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  • 1
    Monograph available for loan
    Monograph available for loan
    Microseismicity : a tool for reservoir characterization (2008)
    DB Houten : EAGE Publ.
    Details Availability
    Call number: M 09.0019
    Description / Table of Contents: Contents :1. Introduction2. Seismicity and linear diffusion of pore pressure 3. Triggering front of seismicity 4. Seismicity and hydraulic anisotropy 5. Seismicity in hydraulically heterogeneous media 6. Back front of seismicity 7. Strength of pre-existing fractures 8. Spatial density of seismicity 9. Magnitudes of induced events 10. Seismicity induced by hydraulic fracturing
    Type of Medium: Monograph available for loan
    Pages: 67 S.
    ISBN: 9789073781702
    Series Statement: Education Tour Series CIS
    Classification:
    Geophysical Exploration, Geophysical Prospecting
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 2
    Monograph available for loan
    Monograph available for loan
    Fluid-induced seismicity (2015)
    Cambridge : Cambridge Univ. Press
    Details Availability
    Call number: 5/M 15.0118 ; 5/M 16.24249
    Description / Table of Contents: The characterisation of fluid transport properties of rocks is one of the most important, yet difficult, challenges of reservoir geophysics, but is essential for optimal development of hydrocarbon and geothermal reservoirs. This book provides a quantitative introduction to the underlying physics, application, interpretation, and hazard aspects of fluid-induced seismicity with a particular focus on its spatio-temporal dynamics. It presents many real data examples of microseismic monitoring of hydraulic fracturing at hydrocarbon fields and of stimulations of enhanced geothermal systems. The author also covers introductory aspects of linear elasticity and poroelasticity theory, as well as elements of seismic rock physics and mechanics of earthquakes, enabling readers to develop a comprehensive understanding of the field. Fluid-Induced Seismicity is a valuable reference for researchers and graduate students working in the fields of geophysics, geology, geomechanics and petrophysics, and a practical guide for petroleum geoscientists and engineers working in the energy industry.
    Type of Medium: Monograph available for loan
    Pages: xiii, 276 S. : graph. Darst., Ill.
    ISBN: 9780521884570
    Classification:
    Seismology
    Location: Reading room
    Location: Reading room
    Branch Library: GFZ Library
    Branch Library: GFZ Library
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  • 3
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    Understanding Slow Deformation Before Dynamic Failure (2011)
    Springer Science+Business Media B.V.
    Details
    Publication Date: 2017-04-04
    Description: Slow deformation and fracturing have been shown to be leading mechanisms towards failure, marking earthquake ruptures, flank eruption onsets and landslide episodes. The common link among these processes is that populations of microcracks interact, grow and coalesce into major fractures. We present (a) two examples of multidisciplinary field monitoring of characteristic “large scale” signs of impending deformation from different tectonic setting, i.e. the Ruinon landslide (Italy) and Stromboli volcano (Italy) (b) the kinematic features of slow stress perturbations induced by fluid overpressures and relative modelling; (c) experimental rock deformation laboratory experiments and theoretical modelling investigating slow deformation mechanisms, such stress corrosion crack growth. We propose an interdisciplinary unitary and integrated approach aimed to: (1) transfer of knowledge between specific fields, which up to now aimed at solve a particular problem; (2) quantify critical damage thresholds triggering instability onset; (3) set up early warning models for forecasting the time of rupture with application to volcanology, seismology and landslide risk prevention.
    Description: Published
    Description: 229-247
    Description: 2.3. TTC - Laboratori di chimica e fisica delle rocce
    Description: reserved
    Keywords: Stromboli volcano · Landslides ; 02. Cryosphere::02.02. Glaciers::02.02.01. Avalanches ; 04. Solid Earth::04.07. Tectonophysics::04.07.05. Stress ; 04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring ; 05. General::05.02. Data dissemination::05.02.01. Geochemical data ; 05. General::05.02. Data dissemination::05.02.02. Seismological data ; 05. General::05.02. Data dissemination::05.02.03. Volcanic eruptions ; 05. General::05.08. Risk::05.08.01. Environmental risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: book chapter
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  • 4
    Electronic Resource
    Electronic Resource
    Temperature variation of the H0 acidity function in aqueous sulfuric acid solution (1969)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 91 (1969), S. 6654-6662 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01052a021
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  • 5
    Electronic Resource
    Electronic Resource
    Consistency of the indicator overlap method with linear free energy--enthalpy correlations (1970)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 92 (1970), S. 1567-1568 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00709a023
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  • 6
    Electronic Resource
    Electronic Resource
    The effect of random isotropic inhomogeneities on the phase velocity of seismic waves (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 127 (1996), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: In this paper we study, theoretically and numerically, the influence of 2-D and 3-D random isotropic stationary inhomogeneities on the phase velocities of the transmitted compressional wavefield of an initially plane (or spherical) wave. Due to scattering by the inhomogeneities the wavefield becomes distorted as the wave propagates through the medium. The traveltimes fluctuate when considering different wavefield registrations acquired at the points of surfaces that are parallel to the wavefront of the initial wave. It is usually observed that the slowness obtained from the averaged traveltime differs from the averaged slowness of (he medium. In the geophysical lilerature this effect has been termed the ‘velocity shift’.Using the Rytov approximation we establish formulas for the frequency- and travel-distance-dependent phase velocity of the transmitted wavefield in 2-D and 3-D randomly inhomogeneous media. We also compare our analytical results with finite-difference simulations. Good agreement between numerical simulations and theory is observed. The low-frequency limit of our analytical results coincides with the known effective-medium limit of the phase velocity in statistically isotropic inhomogeneous fluids with constant densities. In the high-frequency limit our results coincide with the results previously obtained by the ray-perturbation theory. However, in contrast to the ray theory, our description is not restricted to media with differentiate correlation functions of fluctuations. Moreover, our results quantify the frequency dependence of the velocity shift in the intermediate-frequency range. This frequency dependence is of major importance for estimating this effect in realistic situations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1996.tb04057.x
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  • 7
    Electronic Resource
    Electronic Resource
    Seismic Attenuation By Scattering: Theory and Numerical Results (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 114 (1993), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Estimates of seismic wave attenuation are strongly affected by scattering. Scattering is an important effect caused by interaction of seismic wavefields with inhomogeneities of hydrocarbon reservoirs, Earth's crust and mantle. In order to study the contribution of scattering to apparent attenuation we consider plane-wave propagation in acoustic 2-D and 3-D inhomogeneous media. Different attenuation estimates result depending on what wavefield function is being averaged during corresponding processing. By wave-theoretical analysis and high-order finite difference modelling in two dimensions we show that scattering attenuation estimates derived from the mean of amplitude spectra and from the mean logarithm of amplitude spectra depend on travel distance. For not too long travel distances, where the coherent part of the wavefield dominates, we give an analytical description of these estimates. In 2-D and 3-D the relations are established between the autocorrelation functions of velocity fluctuations of a random medium and the autocorrelation functions of amplitude and phase fluctuations on a receiver line perpendicular to the general propagation direction of an originally plane wave. For long distances, where the wavefield fluctuates strongly, we show that both mean logarithm of amplitude and logarithm of mean amplitude tend to constants. They differ approximately by a factor two in both scattering regimes. the scattering attenuation coefficient of the meanfield is not dependent on travel distance. We compared our theoretical results with numerical calculations and found excellent agreements. the concept presented clarifies the nature of seismic Q estimations in the presence of scattering and can help to yield statistical earth models from seismic data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1993.tb03925.x
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  • 8
    Electronic Resource
    Electronic Resource
    Elastic waves scattering and radiation by fractal inhomogeneity of a medium (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 110 (1992), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: I obtain the Born approximation for the scattered intensity I, the differential cross-sections σd, and the total scattering cross-sections σ of elastic wavefields scattered by a mass fractal, an object with a fractal surface and a fragment of a turbulent medium. The results for I and σd are valid for an arbitrary anisotropic random discrete or continuous inhomogeneity and they are in agreement with the well known results for discrete inclusions (Gubernatis, Domany & Krumhansl 1977b). For fractal inhomogeneities I show that: (1) for small angle scattering I∝ω4+ω(sin θ/2)n̈, where θ is a scattering angle and the constant n̈ depends linearly on the fractal dimension; (2) σ∝ω4+ω; (3) σ∝ω4+n̈ if n̈〉-2 and σ∝ω2 if n̈≤ -2; and (4) the Fourier transform of the correlation function of the wavefield Γ which is coherently radiated by white noise point sources distributed on fractal objects obeys [Γ] ∝ωσ. Applying the results for σd I show that the model of inhomogeneities with a fractal surface is in agreement with the fractal dimensions of some fault systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1992.tb02094.x
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  • 9
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    Temperature variation of the H0 acidity function in aqueous sulfuric acid solution (1969)
    American Chemical Society
    Details
    Publication Date: 1969-11-01
    Print ISSN: 0002-7863
    Electronic ISSN: 1520-5126
    Topics: Chemistry and Pharmacology
    Published by American Chemical Society
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  • 10
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    Seismic reflectivity of hydraulic fractures approximated by thin fluid layers (2013)
    Society of Exploration Geophysicists (SEG)
    Details
    Publication Date: 2013-07-13
    Description: We have analyzed the angle-dependent reflectivity of microseismic wavefields at a hydraulic fracture, which we modeled as an ideal thin fluid layer embedded in an elastic, isotropic solid rock. We derived full analytical solutions for the reflections of an incident P-wave, the P-P and P-S reflection coefficients, as well as for an incident S-wave, and the S-S and S-P reflection coefficients. The rather complex analytical solutions were then approximated and we found that these zero-thickness limit approximations are in good agreement with the linear slip model, representing a fracture at slip contact. We compared the analytical solutions for the P-P reflections with synthetic data that were derived using finite-difference modeling and found that the modeling confirmed our theoretical results. For typical parameters of microseismic monitoring by hydraulic fracturing, e.g., a layer thickness of $$h=0.001\mbox{--}0.01\hbox{ \hspace{0.17em} }\hbox{ \hspace{0.17em} }\mathrm{m}$$ and frequencies of $$f=50\mbox{--}400\hbox{ \hspace{0.17em} }\hbox{ \hspace{0.17em} }\mathrm{Hz}$$ , the reflection coefficients depend on the Poisson’s ratio. Furthermore, the reflection coefficients of an incident S-wave are remarkably high. Theoretical results suggested that it is feasible to image hydraulic fractures using microseismic events as a source and to solve the inverse problem, that is, to interpret reflection coefficients extracted from microseismic data in terms of reservoir properties.
    Print ISSN: 0016-8033
    Electronic ISSN: 1942-2156
    Topics: Geosciences , Physics
    Published by Society of Exploration Geophysicists (SEG)
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