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Browsing Earth Resources Laboratory by Title

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  • P and SV waves 3-D Numerical Modeling of AVOA from Heterogeneous Fractured Reservoirs 
    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 ...
  • P And S Wave Velocity Determination 
    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 ...
  • Passive Seismic Tomography Using Induced Seismicity at a Petroleum Field in Oman 
    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 ...
  • Permeability Estimation From Velocity Anisotropy In Fractured Rock 
    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 ...
  • Permeability Estimation From Velocity Anisotropy In Fractured Rock 
    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 ...
  • Petroleum Source Rock Logging 
    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 ...
  • Physical Properties of a Set of Sandstones, III: the Effects Of Fine Grained Pore Filling Material on Compressional Wave Velocity 
    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 ...
  • Polarization Of Flexural Waves In An Anisotropic Borehole Model 
    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 ...
  • Pore Geometry And Permeability Modeling From Pressure Dependence Of Transport Properties In Sandstone 
    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 ...
  • Pore Scale Modeling of Rock Properties and Comparison to Laboratory Measurements 
    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 ...
  • Pore-Scale Simulation Of Experimentally Realizable, Oscillatory Flow In Porous Rock 
    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 ...
  • The propagation and linkage of normal faults: Insights from the Strathspey-Brent-Statfjord fault array, northern North Sea 
    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 ...
  • Propagation Of Flexural Waves In An Azimuthally Anisotropic Borehole Model 
    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 ...
  • Quantitative tools for seismic stratigraphy and lithology characterization 
    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 ...
  • Radiation Patterns Of Compressional And Shear Transducers At The Surface Of An Elastic Half Space 
    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 ...
  • Rapid 3-D Raytracing For Optimal Seismic Survey Design 
    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 ...
  • Recursive Imaging with Multiply-Scattered Waves Using Partial Image Regularization: A North Sea Case Study 
    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 ...
  • Redatumming Through a Salt Canopy – Another Salt Flank Imaging Strategy 
    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 ...
  • Reflection Moveout Inversion For Horizontal Transverse Isotropy: Accuracy And Limitation 
    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 ...
  • Reflection Moveout Inversion In Azimuthally Anisotropic Media: Accuracy, Limitation, And Acquisition 
    AI-Dajani, AbdulFattah; Alkhalifah, Tariq; Morgan, Dale (Massachusetts Institute of Technology. Earth Resources Laboratory, 1999)
    Parameter estimation from elliptical variations in the normal-moveout (NMO) velocity in azimuthally anisotropic media is sensitive to the angular separation between the survey lines in 2D, or equivalently source-to-receiver ...
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