Browsing ERL Industry Consortia Technical Reports by Title

Now showing items 319-338 of 456

    • 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 ...

    • 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 ...

    • Passive Seismic Tomography Using Induced Seismicity at a Petroleum Field in Oman 

      Kindy, Fahad; Zhang, Haijiang; Sarkar, Sudipta; Toksoz, M. Nafi; Kuleli, Huseyin Sadi; e.a. (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 Field Data 

      Burns, D. R.; Cheng, C. H.; Schmitt, D. P.; Toksoz, M. N. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1987)
      Strong correlations exist between core measured permeability values and the phase velocity and attenuation of the tube wave obtained from full waveform acoustic logs. A number of authors have applied the Biot theory to ...

    • 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 ...

    • 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 ...

    • 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 

      Zhan, Xin; Schwartz, Larry; Smith, Wave; Toksoz, M. Nafi; Morgan, Frank Dale (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 ...

    • Predicting stress-induced anisotropy around a borehole 

      Fang, Xinding; Fehler, Michael; Zhu, Zhenya; Chen, Tianrun; Brown, Stephen; e.a. (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 ...

    • 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 ...

    • Real-time ensemble control with reduced-order modeling 

      Lin, Binghuai; McLaughlin, Dennis (Massachusetts Institute of Technology. Earth Resources Laboratory, 2013)
      The control of spatially distributed systems is often complicated by significant uncertainty about system inputs, both time-varying exogenous inputs and time-invariant parameters. Spatial variations of uncertain parameters ...

    • 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 ...