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  • 1
    Monograph available for loan
    Monograph available for loan
    Deformation mechanisms, rheology and tectonics : [this volume is dedicated to the work of Hendrik Jan Zwart] (1990)
    London : The Geological Society
    Associated volumes
    Details Availability
    Call number: 9/M 92.0950 ; 9/M 92.1074 ; M 92.0410
    In: Geological Society special publication
    Description / Table of Contents: The 47 papers that make up this volume are gathered into eight groups that reflect current research themes: Role of fluid in rock deformation; Fracture and faulting; Instabilities and localization; Flow mechanisms and flow laws; Rock fabrics; Deformation of weak sediments; Experimental modelling using analogue materials; Deformation mechanisms and tectonics. Some of these sections contain review papers, presenting an introductory framework for those new to the subject but the volume is dominated by original research papers.
    Type of Medium: Monograph available for loan
    Pages: XV, 535 S. , Ill., graph. Darst., Kt.
    Edition: 1st ed.
    ISBN: 0903317583
    Series Statement: Geological Society special publication 54
    URL: http://sp.lyellcollection.org/content/54/1
    Classification:
    Petrophysics
    Language: English
    Note: Role of Fluids in Rock Deformation --- N. L. Carter, A. K. Kronenberg, J. V. Ross, and D. V. Wiltschko: Control of fluids on deformation of rocks / Geological Society, London, Special Publications, 54:1-13, doi:10.1144/GSL.SP.1990.054.01.01 --- Richard H. Sibson: Conditions for fault-valve behaviour / Geological Society, London, Special Publications, 54:15-28, doi:10.1144/GSL.SP.1990.054.01.02 --- James P. Evans: Textures, deformation mechanisms, and the role of fluids in the cataclastic deformation of granitic rocks / Geological Society, London, Special Publications, 54:29-39, doi:10.1144/GSL.SP.1990.054.01.03 --- Fracture and Faulting --- Susan M. Agar: Fracture evolution in the upper ocean crust: evidence from DSDP hole 504B / Geological Society, London, Special Publications, 54:41-50, doi:10.1144/GSL.SP.1990.054.01.04 --- Martin Casey and Gilles Wust: The calculation of bulk rheologies of structured materials and its application to brittle failure in shear / Geological Society, London, Special Publications, 54:51-55, doi:10.1144/GSL.SP.1990.054.01.05 --- S. J. D. Cox and L. Paterson: Damage development during rupture of heterogeneous brittle materials: a numerical study / Geological Society, London, Special Publications, 54:57-62, doi:10.1144/GSL.SP.1990.054.01.06 --- S. J. D. Cox: Velocity-dependent friction in a large direct shear experiment on gabbro / Geological Society, London, Special Publications, 54:63-70, doi:10.1144/GSL.SP.1990.054.01.07 --- Susan J. Hippler and Robert J. Knipe: The evolution of cataclastic fault rocks from a pre-existing mylonite / Geological Society, London, Special Publications, 54:71-79, doi:10.1144/GSL.SP.1990.054.01.08 --- Ian G. Main, Philip G. Meredith, Peter R. Sammonds, and Colin Jones: Influence of fractal flaw distributions on rock deformation in the brittle field / Geological Society, London, Special Publications, 54:81-96, doi:10.1144/GSL.SP.1990.054.01.09 --- G. Zulauf, G. Kleinschmidt, and O. Oncken: Brittle deformation and graphitic cataclasites in the pilot research well KTB-VB (Oberpfalz, FRG) / Geological Society, London, Special Publications, 54:97-103, doi:10.1144/GSL.SP.1990.054.01.10 --- Iain S. Stewart and Paul L. Hancock: Brecciation and fracturing within neotectonic normal fault zones in the Aegean region / Geological Society, London, Special Publications, 54:105-110, doi:10.1144/GSL.SP.1990.054.01.11 --- Teng-Fong Wong: Mechanical compaction and the brittle—ductile transition in porous sandstones / Geological Society, London, Special Publications, 54:111-122, doi:10.1144/GSL.SP.1990.054.01.12 --- Instabilities and Localization --- Russell K. Davies and Raymond C. Fletcher: Shear bands in a plastic layer at yield under combined shortening and shear: a model for the fault array in a duplex / Geological Society, London, Special Publications, 54:123-131, doi:10.1144/GSL.SP.1990.054.01.13 --- H. W. Green II and P. C. Burnley: The failure mechanism for deep-focus earthquakes / Geological Society, London, Special Publications, 54:133-141, doi:10.1144/GSL.SP.1990.054.01.14 --- B. E. Hobbs, H.-B. Mühlhaus, and A. Ord: Instability, softening and localization of deformation / Geological Society, London, Special Publications, 54:143-165, doi:10.1144/GSL.SP.1990.054.01.15 --- Eva M. Klaper: Reaction-enhanced formation of eclogite-facies shear zones in granulite-facies anorthosites / Geological Society, London, Special Publications, 54:167-173, doi:10.1144/GSL.SP.1990.054.01.16 --- David L. Olgaard: The role of second phase in localizing deformation / Geological Society, London, Special Publications, 54:175-181, doi:10.1144/GSL.SP.1990.054.01.17 --- A. Ord: Mechanical controls on dilatant shear zones / Geological Society, London, Special Publications, 54:183-192, doi:10.1144/GSL.SP.1990.054.01.18 --- E. Carrio-Schaffhauser, S. Raynaud, H. J. Latière, and F. Mazerolle: Propagation and localization of stylolites in limestones / Geological Society, London, Special Publications, 54:193-199, doi:10.1144/GSL.SP.1990.054.01.19 --- Flow Mechanisms and Flow Laws --- R. C. M. W. Franssen and C. J. Spiers: Deformation of polycrystalline salt in compression and in shear at 250–350°C / Geological Society, London, Special Publications, 54:201-213, doi:10.1144/GSL.SP.1990.054.01.20 --- C. J. Spiers, P. M. T. M. Schutjens, R. H. Brzesowsky, C. J. Peach, J. L. Liezenberg, and H. J. Zwart: Experimental determination of constitutive parameters governing creep of rocksalt by pressure solution / Geological Society, London, Special Publications, 54:215-227, doi:10.1144/GSL.SP.1990.054.01.21 --- Jane A. Gilotti and Joseph M. Hull: Phenomenological superplasticity in rocks / Geological Society, London, Special Publications, 54:229-240, doi:10.1144/GSL.SP.1990.054.01.22 --- Martin Burkhard: Ductile deformation mechanisms in micritic limestones naturally deformed at low temperatures (150–350°C) / Geological Society, London, Special Publications, 54:241-257, doi:10.1144/GSL.SP.1990.054.01.23 --- A. N. Walker, E. H. Rutter, and K. H. Brodie: Experimental study of grain-size sensitive flow of synthetic, hot-pressed calcite rocks / Geological Society, London, Special Publications, 54:259-284, doi:10.1144/GSL.SP.1990.054.01.24 --- J. H. P. De Bresser and C. J. Spiers: High-temperature deformation of calcite single crystals by r+ and f+ slip / Geological Society, London, Special Publications, 54:285-298, doi:10.1144/GSL.SP.1990.054.01.25 --- M. S. Paterson and F. C. Luan: Quartzite rheology under geological conditions / Geological Society, London, Special Publications, 54:299-307, doi:10.1144/GSL.SP.1990.054.01.26 --- David J. Prior, Robert J. Knipe, and Mark R. Handy: Estimates of the rates of microstructural changes in mylonites / Geological Society, London, Special Publications, 54:309-319, doi:10.1144/GSL.SP.1990.054.01.27 --- Werner Skrotzki: Microstructure in hornblende of a mylonitic amphibolite / Geological Society, London, Special Publications, 54:321-325, doi:10.1144/GSL.SP.1990.054.01.28 --- Joseph Clancy White: Albite deformation within a basal ophiolite shear zone / Geological Society, London, Special Publications, 54:327-333, doi:10.1144/GSL.SP.1990.054.01.29 --- Rock Fabrics --- R.D. Law: Crystallographic fabrics: a selective review of their applications to research in structural geology / Geological Society, London, Special Publications, 54:335-352, doi:10.1144/GSL.SP.1990.054.01.30 --- M. W. Jessell and G. S. Lister: A simulation of the temperature dependence of quartz fabrics / Geological Society, London, Special Publications, 54:353-362, doi:10.1144/GSL.SP.1990.054.01.31 --- Jin-Han Ree: High temperature deformation of octachloropropane: dynamic grain growth and lattice reorientation / Geological Society, London, Special Publications, 54:363-368, doi:10.1144/GSL.SP.1990.054.01.32 --- Niels Ø. Olesen and Niels-Henrik Schmidt: The SEM/ECP technique applied on twinned quartz crystals / Geological Society, London, Special Publications, 54:369-373, doi:10.1144/GSL.SP.1990.054.01.33 --- H. Schaeben, H. Siemes, S. Höfler, and G. Will: Practical application of entropy optimization in quantitative texture analysis / Geological Society, London, Special Publications, 54:375-381, doi:10.1144/GSL.SP.1990.054.01.34 --- Deformation of Weak Sediments --- Daniel E. Karig: Experimental and observational constraints on the mechanical behaviour in the toes of accretionary prisms / Geological Society, London, Special Publications, 54:383-398, doi:10.1144/GSL.SP.1990.054.01.35 --- N. A. Yassir: The undrained shear behaviour of fine-grained sediments / Geological Society, London, Special Publications, 54:399-404, doi:10.1144/GSL.SP.1990.054.01.36 --- P.A.R. Nell: Deformation in an accretionary melange, Alexander Island, Antarctica / Geological Society, London, Special Publications, 54:405-416, doi:10.1144/GSL.SP.1990.054.01.37 --- Kevin T. Pickering, Susan M. Agar, and David J. Prior: Vein structur
    Location: Reading room
    Location: Reading room
    Location: Upper compact magazine
    Branch Library: GFZ Library
    Branch Library: GFZ Library
    Branch Library: GFZ Library
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  • 2
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    Faulting, Fault Sealing and Fluid Flow in Hydrocarbon Reservoirs (1998)
    London : The Geological Society
    Details
    Keywords: Hydrodynamik ; Kohlenwasserstofflagerstätte ; Störung (Geologie) ; Failles (Géologie) ; Failles (géologie) ; Faults (Geology) ; Fluid dynamics ; Huiles minérales - Fluides, Mécanique des ; Hydrocarbon reservoirs ; Mineral oils - Fluid dynamics ; Pétrole - Géologie
    Description / Table of Contents: R. J. Knipe, G. Jones, and Q. J. Fisher: Faulting, fault sealing and fluid flow in hydrocarbon reservoirs: an introduction / Geological Society, London, Special Publications, 147:vii-xxi, doi:10.1144/GSL.SP.1998.147.01.01 --- Fault Array Mapping, Geometry and Evolution --- C. Townsend, I. R. Firth, R. Westerman, L. Kirkevollen, M. Hårde, and T. Andersen: Small seismic-scale fault identification and mapping / Geological Society, London, Special Publications, 147:1-25, doi:10.1144/GSL.SP.1998.147.01.02 --- Ø. Steen, E. Sverdrup, and T. H. Hanssen: Predicting the distribution of small faults in a hydrocarbon reservoir by combining outcrop, seismic and well data / Geological Society, London, Special Publications, 147:27-50, doi:10.1144/GSL.SP.1998.147.01.03 --- D. Marchal, M. Guiraud, T. Rives, and J. van den Driessche: Space and time propagation processes of normal faults / Geological Society, London, Special Publications, 147:51-70, doi:10.1144/GSL.SP.1998.147.01.04 --- Faulting Processes and Fault Seal Characterization --- J. T. Adams and C. Dart: The appearance of potential sealing faults on borehole images / Geological Society, London, Special Publications, 147:71-86, doi:10.1144/GSL.SP.1998.147.01.05 --- K. A. Foxford, J. J. Walsh, J. Watterson, I. R. Garden, S. C. Guscott, and S. D. Burley: Structure and content of the Moab Fault Zone, Utah, USA, and its implications for fault seal prediction / Geological Society, London, Special Publications, 147:87-103, doi:10.1144/GSL.SP.1998.147.01.06 --- D. C. P. Peacock, Q. J. Fisher, E. J. M. Willemse, and A. Aydin: The relationship between faults and pressure solution seams in carbonate rocks and the implications for fluid flow / Geological Society, London, Special Publications, 147:105-115, doi:10.1144/GSL.SP.1998.147.01.07 --- Q. J. Fisher and R. J. Knipe: Fault sealing processes in siliciclastic sediments / Geological Society, London, Special Publications, 147:117-134, doi:10.1144/GSL.SP.1998.147.01.08 --- B. M. Krooss, S. Schloemer, and R. Ehrlich: Experimental investigation of molecular transport and fluid flow in unfaulted and faulted pelitic rocks / Geological Society, London, Special Publications, 147:135-146, doi:10.1144/GSL.SP.1998.147.01.09 --- D. R. Faulkner and E. H. Rutter: The gas permeability of clay-bearing fault gouge at 20°C / Geological Society, London, Special Publications, 147:147-156, doi:10.1144/GSL.SP.1998.147.01.10 --- Experimental and Numerical Modelling of Deformation and Fluid Flow --- S. K. Matthäi, A. Aydin, D. D. Pollard, and S. G. Roberts: Numerical simulation of departures from radial drawdown in a faulted sandstone reservoir with joints and deformation bands / Geological Society, London, Special Publications, 147:157-191, doi:10.1144/GSL.SP.1998.147.01.11 --- P. S. D’Onfro, W. D. Rizer, J. H. Queen, E. L. Majer, J. E. Peterson, T. M. Daley, D. W. Vasco, A. Datta-Gupta, and J. C. S. Long: An integrated approach for characterizing fractured reservoirs / Geological Society, London, Special Publications, 147:193-208, doi:10.1144/GSL.SP.1998.147.01.12 --- B. Maillot, P. Cowie, and D. Lague: Simulating polyphase faulting with a tensorial 3D model of fault growth / Geological Society, London, Special Publications, 147:209-216, doi:10.1144/GSL.SP.1998.147.01.13 --- C. G. Fleming, G. D. Couples, and R. S. Haszeldine: Thermal effects of fluid flow in steep fault zones / Geological Society, London, Special Publications, 147:217-229, doi:10.1144/GSL.SP.1998.147.01.14 --- J. R. Henderson: The influence of fault compaction on fault zone evolution / Geological Society, London, Special Publications, 147:231-242, doi:10.1144/GSL.SP.1998.147.01.15 --- P. C. Leary: Relating microscale rock-fluid interaction to macroscale fluid flow structure / Geological Society, London, Special Publications, 147:243-260, doi:10.1144/GSL.SP.1998.147.01.16 --- D. Lesnic, L. Elliott, D. B. Ingham, R. J. Knipe, and B. Clennell: An inverse problem to determine the piecewise homogeneous hydraulic conductivity within rocks / Geological Society, London, Special Publications, 147:261-268, doi:10.1144/GSL.SP.1998.147.01.17 --- Structure and Seal Analysis of Hydrocarbon Fields --- T. A. Knai and R. J. Knipe: The impact of faults on fluid flow in the Heidrun Field / Geological Society, London, Special Publications, 147:269-282, doi:10.1144/GSL.SP.1998.147.01.18 --- S. Ottesen Ellevset, R. J. Knipe, T. Svava Olsen, Q. J. Fisher, and G. Jones: Fault controlled communication in the Sleipner Vest Field, Norwegian Continental Shelf; detailed, quantitative input for reservoir simulation and well planning / Geological Society, London, Special Publications, 147:283-297, doi:10.1144/GSL.SP.1998.147.01.19 --- J. B. Ericsson, H. C. McKean, and R. J. Hooper: Facies and curvature controlled 3D fracture models in a Cretaceous carbonate reservoir, Arabian Gulf / Geological Society, London, Special Publications, 147:299-312, doi:10.1144/GSL.SP.1998.147.01.20
    Pages: Online-Ressource (XXI, 319 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 1862390223
    URL: http://sp.lyellcollection.org/content/147/1
    Language: English
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  • 3
    Electronic Resource
    Electronic Resource
    Hydrothermal gold mineralization in the Witwatersrand basin (1997)
    [s.l.] : Nature Publishing Group
    Nature 386 (1997), S. 820-824 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The sedimentary rocks of the 350 X 200 km Witwatersrand basin (Fig. 1) lie unconformably on a 〉3.1-Gyr-old4 granite-greenstone basement. Basement granitic magmatism continued during basin filling (3.1-2.7 Gyr ago)4. The basin fill comprises sedimentary and lesser volcanic material of the Archaean ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/386820a0
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  • 4
    Electronic Resource
    Electronic Resource
    Incipient metamorphism and deformation in the Variscides of SW Dyfed, Wales: first steps towards isotopic equilibrium (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of metamorphic geology 12 (1994), S. 0 
    Details
    ISSN: 1525-1314
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Incipient metamorphism accompanying thrusting, folding and cleavage development has been investigated in a varied sequence of Palaeozoic sediments near the Variscan front in SW Dyfed, Wales. The aim was to evaluate a critical stage in the progression from heterogeneous sediment, whose detrital phases are neither in equilibrium with one another, nor with pore fluids, through indurated sedimentary rock to metamorphic rock comprising newly formed crystals that equilibrated with one another as they grew.Quartz veins are widely developed in the area, especially in the more psammitic lithologies, while finer grained rocks became cleaved during tectonic deformation. Mineralogical constraints and fluid inclusion measurements suggest maximum temperatures around 200-310d̀ C (slightly higher in the Marloes-Musselwick Thrust Sheet than in other parts of the structural succession) at depths of the order of 6-13 km.Quartz veins yield distinctly heavier oxygen isotopic compositions than detrital quartz grains in the adjacent wall rocks, although care must be taken in interpreting the data because slivers of detrital grains may become incorporated into veins, while matrix detrital grains may incorporate veinlets or rims of newly formed quartz. It is concluded that vein quartz grew in isotopic equilibrium with a fluid phase whose isotopic composition was primarily controlled by exchange with phyllosilicates, not detrital quartz grains. Vein and matrix quartzes from the Marloes-Musselwick Thrust Sheet are distinctly lighter (δ18Oveins=+14 to +18% and δ18Omatrix=+11 to +14%) than those from other thrust sheets (δ18O =+17 to +20% and +14 to +17%, respectively).We conclude that vein quartz and phyllosilicate grains in cleavage domains probably attained equilibrium with a locally buffered pore fluid at the peak of metamorphism, but many relict grains of different chemical and isotopic composition remained elsewhere in the rock. Local fluid migration along veins and through cleavage lamellae facilitated the attainment of equilibrium, but there is little evidence for large-scale infiltration of externally derived fluids. With further metamorphism the quartz in these rocks would attain an isotopic composition intermediate between that of the heavy vein material and light detritus which coexist here.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1525-1314.1994.tb00019.x
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  • 5
    Electronic Resource
    Electronic Resource
    Microstructure and cleavage development in selected slates (1978)
    Springer
    Contributions to mineralogy and petrology 66 (1978), S. 165-174 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract A detailed microstructural study of three slates by high voltage transmission electron microscopy is reported. The slates are mineralogically similar, come from minor fold cores and exhibit differing degrees of cleavage intensity. All three slates have domains of orientated phyllosilicates (cleavage lamellae) which contain only a low percentage of quartz and carbonate. Between these lamellae are lenticular domains which contain deformed phyllosilicates and which are enriched in secondary minerals. The initiation of cleavage lamellae can be clearly observed in electron micrographs from one of the slates studied. It occurs along zones of intense deformation, viz. along kinks and microfolds, which form from initial crenulations that are difficult to detect in a petrological microscope. The important observed re-orientation mechanisms of the phyllosilicates during cleavage development in the three slates are strain induced crystallization and the growth of metamorphically stable phyllosilicates together with mechanical rotation. Microstructural evidence suggests that the cleavage lamellae once initiated can extend laterally into the lenticular domains as deformation proceeds. Interference between adjacent phyllosilicates during deformation is commonly observed and resultant extension sites are often enriched in secondary minerals. Chlorite rich pods occur in all of the slates studied and have complex microstructures consisting of both deformed and undeformed phyllosilicates. It is concluded that these pods may form after cleavage initiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00372155
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  • 6
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    Structurally complex reservoirs: an introduction (2008)
    In:  Geological Society Special Publication 292: 1-24.
    Details
    Publication Date: 2008-01-02
    Description: Structurally complex reservoirs form a distinct class of reservoir, in which fault arrays and fracture networks, in particular, exert an over-riding control on petroleum trapping and production behaviour. With modern exploration and production portfolios commonly held in geologically complex settings, there is an increasing technical challenge to find new prospects and to extract remaining hydrocarbons from these more structurally complex reservoirs. Improved analytical and modelling techniques will enhance our ability to locate connected hydrocarbon volumes and unswept sections of reservoir, and thus help optimize field development, production rates and ultimate recovery. This volume reviews our current understanding and ability to model the complex distribution and behaviour of fault and fracture networks, highlighting their fluid compartmentalizing effects and storage-transmissivity characteristics, and outlining approaches for predicting the dynamic fluid flow and geomechanical behaviour of structurally complex reservoirs. This introductory paper provides an overview of the research status on structurally complex reservoirs and aims to create a context for the collection of papers presented in this volume and, in doing so, an entry point for the reader into the subject. We have focused on the recent progress and outstanding issues in the areas of: (i) structural complexity and fault geometry; (ii) the detection and prediction of faults and fractures; (iii) the compartmentalizing effects of fault systems and complex siliciclastic reservoirs; and (iv) the critical controls that affect fractured reservoirs.
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  • 7
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    Three-dimensional upscaling of fault damage zones for reservoir simulation (2008)
    In:  Geological Society Special Publication 292: 353-374.
    Details
    Publication Date: 2008-01-02
    Description: Major faults are surrounded by damage zones of minor faults that, in siliclastic rocks, can form barriers to flow in their own right. Reservoir flow simulation, now a routine part of reservoir management, requires equivalent hydraulic parameters on the scale of the whole fault. Geological models of structurally complex reservoirs, from which flow simulator grids are generated, require information on the 3D characteristics of fault populations. Here, 3D stochastic models of fault damage zone (FDZ) architecture are generated based on fault population statistics (offset, orientation, length, thickness, spatial distribution) measured from seismic, outcrop and core data. These FDZ models provide input to a 3D discrete fault flow model (DFFM) and we consider the case when the minor faults have permeabilities (isotropic) that are several orders of magnitude lower than the host rock, and thus form partial barriers to flow. The DFFM is used to determine and characterize the impact of the parameters defining the FDZ on the predicted bulk FDZ permeability, connectivity, efficiency' as a barrier or retarder to flow, and the effective' fault rock throw to thickness relationship for the FDZ. The latter of the summary results presented provides a means for incorporating FDZs into conventional production simulation package models of structurally complex reservoirs.
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  • 8
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    Cross-fault sealing, baffling and fluid flow in 3D geological models: tools for analysis, visualization and interpretation (2010)
    In:  Geological Society Special Publication 347: 257-282.
    Details
    Publication Date: 2010-11-08
    Description: The effective computation and visualization of cross-fault sealing or flow, and parameters that infer or control that distribution, is a key step in the production of more reliable exploration and production simulation models. A better understanding of the impact of fault-related flow or baffling through visualization can lead to the development of more robust and useful geological models that better define the likely range in flow behaviour. A range of visualization tools are available, from the traditional fault plane juxtaposition map to the vector visualization of cross-fault fluid flux. Each tool has its applications and limitations. In this contribution we discuss the application of these different techniques and highlight situations where these are particularly successful. A number of existing visualization approaches will be reviewed and improvements to those techniques are shown. A series of existing property visualization techniques are critiqued, such as the imaging of shale gouge ratio (SGR) and fault transmissibility multipliers (TMs) on the fault faces, both of which are limited in their ability to act as a proxy for cross-fault fluid flux in many circumstances. Fault rock property visualizations, such as hydraulic resistance and fault transmissibility, are presented. More direct and hence more powerful indications of probable cross-fault fluid flux are also described, such as the effective cross-fault transmissibility (ECFT) and the effective cross-fault permeability (ECFP). These static proxies for cross-fault fluid flux are compared against back-calculated and visualized cross-fault fluid flux values derived from either streamline or full flow simulation data. The ECFT is shown to provide a useful and rapid indication of likely fluid flux from the static model; however, the direct imaging of cross-fault fluid flux derived from simulation results allows for a far better understanding of how the faults have contributed to the reservoir flow simulation result. Visualizations of the fault- and flow-related properties: (a) on the fault face; (b) in the grid cells adjacent to the fault face; (c) as vectors; or (d) as fault-wide summations, all provide useful insights for different parts of the reservoir evaluation workflow. This contribution highlights a series of new and efficient techniques to image and hence improve the understanding and modelling of fault sealing in both exploration and production settings.
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  • 9
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    Properties of fault damage zones in siliclastic rocks: a modelling approach (2007)
    In:  Geological Society Special Publication 249: 43-59.
    Details
    Publication Date: 2007-10-08
    Description: Major faults are surrounded by damage zones of minor faults that, in siliclastic rocks, can form barriers to flow in their own right. Reservoir flow simulation -- now a routine part of reservoir management -- requires equivalent hydraulic parameters on the scale of the whole fault, while reservoir geological models, from which flow simulator grids are generated, require information on the 3D characteristics of fault populations. Here, a stochastic model of fault damage zone architecture is generated and used to explore the impact of damage zone architecture on extrapolation from 1D (fault throw) and 2D (fault length) to 3D fault population characteristics. Sampling of the simulated damage zone models shows that clustering of faults causes deviations from simple laws relating particularly 1D samples to 3D population power-law exponents, with differences between expected and observed values of up to 0.25. The stochastic model is used to generate input for a 2D discrete fracture flow model for the case where minor (isotropic) fault permeability is four orders of magnitude lower than that of the host rock and, thus, forms partial barriers to flow. The flow model is used to explore the impact of fault damage zones on bulk fault permeability. The damage zone is shown to be around 50% efficient, i.e. a simple estimate of bulk permeability can be made using the harmonic average of fault rock and host-rock permeability weighted by thickness in 1D traverses (e.g. core, well logs), where only half the observed thickness of fault rock in the fault damage zone is assumed. Considering the contributions of the damage zone and the major slip zone, the fault damage zone is likely to make a significant contribution to the bulk permeability of the fault as a whole when the permeability of minor faults in the damage zone is similar to, or at most, one order of magnitude greater than that of the slip zone fault rocks.
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  • 10
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    Fault seal mapping - incorporating geometric and property uncertainty (2008)
    In:  Geological Society Special Publication 309: 5-38.
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    Publication Date: 2008-12-16
    Description: In this paper, we present workflows, key relationships and results of multiple stochastic fault seal analyses conducted on geocellular geological or (static) reservoir grids. Ranges of uncertainties are computed from new and published datasets for the different input relationships (e.g. throw, VShale to VClay, fault clay prediction, fault rock clay content to permeability); these are used as input into stochastic modelling processes and the impact of each is assessed. The power of stochastic modelling to focus interpretation and risking effort is reviewed. Reducing the uncertainty distributions from the published data ranges has a massive impact on the range of predicted fault seal properties. Halving the uncertainties associated with the computation of the transmissibility multiplier, for instance, reduces this range from 7 to 1-1.5 orders of magnitude of the base-case value (no uncertainty). Importantly, when combined together, the median predictions from each individual parameter do not lead to the median value for the final prediction; average relationships combined together will not therefore produce the average final prediction. This is a powerful result for two reasons: first, current geological modelling packages use global trends to define fault properties and so are likely to predict spurious results; and secondly, reducing the uncertainty on specific relationships by around 50% is an achievable goal. Locally calibrated datasets and relationships (field-specific) based on carefully characterized samples should allow for this improvement in prediction accuracy. This paper presents a review of fault seal techniques, published data and the potential pitfalls associated with the analyses.
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