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  • 1
    Monograph available for loan
    Monograph available for loan
    Subseismic-Scale Reservoir Deformation (2018)
    London : Geological Society
    Associated volumes
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    Call number: 9/M 07.0421(459)
    In: Geological Society Special Publication
    Type of Medium: Monograph available for loan
    Pages: 215 Seiten , Illustrationen
    ISBN: 9781786203212
    Series Statement: Geological Society Special Publication 459
    URL: http://sp.lyellcollection.org/content/459/1/1
    Classification:
    Geophysical Deep Sounding
    Language: English
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
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    Subseismic-Scale Reservoir Deformation (2018)
    London : The Geological Society
    Details
    Keywords: subsurface deformation ; subseismic deformation
    Description / Table of Contents: Subseismic-scale reservoir deformation: introduction / M. Ashton, S. J. Dee and O. P. Wennberg / Geological Society, London, Special Publications, 459, 1-8, 21 September 2017, https://doi.org/10.1144/SP459.11 --- Characterization of deformation in porous sandstones --- A review of deformation bands in reservoir sandstones: geometries, mechanisms and distribution / Haakon Fossen, Roger Soliva, Gregory Ballas, Barbara Trzaskos, Carolina Cavalcante and Richard A. Schultz / Geological Society, London, Special Publications, 459, 9-33, 27 April 2017, https://doi.org/10.1144/SP459.4 --- Deformation in a North Sea Jurassic trap analysed using a triaxial plane strain experiment / Erling Rykkelid and Elin Skurtveit / Geological Society, London, Special Publications, 459, 35-57, 21 April 2017, https://doi.org/10.1144/SP459.1 --- Structural and petrophysical effects of overthrusting on highly porous sandstones: the Aztec Sandstone in the Buffington window, SE Nevada, USA / Luisa F. Zuluaga, Haakon Fossen, Gregory Ballas and Atle Rotevatn / Geological Society, London, Special Publications, 459, 59-77, 27 April 2017, https://doi.org/10.1144/SP459.8 --- Novel characterization techniques --- Fault core process and clay content derived from XRF analysis: Salina Creek Fault, Utah / Alton A. Brown, Russell K. Davies and Anne Covault Treverton / Geological Society, London, Special Publications, 459, 79-100, 9 May 2017, https://doi.org/10.1144/SP459.5 --- A brief introduction to the use of X-ray computed tomography (CT) for analysis of natural deformation structures in reservoir rocks / Ole Petter Wennberg and Lars Rennan / Geological Society, London, Special Publications, 459, 101-120, 12 May 2017, https://doi.org/10.1144/SP459.10 --- Quantifying and characterizing deformation in carbonates --- Predicting transmissibilities of carbonate-hosted fault zones / E. A. H. Michie, G. Yielding and Q. J. Fisher / Geological Society, London, Special Publications, 459, 121-137, 25 May 2017, https://doi.org/10.1144/SP459.9 --- Fracture analysis of outcrop analogues to support modelling of the subseismic domain in carbonate reservoirs, south-central Pyrenees / Jon Gutmanis, Lluís Ardèvol i Oró, Davinia Díez-Canseco, Lynda Chebbihi, Abdullah Awdal and Alexander Cook / Geological Society, London, Special Publications, 459, 139-156, 12 June 2017, https://doi.org/10.1144/SP459.2 --- Activation of stylolites as conduits for overpressured fluid flow in dolomitized platform carbonates / J. D. Martín-Martín, E. Gomez-Rivas, D. Gómez-Gras, A. Travé, R. Ameneiro, D. Koehn and P. D. Bons / Geological Society, London, Special Publications, 459, 157-176, 3 May 2017, https://doi.org/10.1144/SP459.3 --- Modelling small-scale features --- Simulation of subseismic joint and fault networks using a heuristic mechanical model / Paul Gillespie, Giulio Casini, Hayley Iben and James F. O'Brien / Geological Society, London, Special Publications, 459, 177-190, 21 April 2017, https://doi.org/10.1144/SP459.6 --- Well-data-based discrete fracture and matrix modelling and flow-based upscaling of multilayer carbonate reservoir horizons / Caroline Milliotte, Sima Jonoud, Ole Petter Wennberg, Stephan K. Matthäi, Alexandra Jurkiw and Lukas Mosser / Geological Society, London, Special Publications, 459, 191-210, 3 May 2017, https://doi.org/10.1144/SP459.7
    Pages: Online-Ressource (VII, 215 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 9781786203212
    URL: http://sp.lyellcollection.org/content/459/1
    Language: English
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  • 3
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    The Khaviz Anticline: an outcrop analogue to giant fractured Asmari Formation reservoirs in SW Iran (2007)
    In:  Geological Society Special Publication 270: 23-42.
    Details
    Publication Date: 2007-10-08
    Description: The carbonate reservoirs in the Late Oligocene--Early Miocene Asmari Formation in the Dezful Embayment of SW Iran are characterized by low matrix permeability, and effective drainage is dependent on the occurrence of open fractures. Limited information on fracture orientation and fracture density is available from core and borehole image data, and high-quality/high-resolution three-dimensional seismic is often lacking in this area. Well and core data do not contain information on important fracture parameters like length distribution, crosscutting relationships, fracture density v. lithology and bed thickness. The understanding of fracture distribution and formation in the region and their effects on fluid flow has been greatly improved by the use of outcrop analogue data. Exposures of the Asmari Formation in the Khaviz Anticline are in close vicinity to the giant hydrocarbon fields. The Khaviz Anticline has a similar geometry and structural history to the major hydrocarbon fields in the area, and represents an excellent analogue for these. Two types of fracture features were observed: diffuse fracturing and fracture swarms. The diffuse fractures form networks and comprise structures grouped into four fractures sets, which are the typical for this type of anticline. Two orthogonal fracture sets are oriented parallel and perpendicular to the fold axis, and two conjugate fracture sets are oblique to the fold axis with their obtuse angle intersecting the trend of the fold axis. The fractures are typically stratabound, sub-perpendicular to bedding and commonly about the bounding stratigraphic surfaces. To a large extent the density and height of fractures in the Asmari Formation are controlled by the mechanical stratigraphy, which is controlled by the depositional environment and cycles. These outcrop data have been essential in the generation of discrete fracture network (DFN) models and the population of the fracture properties in the reservoir models.
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  • 4
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    The characteristics of open fractures in carbonate reservoirs and their impact on fluid flow: a discussion (2016)
    Geological Society of London
    Details
    Publication Date: 2016-01-28
    Description: Permeability in fractured carbonate reservoirs is very heterogeneous due to fracturing at different scales superimposed on inherent textures from deposition and diagenesis. Observations of fractures in core and outcrop indicate that flow in open fractures in carbonate rock tends to be channelled rather than through fissures. Most of the flow takes place along a few dominating channels in the fracture plane, whereas most of the fracture plane is not effective for fluid flow. The formation of flow channels is caused by a combination of mechanical and, in particular, diagenetic processes. Single extension fractures occur as partly open or vuggy fractures, and their hydraulic properties are controlled by dissolution and cementation. Single shear fractures are typically open at local steps in the fault plane controlled by shearing along irregular fracture surfaces. Fault damage zones tend to be concentrated at fault tips, intersections, pull-aparts and overlap zones that represent areas of dilation. These damage zones represent elongated features in three dimensions with a high fracture density that will result in channelled flow at reservoir scales. The effect of channelled flow should be taken into account during evaluation of fractured carbonate reservoirs and when building dynamic flow models.
    Print ISSN: 1354-0793
    Topics: Chemistry and Pharmacology , Geosciences
    Published by Geological Society of London
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  • 5
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    The characteristics of open fractures in carbonate reservoirs and their impact on fluid flow: a discussion (2016)
    Geological Society of London
    Details
    Publication Date: 2016-04-15
    Description: Permeability in fractured carbonate reservoirs is very heterogeneous due to fracturing at different scales superimposed on inherent textures from deposition and diagenesis. Observations of fractures in core and outcrop indicate that flow in open fractures in carbonate rock tends to be channelled rather than through fissures. Most of the flow takes place along a few dominating channels in the fracture plane, whereas most of the fracture plane is not effective for fluid flow. The formation of flow channels is caused by a combination of mechanical and, in particular, diagenetic processes. Single extension fractures occur as partly open or vuggy fractures, and their hydraulic properties are controlled by dissolution and cementation. Single shear fractures are typically open at local steps in the fault plane controlled by shearing along irregular fracture surfaces. Fault damage zones tend to be concentrated at fault tips, intersections, pull-aparts and overlap zones that represent areas of dilation. These damage zones represent elongated features in three dimensions with a high fracture density that will result in channelled flow at reservoir scales. The effect of channelled flow should be taken into account during evaluation of fractured carbonate reservoirs and when building dynamic flow models.
    Print ISSN: 1354-0793
    Topics: Chemistry and Pharmacology , Geosciences
    Published by Geological Society of London
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  • 6
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    The characteristics of fracture networks in the Shiranish Formation of the Bina Bawi Anticline; comparison with the Taq Taq Field, Zagros, Kurdistan, NE Iraq (2013)
    Geological Society of London
    Details
    Publication Date: 2013-05-18
    Description: The Zagros Fold and Thrust Belt of NE Iraq hosts a prolific hydrocarbon system. Reservoirs are commonly found in fractured Cretaceous carbonates (Shiranish Formation) such as in the Taq Taq Field located in the Kirkuk Embayment of the Zagros foothills. Data providing information on fractures in the Taq Taq Field are core, image logs and flowmeters from wells, and surface observations. For comparison, an outcrop study has been undertaken around the Bina Bawi Anticline (10 km from Taq Taq Field), where the same stratigraphical unit is exposed in a continuous, lenticular-shaped belt. Fracture data have been collected using scanlines on bedding surfaces in the limbs and hinge of the anticlines. Both the Bina Bawi Anticline and Taq Taq Field show a systematic relationship between fracture sets and fracture lineaments, with a dominance of NE–SW-oriented structures. This orientation is perpendicular to the major folds and parallel to the maximum horizontal in situ stress. There are three fracture populations in the Bina Bawi Anticline, classified according to their relationship with the fold axis and bedding: (i) NW–SE-striking fractures normal to bedding: (ii) NE–SW-striking fractures normal to bedding; and (iii) conjugate oblique fracture sets subnormal to bedding. Both fracture intensity and fracture terminations are controlled by the location within the anticline; the hinge zone displays the highest intensity and the most fracture-abutting terminations. Cross-cutting relationships suggest that a prefolding stage of NE–SW tensional fractures predates folding-related tensional and shear fractures. Few uplift fractures can be indicated. We propose that the former fracture set (joints) formed in a foreland setting and was controlled by the far-field stresses, whereas later fracturing occurred due to outer arc extension during flexing of the Bina Bawi and Taq Taq anticlines. Our comparative analysis of outcrop and well data underline the importance of representative analogue data for reservoir modelling and production strategies.
    Print ISSN: 1354-0793
    Topics: Chemistry and Pharmacology , Geosciences
    Published by Geological Society of London
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  • 7
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    A brief introduction to the use of X-ray computed tomography (CT) for analysis of natural deformation structures in reservoir rocks (2017)
    Geological Society (of London)
    Details
    Publication Date: 2017-05-14
    Description: X-ray computed tomography (CT) is frequently used for non-destructive imaging and analysis of internal features in rock samples. In this paper we review the method for analysis of subseismic deformation structures in reservoir rocks, and provide some examples of different types of structures. Both medical CT and high-resolution µCT have great potential for identification of small-scale deformation structures in reservoir rocks and samples from outcrop analogues. The CT imaging techniques provide 3D data that are used in combination with 2D information from core or outcrop, thin-section and scanning electron microscopy (SEM). CT and µCT are used for quantitative and qualitative analysis of individual fractures and fracture networks, and for imaging and analysis of internal heterogeneities of fault rocks and deformation bands. The benefit of CT is that 3D properties (e.g. structure size, connectivity and variation in aperture) are actually characterized in 3D, contrary to traditional 2D methods using core surface, thin-section and outcrop. Limitations and uncertainties arise from artefacts during acquisition and processing, scale of observation and resolution, and manual steps involved in the segmentation of the CT volume. Increased availability of medical CT and µCT scanners and improved resolution should in the future lead to improved description and modelling of small-scale reservoir structures.
    Print ISSN: 0305-8719
    Electronic ISSN: 2041-4927
    Topics: Geosciences
    Published by Geological Society (of London)
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  • 8
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    Well-data-based discrete fracture and matrix modelling and flow-based upscaling of multilayer carbonate reservoir horizons (2017)
    Geological Society (of London)
    Details
    Publication Date: 2017-05-05
    Description: Discrete fracture and matrix (DFM) homogenization, simultaneously capturing reservoir layers and contained fractures, is an alternative to discrete fracture network (DFN) upscaling. Here, the DFM approach was applied to a fractured carbonate reservoir. Honouring geostatistical data from well logs, near-well multilayer reservoir models were constructed and analysed. Fracture aperture variations were modelled with a new semi-analytical model including a special treatment of layer-restricted fractures. Important results concern both pre-processing of stochastically generated DFMs for finite-element meshing, and the ensemble permeability values obtained by numerical homogenization of single v. multilayer models, respectively. Upscaling by volume averaging of vertically stacked single-layer DFMs results only in a fraction of the equivalent horizontal permeability that is obtained by homogenization of the multilayer models. Inspection of the flow patterns shows that this discrepancy arises because many fractures contact each other at layer boundaries fostering cross-flow. This effect is further enhanced where fractures intersect multiple layers. Compared to earlier DFN models for this reservoir, the DFM-derived fracture and matrix ensemble permeabilities are up to four times higher, highlighting how important it is to include the rock matrix into equivalent permeability calculations.
    Print ISSN: 0305-8719
    Electronic ISSN: 2041-4927
    Topics: Geosciences
    Published by Geological Society (of London)
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  • 9
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    Subseismic-scale reservoir deformation: introduction (2017)
    Geological Society (of London)
    Details
    Publication Date: 2017-09-23
    Description: This volume examines the current best practice and new challenges in reservoir characterization and modelling of small- to subseismic-scale deformation features through case studies, experimental results and modelling. The papers in this volume include contributions on four themes related to the small-scale deformation of hydrocarbon reservoirs: the characterization of deformation in porous sandstones; novel characterization techniques; quantifying and characterizing deformation in carbonates; and modelling small-scale features. It includes eight papers from the conference Small to Subseismic-Scale Reservoir Deformation, organized by the Petroleum Group of the Geological Society and held in London from 29 to 30 October 2014, plus two additional papers. The observations in this introduction reflect the authors’ experiences and opinions, presentations at the conference and the papers within this volume.
    Print ISSN: 0305-8719
    Electronic ISSN: 2041-4927
    Topics: Geosciences
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  • 10
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    Fracture intensity vs. mechanical stratigraphy in platform top carbonates: the Aquitanian of the Asmari Formation, Khaviz Anticline, Zagros, SW Iran (2006)
    Geological Society of London
    Details
    Publication Date: 2006-08-01
    Print ISSN: 1354-0793
    Electronic ISSN: 2041-496X
    Topics: Chemistry and Pharmacology , Geosciences
    Published by Geological Society of London
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