R.; Thompson, D. R.; Cheng, C. H. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1990)
    Using some new processing of the multichannel sonic (MCS) log data from Site 418A, the resulting P, S, and Stoneley wave velocity estimates and apparent attenuation were integrated with the natural gamma, spectral gamma, ...
  • Juanes, Ruben; Dub, Francois-Xavier (Massachusetts Institute of Technology. Earth Resources Laboratory, 2008)
    We present a variational multiscale mixed finite element method for the solution of Darcy flow in porous media, in which both the permeability field and the source term display a multiscale character. The formulation ...
  • Poliannikov, Oleg V. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2008-06-16)
    We present a new approach to the problem of detecting point diffractors from active source surface seismic data. We formulate an optimization problem in the configuration space of possible collections of scatterers and ...
  • Rodi, William; Li, Yingping; Cheng, C. H. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1993)
    This paper examines the problem of locating microearthquakes induced by hydraulic fracturing using seismic arrival time data. In addition to the use of absolute arrival times measured for individual events, we consider ...
  • Lu, Rongrong; Rao, Rama V. N.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 2003)
    The sound field of finite dipole acoustic transducers in a steel tool was investigated and their horizontal by measuring their vertical radiation patterns in water at two different frequencies. Measurements were also made ...
  • Tao, Guo; Cheng, Ningya; Zhu, Zhenya; Cheng, C. H. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1995)
    Four methods for analyzing azimuthal anisotropy from dipole logging data are described and attempted in this paper. These techniques are based on the phenomena of flexural wave splitting in anisotropic materials and are ...
  • Tao, Guo; Cheng, Arthur C. H.; Toksoz, M. N. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1997)
    Three methods for analyzing azimuthal anisotropy from cross-dipole logs are applied to data from the Powder River Basin in Wyoming. These techniques are based on the phenomena of flexural wave splitting in anisotropic ...
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