Now showing items 252-271 of 456

    • Joint flow-seismic inversion for characterizing fractured reservoirs: theoretical approach and numerical modeling 

      Kang, Peter K.; Zheng, Yingcai; Fang, Xinding; Wojcik, Rafal; McLaughlin, Dennis; e.a. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2013)
      Traditionally, seismic interpretation is performed without any account of the flow behavior. Here, we present a methodology to characterize fractured geologic media by integrating flow and seismic data. The key element of ...
    • Joint microseismic event location with uncertain velocity 

      Poliannikov, Oleg V.; Prange, Michael; Malcolm, Alison E.; Djikpesse, Hugues (Massachusetts Institute of Technology. Earth Resources Laboratory, 2013)
      We study the problem of the joint location of seismic events using an array of receivers. We show that locating multiple seismic events simultaneously is advantageous compared to the more traditional approaches of locating ...
    • Kinematic redatuming by two source interferometry 

      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 ...
    • Laboratory Borehole Model 

      Shortt, E. R. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1986)
      An experimental method for acquisition offull waveform acoustic logging (FWAL) data from scaled laboratory borehole/formation models is under development. A spark-gap source, fabricated in the lab, is used in conjunction ...
    • Laboratory Measurements of Attenuation in Rocks at Ultrasonic Frequencies 

      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 ...
    • Laboratory Studies Of The Acoustic Properties Of Samples From The Salton Sea Scientific Drilling Project And Their Relation To Microstructure And Field Measurements 

      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 ...
    • Laboratory Study Of Frequency Dependent Streaming Potentials 

      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 ...
    • Lithologic Cycles And Paleo Fluid Flow Channels In Old Oceanic Crust From Geophysical Logs At ODP Site 418A 

      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, ...
    • A locally conservative variational multiscale method for the simulation of porous media flow with multiscale source term 

      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 ...
    • Locating point diffractors in layered media by spatial dynamics 

      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 ...
    • Location Of Microearthquakes Induced By Hydraulic Fracturing 

      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 ...
    • Logging in Multilayered Saturated Porous Formations 

      Schmitt, D. P.; Cheng, C. H.; Toksoz, M. N. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1987)
      We present a general formulation based on the Thomson-Haskell method which allows the study of complex models. The surrounding formation may be composed of several coaxial porous shells or of a combination of both porous ...
    • Measured radiation patterns of the scale model dipole tool 

      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 ...
    • Measurements Of Shear-Wave Azimuthal Anisotropy From Ultrasonic Dipole Data 

      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 ...
    • Measurements Of Shear-Wave Azimuthal Anisotropy With Cross-Dipole Logs 

      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 ...
    • Meeting Agenda 

      Massachusetts Institute of Technology. Earth Resources Laboratory (Massachusetts Institute of Technology. Earth Resources Laboratory, 2007)
      Meeting agenda for the Earth Resources Laboratory 2007 Industry Consortia Meeting.
    • A Method of Measuring Acoustic Wave Attenuation in the Laboratory 

      Tang, X. M.; Toksoz, M. N.; Tarif, P. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1987)
      The measurement of attenuation is performed by directly determining the attenuation operator (or the impulse response of the medium) in the time domain. In this way, it is possible to separate the attenuation operator ...
    • Microquake seismic interferometry with SVD enhanced Green's function recovery 

      Melo, Gabriela; Malcolm, Alison E. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2011)
      The conditions under which seismic interferometry (SI) leads to the exact Green’s function (GF) are rarely met in practice, resulting in errors in the recovered GF. To alleviate this problem, we employ additional information ...
    • Model-guided Geosteering for Horizontal Drilling 

      Song, Fuxian; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 2009)
      Horizontal drilling is an important development in the petroleum industry and it relies heavily on guiding the drill bit with the aid of sonic logging, i.e. geosteering. The quality of sonic imaging depends heavily on ...
    • Modeling and Inversion of Self Potential Data 

      Minsley, Burke J. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2007-06)
      This dissertation presents data processing techniques relevant to the acquisition, modeling, and inversion of self-potential data. The primary goal is to facilitate the interpretation of self-potentials in terms of the ...