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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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  • Zhu, Xiang; Shen, Feng; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1997)
    We study the effects of fracture-induced anisotropy and lateral fracture density heterogeneity on the reflected P and SV wave amplitude variation with offset and azimuth (AVOA), using 3-D finite-difference simulations. The ...
  • Willis, M. E.; Toksoz, M.N. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1983)
    There are three general methods that can be used to determine formation velocities from full waveform logs. The first approach is to make use of the data from the entire waveform. This type of velocity analysis is performed ...
  • Kindy, Fahad; Zhang, Haijiang; Sarkar, Sudipta; Toksoz, M. Nafi; Kuleli, Huseyin Sadi; Al-Kindy, Fahad (Massachusetts Institute of Technology. Earth Resources Laboratory, 2009-05-19)
    A borehole network consisting of 5 monitoring wells was used to monitor the induced seismicity at a producing petroleum field for a period of about 11 months. Nearly 5400 microseismic events were analyzed and utilized ...
  • Gibson, Richard L., Jr.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1989)
    Cracks in a rock mass subjected to a uniaxial stress will be preferentially closed depending on the angle between the fracture normal and the direction of the applied stress. If the prestress fracture distribution is ...
  • Gibson, Richard L., Jr.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1990)
    Cracks in a rock mass subjected to a uniaxial stress will be preferentially closed depending on the angle between the fracture normal vectors and the direction of the applied stress. If the prestress fracture orientation ...
  • Mendelson, James (Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)
    Regional distributions of organic content are an important aid in developing basin evolution and hydrocarbon generation models. An approach to evaluate hydrocarbon source rocks using resistivity, sonic, density, neutron ...
  • Wilkens, R. H.; Simmons, G.; Wissler, T. M.; Caruso, L. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1985)
    We have used aspect ratio modeling to explain the measured compressional wave velocities of twenty different dry sandstone samples with varying clay contents at a single confining pressure of 0.5 kbar. Velocities of the ...
  • Zhu, Zhenya; Cheng, C. H.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1995)
    Two modes of flexural waves can be generated by a dipole source in an anisotropic borehole. Their velocities are related to those of the fast and slow shear waves in the formation. The particle motions and the polarization ...
  • Bernabe, Yves (Massachusetts Institute of Technology. Earth Resources Laboratory, 1989)
    In this paper, a model of the pore geometry of sandstones is proposed. Three categories of pores are considered: large spherical pores at 4-grain vertices, tube-like throats at 3-grain edges and narrow sheet-like throats ...
  • Smith, Wave; Schwartz, Larry; Toksoz, M. Nafi; Morgan, Frank Dale; Zhan, Xin (Massachusetts Institute of Technology. Earth Resources Laboratory, 2009)
    The microstructure of a porous medium and the physical characteristics of the solid and fluid phases determine the macroscopic transport properties of the medium. The purpose of this paper is to test numerical calculations ...
  • Olson, John F. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1999)
    We report new simulations of oscillating flow in porous rock. Our goal is to better understand the frequency dependence of pore-scale fluid motion, which should ultimately help us to interpret attenuation and electroseismic ...
  • 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 ...
  • McLeod, Aileen E.; Dawers, Nancye H.; Underhill, John R. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2001)
    Through examination of the scaling relations of faults and the use of seismic stratigraphic techniques, we demonstrate how the temporal and spatial evolution of the fault population in a half-graben basin can be accurately ...
  • Zhu, Zhenya; Cheng, C. H.; Toksoz, M. N. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1993)
    Flexural waves generated by a dipole source have been studied theoretically and used to estimate the shear parameters of a formation. The basic principles and main properties of flexural waves propagating in a borehole ...
  • Herrmann, Felix (Massachusetts Institute of Technology. Earth Resources Laboratory, 2001)
    Seismological images represent maps of the earth's structure. Apparent bandwidth limitation of seismic data prevents successful estimation of transition sharpness by the multiscale wavelet transform. We discuss the application ...
  • Tang, X. M.; Zhu, Zhenya; Toksoz, M. N. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1992)
    The radiation patterns of an elastic wave field generated by circular plane compressional and shear transducers are derived using the method of steepest descent. These patterns contain both effects of the elastic half ...
  • Zhang, Jie; Lavely, Eugene; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1997)
    A useful approach to optimal seismic survey design is to simulate the seismic response for a suite of a priori subsurface models and shot-receiver templates. The response can be used to evaluate many criteria such as ...
  • Malcolm, Alison E.; de Hoop, Maarten V.; Ursin, Bjorn (Massachusetts Institute of Technology. Earth Resources Laboratory, 2010)
    As more resources are directed toward reverse-time migration an accurate velocity model, including strong reflectors, is necessary to form a clear image of the subsurface. This is of particular importance in the vicinity ...
  • Lu, Rongrong; Willis, Mark E.; Campman, Xander; Ajo-Franklin, Jonathan B.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 2007)
    We describe a new short cut strategy to image the sediments and salt edge around a salt flank through an overburden salt canopy. We demonstrate its performance and capabilities on a synthetic acoustic seismic data from ...
  • Al-Dajani, AbdulFattah; Alkhalifah, Tariq (Massachusetts Institute of Technology. Earth Resources Laboratory, 1998)
    Horizontal transverse isotropy (HTI) is the simplest azimuthally anisotropic model used to describe vertical fracturing in an isotropic matrix. Using the elliptical variation of P-wave normal-moveout (NMO) velocity with ...
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