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Browsing Earth Resources Laboratory by Title

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  • Imaging Geometry And Growth Rate Of A Hydraulic Fracture Zone By Locating Induced Microearthquakes 
    Li, Yingping; Cheng, C. H. (Massachusetts Institute of Technology. Earth Resources Laboratory, 1995)
    The hydraulic fracturing technique has become an important tool in the enhancement of hydrocarbons recovery, geothermal energy extraction, and solid waste disposal. The characterization of geometry parameters and growth ...
  • Imaging Hydraulic Fractures: Source Location Uncertainty Analysis At The UPRC Carthage Test Site 
    Li, Yingping; Zhu, Xianhuai; Cheng, Arthur C. H.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 1996)
    Hydraulic fracturing is a useful tool for enhancing gas and oil production. High-resolution seismic imaging of the fracture geometry and fracture growth process is the key in determining optimal spacing and location of ...
  • Imaging Salt Dome Flank and Dipping Sediments Using Time Reversed Acoustics 
    Lu, Rongrong; Willis, Mark E.; Campman, Xander; Ajo-Franklin, Jonathan B.; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 2006)
    In this paper we define the theory and basic principles to move (redatum) the surface shots from a walk away VSP to be as if they had been located in the borehole. We will refer to this theory using several of the terms ...
  • Imaging the Soultz Enhanced Geothermal Reservoir Using Double-Difference Tomography and Microseismic Data 
    Concha, Diego Alvaro Pinero (Massachusetts Institute of Technology. Earth Resources Laboratory, 2010-06)
    We applied the double-difference tomography method to image the P and S-wave velocity structure of the European Hot Dry Rock geothermal reservoir (also known as the Soultz Enhanced Geothermal System) at Soultz-sous-Forets, ...
  • Imaging With Reverse Vertical Seismic Profiles Using A Downhole, Hydraulic, Axial Vibrator 
    Krasovec, Mary; Turpening, Roger; Paulsson, Bjorn; Haldorsen, Jakob; Coates, Richard; Greaves, Robert (Massachusetts Institute of Technology. Earth Resources Laboratory, 2000)
    We present the analysis of a reverse vertical seismic profile (RVSP) acquired over a pinnacle reef in the northern Michigan reef trend. The survey exhibited two features of note: (1) a new, strong, downhole vertical ...
  • Improved Green’s functions from seismic interferometry 
    Poliannikov, Oleg V.; Willis, Mark E. (Massachusetts Institute of Technology. Earth Resources Laboratory, 2008-06-16)
    Under certain theoretical assumptions, the theory of seismic interferometry allows the construction of artificial (or virtual) sources and receivers at the locations of receivers in a physical experiment. This is done ...
  • An improved method for hydrofracture induced microseismic event detection and phase picking 
    Ay, Erkan; Song, Fuxian; Kuleli, Huseyin Sadi; Toksoz, M. Nafi; Zhang, Haijiang (Massachusetts Institute of Technology. Earth Resources Laboratory, 2010)
    The ability to detect small microearthquakes and identify their P and S phase arrivals is a key issue in hydrofracture downhole monitoring because of the low signal-to-noise ratios. We apply an array-based waveform ...
  • Improved Methods for Hydrofrac Event Detection and Phase Picking 
    Cornish, Bruce; Quirein, John; Ay, Erkan; Pei, Donghong; Zannoni, Steve; Song, Fuxian; Kuleli, Huseyin Sadi; Todreas, M. Nafi; Zhang, Haijiang (Massachusetts Institute of Technology. Earth Resources Laboratory, 2009)
    The ability to detect small microseismic events and identify their P and S phase arrivals is a key issue in hydraulic fracture monitoring because of the low signal-to-noise ratios. We propose a array-based waveform ...
  • In Situ, Nonlinear Soil Response Applying an Active Source 
    Johnson, Paul; Toksoz, M. Nafi; Morgan, Frank Dale; Pearce, Fred (Massachusetts Institute of Technology. Earth Resources Laboratory, 2009)
    Soil sites have a profound effect on ground motion during earthquakes due to their low wave speeds, layered structure, and nonlinear constitutive relationship. Measurements of nonlinear soil response under natural ...
  • In Situ Permeability Estimation: A Comparison Between Acoustic And NMR Logs 
    Chen, Wei; Burns, Daniel R.; Tang, Xiao-ming (Massachusetts Institute of Technology. Earth Resources Laboratory, 1999)
    Permeability estimates from acoustic logs (Stoneley waves) and NMR logs were compared using data from a geologic section consisting of sandstone and shale beds. The permeability results show very good correlation for ...
  • An integrated well data analysis for in-situ stress estimation 
    Grandi, Samantha K.; Rao, Rama V. N.; Huang, Xiaojun; Toksoz, M. Nafi (Massachusetts Institute of Technology. Earth Resources Laboratory, 2003)
    In this paper we obtain in-situ stress information based on two methods. The first one consists in matching borehole deformations to the modelling of linear poroelasticity equations around a hole in a plate that is subjected ...
  • Interferometric correlogram-space analysis 
    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 ...
  • Interferometric correlogram-space analysis 
    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 ...
  • Interferometric imaging of multiples in an RTM approach 
    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. ...
  • Interval Attenuation Estimation 
    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 ...
  • Inversion For Permeability From Stoneley Wave Velocity And Attenuation 
    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 ...
  • Inversion of Shear Wave Anisotropic Parameters in Strongly Anisotropic Formations 
    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 ...
  • Inversion Of Travel Time For Velocity 
    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 ...
  • Inversion of Travel Time for Velocity Using Multi-Spacing Sonic Tools 
    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 ...
  • 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 ...
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