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  • 1
    GFZ publications
    GFZ publications
    Deformation mechanisms rheology microstructures : Neustadt an der Weinstraße, 22.-24. March 1999 (1999)
    Potsdam : GeoForschungsZentrum
    Details Availability
    Call number: AR 99.0297
    Type of Medium: GFZ publications
    Pages: 172 S.
    Classification:
    Petrophysics
    Branch Library: GFZ Library
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  • 2
    Monograph available for loan
    Monograph available for loan
    Bruchtektonik, Faltung und Schollenbau im westlichen hohen Atlas bei Marrakech/Marokko (1984)
    Bonn
    Details Availability
    Call number: G 8636
    Type of Medium: Monograph available for loan
    Pages: 171 S. : Ill., graph. Darst. + 5 Beil.
    Note: Bonn, Univ., Diss., 1983
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 3
    Series available for loan
    Series available for loan
    Tectonics on Human Time Scale : Strockhövel, June 1-4, 2004 ; abstract volume (2004)
    Bochum : Inst. für Geologie, Mineralogie und Geophysik der Ruhr Univ.
    Associated volumes
    Details Availability
    Call number: S 02.0314 (3)
    In: Bochumer geowissenschaftliche Arbeiten
    Type of Medium: Series available for loan
    Pages: XIV, 278 S. , Ill., graph. Darst.
    Series Statement: Bochumer geowissenschaftliche Arbeiten 3
    Classification:
    Tectonics
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 4
    Unknown
    Rock Damage and Fluid Transport, Part I (2006)
    Basel, Boston, Berlin : Birkhäuser
    Details
    Keywords: excavation ; oil production ; pore space ; rock damage ; well production
    Description / Table of Contents: Mechanical properties and fluid transport in rocks are intimately linked as deformation of a solid rock matrix immediately affects the pore space and permeability. This may result in transient or permanent changes of pore pressures and effective pressures causing rock strength to vary in space and time. Fluid circulation and deformation processes in crustal rocks are coupled, producing significant complexity of mechanical and fluid transport behavior. This often poses severe technical and economic problems for reservoir and geotechnical engineering projects involved in oil and gas production, CO2 sequestration, mining and underground waste disposal. For example, the depletion of hydrocarbon and water reservoirs leading to compaction may have adverse effects on well production. Solution/precipitation processes modify porosity and affect permeability of aquifers and reservoir rocks. Fracture damage from underground excavation will critically influence the long-term stability and performance of waste storage. Part I of this topical volume covers mainly the nucleation and evolution of crack damage in rocks, new or modified techniques to measure rock fracture toughness and a discussion of upscaling techniques relating mechanical and fluid transport behaviour in rocks at different spatial scales. Part II, to be published later in 2006, will include studies investigating the coupling of rock deformation and fluid flow.
    Pages: Online-Ressource (278 Seiten)
    ISBN: 9783764377113
    URL: http://link.springer.com/journal/24/163/5/
    Language: English
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    E-BOOK
  • 5
    Unknown
    Rock Damage and Fluid Transport, Part II (2006)
    Basel, Boston, Berlin : Birkhäuser
    Details
    Keywords: excavation ; oil production ; pore space ; rock damage ; well production
    Description / Table of Contents: Mechanical properties and fluid transport in rocks are intimately linked as deformation of a solid rock matrix immediately affects the pore space and permeability. The coupling of fluid circulation and deformation processes in crustal rocks results in significant complexity of the mechanical and fluid transport behavior. This often poses severe technical and economic problems for reservoir and geotechnical engineering projects involved in oil and gas production, CO2 sequestration, mining and underground waste disposal. The volume results from the 5th Euroconference on Rock Physics and Geomechanics, which was held in Potsdam, Germany in September 2004. Part I of the topical volume mainly contains contributions investigating the nucleation and evolution of crack damage in rocks, new or modified techniques to measure rock fracture toughness and a discussion of upscaling techniques relating mechanical and fluid transport behavior in rocks at different spatial scales. Part II contains contributions discussing fluid flow and transport in rocks as observed on the laboratory scale and in boreholes. The evolution of rock damage pertinent to the stability of underground excavations is studied and scaling relations of elastic properties and seismic events are discussed.
    Pages: Online-Ressource (210 Seiten)
    ISBN: 9783764379933
    URL: http://link.springer.com/journal/24/163/10/
    Language: English
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    E-BOOK
  • 6
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    Strain partitioning and stress rotation at the North Anatolian fault zone from aftershock focal mechanisms of the 1999 Izmit Ms-2dwus0 = 7.4 earthquake (2006)
    In:  Geophysical Journal International, Warszawa, Elsevier, vol. 166, no. 1, pp. 373-385, pp. B02309, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 2006
    Keywords: Stress ; Fault plane solution, focal mechanism ; Aftershocks ; Earthquake ; Fault zone ; NAF ; GJI ; aftershocks, ; fault ; plane ; solutions, ; seismotectonics, ; stress ; tensor ; inversion ; Structural geology ; Coulomb ; Turkey
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    BIBLIOGRAPHY SEISMOLOGY
  • 7
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    Fracture process zone in granite (2000)
    In:  J. Geophys. Res., Taipei, 3-4, vol. 105, no. B10, pp. 23,651-23,661, pp. 2221, (ISSN: 1340-4202)
    Details
    Publication Date: 2000
    Keywords: Laboratory measurements ; Fracture ; Rock mechanics ; Acoustic emission ; Fault plane solution, focal mechanism ; Energy (of earthquakes) ; JGR ; 5102 ; Physical ; properties ; of ; rocks ; Acoustic ; properties ; 5104 ; Fracture ; and ; flow ; 5112 ; Microstructure ; Fracture veloc. ; 5144 ; Wave ; attenuation
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    BIBLIOGRAPHY SEISMOLOGY
  • 8
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    Stress tensor changes related to fluid injection at The Geysers Geothermal Field, California (2013)
    Wiley
    Details
    Publication Date: 2013-04-04
    Description: [1]  Studying variations of the stress field in reservoirs caused by massive fluid injection is important towards an improved understanding of geomechanical processes involved. We report on spatio-temporal variations of the local stress tensor orientation at The Geysers geothermal field, California. We apply two stress inversion methods with detailed uncertainty assessments using a selection of events recorded between 2007 and 2012. Our results clearly indicate variations in the orientation of the principal stress axes for the reservoir as a whole showing a normal faulting regime at the reservoir depth between 2 and 3.7 km bounded by a strike-slip regime above and below. Analyzing the temporal evolution of the stress tensor orientation for a prominent seismicity cluster we observe a clear correlation of changes in orientation for σ 1-3 with the highest injection rates. These results suggest that temporal changes in the stress tensor orientation could contribute to characterize reservoirs during stimulation.
    Print ISSN: 0094-8276
    Electronic ISSN: 1944-8007
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 9
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    Analysis of Microseismicity Framing ML 〉 2.5 Earthquakes at The Geysers Geothermal Field, California (2019)
    Wiley
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    Publication Date: 2019
    Description: Abstract Preparatory mechanisms accompanying or leading to nucleation of larger earthquakes have been observed at both laboratory and field scales, but conditions favoring the occurrence of observable preparatory processes are still largely unknown. In particular, it remains a matter of debate why some earthquakes occur spontaneously without noticeable precursors as opposed to events that are preceded by an extended failure process. In this study, we have generated new high‐resolution seismicity catalogs framing the occurrence of 20 ML 〉 2.5 earthquakes at The Geysers geothermal field in California. To this end, a seismicity catalog of the 11 days framing each large event was created. We selected 20 sequences sampling different hypocentral depths and hydraulic conditions within the field. Seismic activity and magnitude frequency distributions displayed by the different earthquake sequences are correlated with their location within the reservoir. Sequences located in the northwestern part of the reservoir show overall increased seismic activity and low b values, while the southeastern part is dominated by decreased seismic activity and higher b values. Periods of high injection coincide with high b values and vice versa. These observations potentially reflect varying differential and mean stresses and damage of the reservoir rocks across the field. About 50% of analyzed sequences exhibit no change in seismicity rate in response to the large main event. However, we find complex waveforms at the onset of the main earthquake, suggesting that small ruptures spontaneously grow into or trigger larger events.
    Print ISSN: 2169-9313
    Electronic ISSN: 2169-9356
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 10
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    Effects of long-term fluid injection on induced seismicity parameters and maximum magnitude at northwestern The Geysers geothermal field (2015)
    Wiley
    Details
    Publication Date: 2015-10-03
    Description: The long-term temporal and spatial changes in statistical, source and stress characteristics of one cluster of induced seismicity recorded at The Geysers geothermal field (US) are analyzed in relation to the field operations, fluid migration and constraints on the maximum likely magnitude. Two injection wells, Prati-9 and Prati-29, located in the northwestern part of the field and their associated seismicity composed of 1,776 events recorded throughout a seven-year period were analyzed. The seismicity catalog was relocated and the source characteristics including focal mechanisms and static source parameters were refined using first-motion polarity, spectral fitting and mesh spectral ratio analysis techniques. The source characteristics together with statistical parameters ( b value) and cluster dynamics were used to investigate and understand the details of fluid migration scheme in the vicinity of injection wells. The observed temporal, spatial and source characteristics were clearly attributed to fluid injection and fluid migration towards greater depths, involving increasing pore pressure in the reservoir. The seasonal changes of injection rates were found to directly impact the shape and spatial extent of the seismic cloud. A tendency of larger seismic events to occur closer to injection wells and a correlation between the spatial extent of the seismic cloud and source sizes of the largest events was observed suggesting geometrical constraints on the maximum likely magnitude and its correlation to the average injection rate and volume of fluids present in the reservoir.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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