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  • 1
    Call number: 9/M 07.0421(458)
    In: Geological Society special publication ; 485
    Description / Table of Contents: Geomechanics investigates the origin, magnitude and deformational consequences of stresses in the crust. In recent years awareness of geomechanical processes has been heightened by societal debates on fracking, human-induced seismicity, natural geohazards and safety issues with respect to petroleum exploration drilling, carbon sequestration and radioactive waste disposal. This volume explores the common ground linking geomechanics with inter alia economic and petroleum geology, structural geology, petrophysics, seismology, geotechnics, reservoir engineering and production technology. Geomechanics is a rapidly developing field that brings together a broad range of subsurface professionals seeking to use their expertise to solve current challenges in applied and fundamental geoscience. A rich diversity of case studies herein showcase applications of geomechanics to hydrocarbon exploration and field development, natural and artificial geohazards, reservoir stimulation, contemporary tectonics and subsurface fluid flow. These papers provide a representative snapshot of the exciting state of geomechanics and establish it firmly as a flourishing subdiscipline of geology that merits broadest exposure across the academic and corporate geosciences.
    Type of Medium: Monograph available for loan
    Pages: 298 Seiten , Illustrationen, Diagramme, Karten , 26 cm
    ISBN: 9781786203205
    Series Statement: Geological Society / special publication no. 458
    Language: English
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    Keywords: geomechanics ; geomechanical processes ; fracking ; seismicity ; natural geohazards ; petroleum exploration ; drilling ; carbon sequestration
    Description / Table of Contents: Geomechanics and geology: introduction / Jonathan P. Turner, Dave Healy, Richard R. Hillis and Michael J. Welch / Geological Society, London, Special Publications, 458, 1-5, 17 July 2017, https://doi.org/10.1144/SP458.15 --- The geology of geomechanics: petroleum geomechanical engineering in field development planning / M. A. Addis / Geological Society, London, Special Publications, 458, 7-29, 28 June 2017, https://doi.org/10.1144/SP458.7 --- In situ stress distribution and mechanical stratigraphy in the Bowen and Surat basins, Queensland, Australia / Emma Tavener, Thomas Flottmann and Sam Brooke-Barnett / Geological Society, London, Special Publications, 458, 31-47, 24 May 2017, https://doi.org/10.1144/SP458.4 --- Contemporary stress and neotectonics in the Otway Basin, southeastern Australia / David R. Tassone, Simon P. Holford, Rosalind King, Mark R. P. Tingay and Richard R. Hillis / Geological Society, London, Special Publications, 458, 49-88, 25 May 2017, https://doi.org/10.1144/SP458.10 --- State of stress in exhumed basins and implications for fluid flow: insights from the Illizi Basin, Algeria / Joseph M. English, Thomas Finkbeiner, Kara L. English and Rachida Yahia Cherif / Geological Society, London, Special Publications, 458, 89-112, 30 May 2017, https://doi.org/10.1144/SP458.6 --- Chalk reservoir of the Ockley accumulation, North Sea: in situ stresses, geology and implications for stimulation / T. J. Wynn, R. Kumar, R. Jones, K. Howell, D. Maxwell and P. Bailey / Geological Society, London, Special Publications, 458, 113-129, 30 May 2017, https://doi.org/10.1144/SP458.3 --- The edge of failure: critical stress overpressure states in different tectonic regimes / Richard H. Sibson / Geological Society, London, Special Publications, 458, 131-141, 24 May 2017, https://doi.org/10.1144/SP458.5 --- Active low-angle normal faults in the deep water Santos Basin, offshore Brazil: a geomechanical analogy between salt tectonics and crustal deformation / Marcos Fetter, Anderson Moraes and Andre Muller / Geological Society, London, Special Publications, 458, 143-154, 26 May 2017, https://doi.org/10.1144/SP458.11 --- Estimating friction in normal fault systems of the Basin and Range province and examining its geological context / Carson A. Richardson and Eric Seedorff / Geological Society, London, Special Publications, 458, 155-179, 25 May 2017, https://doi.org/10.1144/SP458.8 --- Natural CO2 sites in Italy show the importance of overburden geopressure, fractures and faults for CO2 storage performance and risk management / Jennifer J. Roberts, Mark Wilkinson, Mark Naylor, Zoe K. Shipton, Rachel A. Wood and R. Stuart Haszeldine / Geological Society, London, Special Publications, 458, 181-211, 19 June 2017, https://doi.org/10.1144/SP458.14 --- An improved procedure for pre-drill calculation of fracture pressure / Richard W. Lahann and Richard E. Swarbrick / Geological Society, London, Special Publications, 458, 213-225, 30 May 2017, https://doi.org/10.1144/SP458.13 --- Relationships between geomechanical properties and lithotypes in NW European chalks / Fanny Descamps, Ophélie Faÿ-Gomord, Sara Vandycke, Christian Schroeder, Rudy Swennen and Jean-Pierre Tshibangu / Geological Society, London, Special Publications, 458, 227-244, 25 May 2017, https://doi.org/10.1144/SP458.9 --- Mechanical constraints on kink band and thrust development in the Appalachian Plateau, USA / Paul Gillespie and Günther Kampfer / Geological Society, London, Special Publications, 458, 245-256, 12 June 2017, https://doi.org/10.1144/SP458.12 --- Opening-mode fracture systems: insights from recent fluid inclusion microthermometry studies of crack-seal fracture cements / Joseph M. English and Stephen E. Laubach / Geological Society, London, Special Publications, 458, 257-272, 24 May 2017, https://doi.org/10.1144/SP458.1 --- Geomechanical characterization of mud volcanoes using P-wave velocity datasets / Rashad Gulmammadov, Stephen Covey-Crump and Mads Huuse / Geological Society, London, Special Publications, 458, 273-292, 24 May 2017, https://doi.org/10.1144/SP458.2
    Pages: Online-Ressource (VII, 298 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 9781786203205
    Language: English
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  • 3
    Publication Date: 2008-10-08
    Description: Large tracts of the NW European continental shelf and Atlantic margin have experienced kilometre-scale exhumation during the Cenozoic, the timing and causes of which are debated. There is particular uncertainty about the exhumation history of the Irish Sea basin system, Western UK, which has been suggested to be a focal point of Cenozoic exhumation across the NW European continental shelf. Many studies have attributed the exhumation of this region to processes associated with the early Palaeogene initiation of the Iceland Plume, whilst the magnitude and causes of Neogene exhumation have attracted little attention. However, the sedimentary basins of the southern Irish Sea contain a mid-late Cenozoic sedimentary succession up to 1.5 km in thickness, the analysis of which should permit the contributions of Palaeogene and Neogene events to the Cenozoic exhumation of this region to be separated. In this paper, an analysis of the palaeothermal, mechanical and structural properties of the Cenozoic succession is presented with the aim of quantifying the timing and magnitude of Neogene exhumation, and identifying its ultimate causes. Synthesis of an extensive apatite fission-track analysis (AFTA), vitrinite reflectance (VR) and compaction (sonic velocity and density log-derived porosities) database shows that the preserved Cenozoic sediments in the southern Irish Sea were more deeply buried by up to 1.5 km of additional section prior to exhumation which began between 20 and 15 Ma. Maximum burial depths of the preserved sedimentary succession in the St George's Channel Basin were reached during mid-late Cenozoic times meaning that no evidence for early Palaeogene exhumation is preserved whereas AFTA data from the Mochras borehole (onshore NW Wales) show that early Palaeogene cooling (i.e. exhumation) at this location was not significant. Seismic reflection data indicate that compressional shortening was the principal driving mechanism for the Neogene exhumation of the southern Irish Sea. Coeval Neogene shortening and exhumation is observed in several sedimentary basins around the British Isles, including those along the UK Atlantic margin. This suggests that the forces responsible for the deformation and exhumation of the margin may also be responsible for the generation of kilometre-scale exhumation in an intraplate sedimentary basin system located 〉1000 km from the most proximal plate boundary. The results presented here show that compressional deformation has made an important contribution to the Neogene exhumation of the NW European continental shelf.
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  • 4
    Publication Date: 2008-10-08
    Description: Neogene-to-Recent deformation is widespread on and adjacent to Australia's passive' margins. Elevated historical seismic activity and relatively high levels of Neogene-to-Recent tectonic activity are recognized in the Flinders and Mount Lofty Ranges, the SE Australian Passive Margin, SW Western Australia and the North West Shelf. In all cases the orientation of palaeostresses inferred from Neogene-to-Recent structures is consistent with independent determinations of the orientation of the present-day stress field. Present-day stress orientations (and neotectonic palaeostress trends) vary across the Australian continent. Plate-scale stress modelling that incorporates the complex nature of the convergent plate boundary of the Indo-Australian Plate (with segments of continent-continent collision, continent-arc collision and subduction) indicates that present-day stress orientations in the Australian continent are consistent with a first-order control by plate-boundary forces. The consistency between the present-day, plate-boundary-sourced stress orientations and the record of deformation deduced from neotectonic structures implicates plate boundary forces in the ongoing intraplate deformation of the Australian continent. Deformation rates inferred from seismicity and neotectonics (as high as 10-16 s-1) are faster than seismic strain rates in many other stable' intraplate regions, suggestive of unusually high stress levels imposed on the Australian intraplate environment from plate boundary interactions many thousands of kilometres distant. The spatial overlap of neotectonic structures and zones of concentrated historical seismicity with ancient fault zones and/or regions of enhanced crustal heat flow indicates that patterns of active deformation in Australia are in part, governed, by prior tectonic structuring and are also related to structural and thermal weakening of continental crust. Neogene-to-Recent intraplate deformation within the Australian continent has had profound and under-recognized effects on hydrocarbon occurrence, both by amplifying some hydrocarbon-hosting structures and by inducing leakage from pre-existing traps due to fault reactivation or tilting.
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  • 5
    Publication Date: 2008-10-08
    Description: The Naylor structure in the Port Campbell Embayment, Otway Basin, South Australia is proposed as a demonstration site for the subsurface geological storage of carbon dioxide (CO2). The Naylor structure is a fault-bounded high with normal faults to the north and west to SW. Seismic interpretation shows evidence of recent fault reactivation in the Otway Basin. It is postulated that residual hydrocarbon columns (accumulated and leaked prior to present day) in the Otway Basin leaked due to fault reactivation. Thus, a critical issue in the geological storage of CO2 in the Port Campbell Embayment is the potential for the reactivation of faults bounding the Naylor structure. The propensity of faults to be reactivated is assessed by determining the in-situ stress field, the mechanical properties of the fault rock and the orientations of the existing faults. The in-situ stress field lies on the boundary of a strike-slip and reverse faulting regime in the Port Campbell Embayment. The vertical, minimum horizontal and maximum horizontal stress gradients are 21 MPa km-1, 19 MPa km-1 and 38 MPa km-1 respectively and the pore pressure gradient is hydrostatic. The maximum horizontal stress in the Port Campbell Embayment is oriented at 150{degrees}N. One planar and two curviplanar faults were identified within the Naylor structure. Two fault segments act to trap accumulations at the crest of the structure. These fault segments have relatively low propensities to reactivate near the crest of the structure. The intended migration pathway of the CO2 plume does not intersect the identified faults until it reaches the crest of the Naylor structure. However, reservoir heterogeneities such as sub-seismic faults may cause the migrating CO2 plume to move towards identified fault segments which are not intended to trap the injected CO2 and have a relatively high propensity to reactivate.
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  • 6
    Publication Date: 2012-08-09
    Description: Parts of the Australian continent, including the Otway Basin of the southern Australian margin, exhibit unusually high levels of neotectonic deformation for a so-called stable continental region. The onset of deformation in the Otway Basin is marked by a regional Miocene–Pliocene unconformity and inversion and exhumation of the Cretaceous–Cenozoic basin fill by up to c. 1 km. While it is generally agreed that this deformation is controlled by a mildly compressional intraplate stress field generated by the interaction of distant plate-boundary forces, it is less clear whether the present-day record of deformation manifested by seismicity is representative of the longer-term geological record of deformation. We present estimates of strain rates in the eastern Otway Basin since 10 Ma based on seismic moment release, geological observations, exhumation measurements and structural restorations. Our results demonstrate significant temporal variation in bulk crustal strain rates, from a peak of c. 2×10−16 s−1 in the Miocene–Pliocene to c. 1.09×10−17 s−1 at the present day, and indicate that the observed exhumation can be accounted for solely by crustal shortening. The Miocene–Pliocene peak in tectonic activity, along with the orthogonal alignment of inverted post-Miocene structures to measured and predicted maximum horizontal stress orientations, validates the notion that plate-boundary forces are capable of generating mild but appreciable deformation and uplift within continental interiors.
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  • 7
    Publication Date: 2003-01-01
    Description: Shale dykes, diapirs and mud volcanoes are common in the onshore and offshore regions of Brunei Darussalam. Outcrop examples show that shale has intruded along both faults and tensile fractures. Conventional models of overpressure-induced brittle failure assume that pore pressure and total stresses are independent of one another. However, data worldwide and from Brunei show that changes in pore pressure are coupled with changes in total minimum horizontal stress. The pore pressure/stress-coupling ratio ({Delta}{sigma}h/{Delta}Pp) describes the rate of change of minimum horizontal stress magnitude with changing pore pressure. Minimum horizontal stress measurements for a major offshore field where undepleted pore pressures range from normal to highly overpressured show a pore pressure/stress-coupling ratio of 0.59. As a consequence of pore pressure/stress coupling, rocks can sustain a greater increase in pore pressure prior to failure than predicted by the prevailing values of pore pressure and stress. Pore pressure/stress-coupling may favour the formation of tensile fractures with increasing pore pressure rather than reactivation of pre-existing faults. Anthropogenically-induced tensile fracturing in offshore Brunei supports this hypothesis.
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  • 8
    Publication Date: 2003-01-01
    Description: Subsurface sediment mobilization (SSM) -- which includes soft sediment deformations, sand injections, shale diapirs and mud volcanoes -- is more widespread than previously thought. The ever-increasing resolution of subsurface data yielded many new observations of SSM, not only from regions obviously prone to sediment remobilization, such as an active tectonic setting or in a region with exceptionally large sediment supply, but also from tectonically quiescent areas. Until now, all the different aspects of SSM have largely been treated as separate phenomena. There is very little cross-referencing between, for example, studies of mud volcanoes and those of sand injections, although both are caused by sediment fluidization. Divisions according to sediment type, mobilization depth or triggering mechanism make little sense when trying to understand the processes of SSM. There is a gradation in mobilization processes that cause considerable overlap between categories in any classification. Hence, it is necessary to integrate our understanding of all types of SSM, regardless of scale, depth, location, grain size or triggering mechanism. In addition, polygonal faults are important in this context, as this nontectonic structural style is closely associated with sedimentary injections and may also reflect large scale mobilization. The main goal of this volume is to help develop a more integrated understanding of subsurface sediment mobilization. It contains specific case studies and a number of overview papers about the mechanisms of sediment mobilization in the subsurface (Maltman & Bolton), about polygonal faulting (Cartwright) and about shale diapirs (Morley). Other recent review papers were published about sand ... This 250-word extract was created in the absence of an abstract.
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  • 9
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    In:  Geological Society Special Publication 216: 359-368.
    Publication Date: 2003-01-01
    Description: Clastic dykes and sills witness that subsurface sediment mobilization is often controlled by the brittle failure of units sealing' overpressured and liquidized sediments. Brittle failure also imposes a limit on the buoyancy pressure that can be exerted by hydrocarbon columns. Conventional understanding of brittle failure induced by increasing pore pressure (Pp) assumes that total minimum horizontal stress ({sigma}h) is unaffected by changes in pore pressure. However, total minimum horizontal stress increases from shallow, normally pressured sequences to deeper, overpressured sequences. Data from the Canadian Scotian Shelf, the North Sea and the Australian North West Shelf demonstrate such Pp/{sigma}h coupling, with the minimum horizontal stress increasing at approximately 60-80% of the rate of pore pressure (i.e., {Delta}{sigma}h/{Delta}Pp = 0.6-0.8). Hence, a greater increase in pore pressure can be sustained prior to brittle failure of units sealing overpressured compartments than would be predicted by conventional, uncoupled failure models. Furthermore, because total vertical stress is not similarly coupled to pore pressure, differential stress ({sigma}1-{sigma}3) reduces as pore pressure increases in normal fault regime basins. Thus, the mode of rock failure can not be inferred from differential stress in the stable state and Pp/{sigma}h coupling promotes tensile over shear failure.
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  • 10
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