Publications
57 results found
Vandeginste V, Stehle MC, Jourdan A-L, et al., 2017, Diagenesis in salt dome roof strata: Barite - calcite assemblage in Jebel Madar, Oman, MARINE AND PETROLEUM GEOLOGY, Vol: 86, Pages: 408-425, ISSN: 0264-8172
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- Citations: 7
Wang X, Lei Q, Lonergan L, et al., 2017, Heterogeneous fluid flow in fractured layered carbonates and its implication for generation of incipient karst, Advances in Water Resources, Vol: 107, Pages: 502-516, ISSN: 1872-9657
We use numerical models to investigate fluid flow in layered fractured carbonate rocks, and specifically to investigate the effects of the structural and hydraulic properties of both joints and bedding planes on flow localization. Synthetic fracture networks made up of two jointed layers separated by a horizontal bedding plane are generated to represent the typical layered fracture systems often formed in carbonate rocks. A uniform aperture field is assumed for each joint set and for the bedding plane, but different joint sets and the bedding plane can have non-identical values. The aperture ratio of the joint sets to the bedding plane is found to dominate the behaviour of flow heterogeneity on the bedding plane. Three distinct flow regimes, i.e. joint-dominated, transitional and bedding plane-dominated, are recognized. The magnitude of the aperture ratio controls which flow regime develops. We further suggest that the different flow regimes may be responsible for the initiation of different types of incipient karst morphologies observed in nature: pipe karst, stripe karst and sheet karst.
Schieber J, Bish D, Coleman M, et al., 2016, Encounters with an unearthly mudstone: Understanding thefirst mudstone found on Mars, Sedimentology, Vol: 64, Pages: 311-358, ISSN: 1365-3091
The Sheepbed mudstone forms the base of the strata examined by the Curiosity rover in Gale Crater on Mars, and is the first bona fide mudstone known on another planet. From images and associated data, this contribution proposes a holistic interpretation of depositional regime, diagenesis and burial history. A lake basin probably received sediment pulses from alluvial fans. Bed cross-sections show millimetre to centimetre-scale layering due to distal pulses of fluvial sediment injections (fine-grained hyperpycnites), fall-out from river plumes, and some aeolian supply. Diagenetic features include mineralized synaeresis cracks and millimetre-scale nodules, as well as stratiform cementation. Clay minerals were initially considered due to in situ alteration, but bulk rock chemistry and mineralogy suggests that sediments were derived from variably weathered source rocks that probably contained pre-existing clay minerals. X-ray diffraction analyses show contrasting clay mineralogy in closely spaced samples, consistent with at least partial detrital supply of clay minerals. A significant (ca 30 wt%) amorphous component is consistent with little post-depositional alteration. Theoretical modelling of diagenetic reactions, as well as kinetic considerations, suggest that the bulk of diagenetic clay mineral formation occurred comparatively late in diagenesis. Diagenetic features (synaeresis cracks and nodules) were previously thought to reflect early diagenetic gas formation, but an alternative scenario of synaeresis crack formation via fabric collapse of flocculated clays appears more likely. The observed diagenetic features, such as solid nodules, hollow nodules, matrix cement and ‘raised ridges’ (synaeresis cracks) can be explained with progressive alteration of olivine/glass in conjunction with centrifugal and counter diffusion of reactive species. Anhydrite-filled fractures in the Sheepbed mudstone occurred late in diagenesis when fluid pressures built up to ex
Gholipour AM, Cosgrove JW, Ala M, 2016, New theoretical model for predicting and modelling fractures in folded fractured reservoirs, PETROLEUM GEOSCIENCE, Vol: 22, Pages: 257-280, ISSN: 1354-0793
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- Citations: 12
Wang X, Jardani A, Jourde H, et al., 2015, Characterisation of the transmissivity field of a fractured and karstic aquifer, Southern France, Advances in Water Resources, Vol: 87, Pages: 106-121, ISSN: 1872-9657
Geological and hydrological data collected at the Terrieu experimental site north of Montpellier, in a confined carbonate aquifer indicates that both fracture clusters and a major bedding plane form the main flow paths of this highly heterogeneous karst aquifer. However, characterising the geometry and spatial location of the main flow channels and estimating their flow properties remain difficult. These challenges can be addressed by solving an inverse problem using the available hydraulic head data recorded during a set of interference pumping tests.We first constructed a 2D equivalent porous medium model to represent the test site domain and then employed regular zoning parameterisation, on which the inverse modelling was performed. Because we aim to resolve the fine-scale characteristics of the transmissivity field, the problem undertaken is essentially a large-scale inverse model, i.e. the dimension of the unknown parameters is high. In order to deal with the high computational demands in such a large-scale inverse problem, a gradient-based, non-linear algorithm (SNOPT) was used to estimate the transmissivity field on the experimental site scale through the inversion of steady-state, hydraulic head measurements recorded at 22 boreholes during 8 sequential cross-hole pumping tests. We used the data from outcrops, borehole fracture measurements and interpretations of inter-well connectivities from interference test responses as initial models to trigger the inversion. Constraints for hydraulic conductivities, based on analytical interpretations of pumping tests, were also added to the inversion models. In addition, the efficiency of the adopted inverse algorithm enables us to increase dramatically the number of unknown parameters to investigate the influence of elementary discretisation on the reconstruction of the transmissivity fields in both synthetic and field studies.By following the above approach, transmissivity fields that produce similar hydrodynamic beh
Vandeginste V, John CM, Cosgrove JW, et al., 2014, Dimensions, texture-distribution, and geochemical heterogeneities of fracture- related dolomite geobodies hosted in Ediacaran limestones, northern Oman, AAPG BULLETIN, Vol: 98, Pages: 1789-1809, ISSN: 0149-1423
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- Citations: 13
Vandeginste V, John CM, van de Flierdt T, et al., 2013, Linking process, dimension, texture, and geochemistry in dolomite geobodies: A case study from Wadi Mistal (northern Oman), AAPG BULLETIN, Vol: 97, Pages: 1181-1207, ISSN: 0149-1423
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- Citations: 27
Carreras J, Cosgrove JW, Druguet E, 2013, Strain partitioning in banded and/or anisotropic rocks: Implications for inferring tectonic regimes, JOURNAL OF STRUCTURAL GEOLOGY, Vol: 50, Pages: 7-21, ISSN: 0191-8141
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- Citations: 40
Dahroug A, Cosgrove JW, Paluszny A, et al., 2013, The investigation of complex reservoir behavior of naturally fractured tight sands response, Pages: 1044-1048
We investigate a series of well tests (WT) in tight sand and shale, dry gas, naturally fractured reservoirs that were conducted for long durations. Surprisingly, the transient pressure analysis signature of these reservoirs is similar to the signatures from lean gas reservoirs. Our primary investigation has explored the possible causes related to, geology, and specific well conditions that could result in the ambiguous WT response. However as the WT response has been found repeatedly in a variety of regions around the world, it cannot be related to any of these. We have considered the possible impact of the scale-dependency of the properties of fracture networks on the WT response. It is argued that the anomalies in the WT response may reflect a step in the scale-dependent properties of the fracture network. It is known that in both dry and lean gas examples the anomalous response is caused by a change in permeability. In the lean gas this is caused by the condensate bank region that induces change in the permeability of the system. However, this cannot be the explanation in the dry gas example. We suggest that the response reflects the scale-dependence of the intrinsic permeability of the fracture network.
Lehtonen A, Cosgrove JW, Hudson JA, et al., 2012, An examination of in situ rock stress estimation using the Kaiser effect, ENGINEERING GEOLOGY, Vol: 124, Pages: 24-37, ISSN: 0013-7952
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- Citations: 55
Cosgrove JW, Hudson JA, 2012, The structural geology contribution to rock mechanics modelling and rock engineering design, 12th ISRM International Congress on Rock Mechanics, Publisher: CRC PRESS-TAYLOR & FRANCIS GROUP, Pages: 195-199
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- Citations: 2
Casciello E, Cosgrove JW, Cesarano M, et al., 2011, Illite-smectite patterns in sheared Pleistocene mudstones of the Southern Apennines and their implications regarding the process of illitization: A multiscale analysis, JOURNAL OF STRUCTURAL GEOLOGY, Vol: 33, Pages: 1699-1711, ISSN: 0191-8141
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- Citations: 12
Burberry CM, Jackson CA-L, Cosgrove JC, 2011, Late Cretaceous to Recent deformation related to inherited structures and subsequent compression within the Persian Gulf: a 2D seismic case study, Journal of the Geological Society, Vol: 168, Pages: 485-498
The Persian Gulf is part of an asymmetric foreland basin related to the Zagros Orogen. Few published studies of this basin and associated onshore areas include seismic reflection data. We present a seismic-stratigraphic interpretation based on marine 2D seismic data, which reveals the presence of two types of compressional structures within the basin: (1) faulted domes related to salt movement and the offshore trace of a NNE–SSW-trending dextral basement fault (the Kazerun Fault); (2) long-wavelength (16 km), low-amplitude (60 ms two-way travel time) folds relating to the advancing deformation front associated with the orogen. Thinning of age-constrained stratal units across structures related to the offshore trace of the Kazerun Fault implies a distinct pulse of uplift on this fault during the Maastrichtian. The geometry of growth strata across other intra-basin structures suggests a second, later stage of deformation, which began in the Middle Miocene. Thickening and folding of post-Middle Miocene stratal units towards the NE (i.e. towards the Zagros Orogen) is interpreted to reflect rapid loading, subsidence and compression related to southwestwards advance of the orogen. The results of this study have implications for the interaction between pre-existing structures and later compressional events both within the Persian Gulf and elsewhere.
Hudson JA, Cosgrove JW, Kemppainen K, et al., 2011, Faults in crystalline rock and the estimation of their mechanical properties at the Olkiluoto site, western Finland, ENGINEERING GEOLOGY, Vol: 117, Pages: 246-258, ISSN: 0013-7952
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- Citations: 24
Turner SA, Liu JG, Cosgrove JW, 2011, Structural evolution of the Piqiang Fault Zone, NW Tarim Basin, China, JOURNAL OF ASIAN EARTH SCIENCES, Vol: 40, Pages: 394-402, ISSN: 1367-9120
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- Citations: 18
Cosgrove JW, Talbot CJ, Aftabi P, 2009, A train of kink folds in the surficial salt of Qom Kuh, Central Iran, JOURNAL OF STRUCTURAL GEOLOGY, Vol: 31, Pages: 1212-1222, ISSN: 0191-8141
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- Citations: 4
Belayneh M, Cosgrove JW, 2009, Hybrid veins from the southern margin of the Bristol Channel Basin, Journal of Structural Geology
Burberry CM, Cosgrove JW, Liu JG, 2008, Spatial arrangement of fold types in the Zagros Simply Folded Belt, Iran, indicated by landform morphology and drainage pattern characteristics, JOURNAL OF MAPS, Vol: 4, Pages: 417-430, ISSN: 1744-5647
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- Citations: 23
Belayneh M, Matthai SK, Cosgrove JW, 2007, The implications of fracture swarms in the Chalk of SE England on the tectonic history of the basin and their impact on fluid flow in high-porosity, low permeability rocks, Geological Society, London, Special Publications, Vol: 272, Pages: 501-519
Cosgrove JW, 2007, The use of shear zones and related structures as kinematic indicators: a review., Geological Society, London, Special Publications, Vol: 272, Pages: 61-76
Sepehr M, Cosgrove JW, 2007, The role of major fault zones in controlling the geometry and spatial organization of structures within the Zagros Fold-Thrust Belt, Geological Society, London, Special Publications, Vol: 272, Pages: 419-436
Hunt GW, Edmunds R, Budd CJ, et al., 2006, Serial parallel folding with friction: a primitive model using cubic B-splines, JOURNAL OF STRUCTURAL GEOLOGY, Vol: 28, Pages: 444-455, ISSN: 0191-8141
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- Citations: 11
Sepehr M, Cosgrove JW, Moieni M, 2006, The impact of cover rock rheology on the style of folding in the Zagros fold-thrust belt, Tectonophysics, Vol: 427, Pages: 265-281
Baratoux L, Lexa O, Cosgrove JW, et al., 2005, The quantitative link between fold geometry, mineral fabric and mechanical anisotropy: as exemplified by the deformation of amphibolites across a regional metamorphic gradient, JOURNAL OF STRUCTURAL GEOLOGY, Vol: 27, Pages: 707-730, ISSN: 0191-8141
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- Citations: 10
Sepehr M, Cosgrove JW, 2005, Role of the Kazerun Fault Zone in the formation and deformation of the Zagros Fold-Thrust Belt, Iran, Tectonics, Vol: 24, Pages: TC5005-1-TC5005-13, ISSN: 0278-7407
Liu JG, Haselwimmer C, Cosgrove JW, 2005, Ruptures found up to 60km south of the major fault zone after 14 Nov 2001 Kunlun earthquake using Landsat-7 ETM+ imagery, New York, 25th ieee international geoscience and remote sensing symposium (igarss 2005), 25 - 29 July 2005, Seoul, SOUTH KOREA, Publisher: Ieee, Pages: 5261-5264
Sepehr M, Cosgrove JW, 2004, Structural framework of the Zagros Fold-Thrust Belt, Iran, MARINE AND PETROLEUM GEOLOGY, Vol: 21, Pages: 829-843, ISSN: 0264-8172
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- Citations: 377
Cosgrove JW, Engelder T, 2004, The initiation, propagation and arrest of joints and other fractures, Geological Society, London, Special Publications, Vol: 231
Belayneh M, Cosgrove JW, 2004, Fracture pattern variations around a major foldand their implications regarding fracture prediction using limited data: an examplefrom the Bristol Channel Basin., The geological Society of london special Publication, Vol: 231, Pages: 74-89
Belayneh M, Cosgrove JW, 2004, Fracture-pattern variations around a major fold and their implications regarding fracture prediction using limited data: an example from the Bristol Channel Basin, London, The initiation, propagation and arrest of joints and other fractures, Publisher: The Geological Society, Pages: 89-102
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