Alvar Braathen

Alvar Braathen
University of Oslo · Department of Geosciences

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214
Publications
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Publications

Publications (214)
Article
Full-text available
Faults play an essential role at many potential CO 2 storage sites because they can act as conduits or barriers to fluid flow. To contribute to the evaluation of the Aurora storage site in the northern North Sea, we perform a structural characterization and assessment of across-fault seals that displace the Lower Jurassic storage complex. We find t...
Presentation
The Utsira High (North Sea) records rift faulting that culminates with Jurassic-Cretaceous crustal-scale rollover towards the Viking Graben. This deformation is superimposed on Paleozoic fault-bounded basins on a substrate of Caledonian nappes. The latter contains multilevel crustal-scale shear systems that domed under the Utsira High during the De...
Article
Understanding carbon dioxide (CO2) reservoir to surface migration is crucial to successful carbon capture and sequestration approaches; especially fault/reservoir interactions under injection pressure. Through seismic imaging, we explore regolith and shallow stratigraphy across the Little Grand Wash fault. The presence of natural CO2 seeps, travert...
Article
Seismic resolution and illumination issues are sources of challenges in the detailed imaging and detection of subsurface fault architecture and fluid migration. Improved constraints on resolution can provide input into monitoring requirements and detectability of CO2 leakage, and fault-sealing properties during subsurface visualization of migration...
Article
Full-text available
The Svalbard Composite Tectono-Stratigraphic Element is located on the north-western corner of the Barents Shelf and comprises a Carboniferous to Pleistocene sedimentary succession. Due to Cenozoic uplift the succession is subaerially exposed in the Svalbard archipelago. The oldest parts of the succession consist of Carboniferous to Permian mixed s...
Article
Full-text available
The Utsira High (North Sea) records rift faulting that culminates with Jurassic-Cretaceous crustal-scale rollover towards the Viking Graben. This deformation is superimposed on Paleozoic fault-bounded basins on a substrate of Caledonian nappes. The latter contains multilevel crustal-scale shear systems that domed under the Utsira High during the De...
Presentation
Suprabasins workshop objectives 1. Place the prolific Utsira, Frøya and Loppa-region highs of the Norwegian Continental Shelf into a detailed temporal tectonostratigraphic framework. 2. Connect the Utsira, Loppa and Frøya analyses with case studies of analogue basins, to develop new conceptual learning of significant innovative nature. 3. Develop m...
Chapter
New analytical and field techniques, as well as increased international communication and collaboration, have resulted in significant new geological discoveries within the Appalachian-Caledonian-Variscan orogen. Cross-Atlantic correlations are more tightly constrained and the database that helps us understand the origins of Gondwanan terranes conti...
Preprint
Full-text available
The Utsira High (North Sea) records rift faulting that culminates with Jurassic-Cretaceous crustal-scale rollover towards the Viking Graben. This deformation is superimposed on Paleozoic fault-bounded basins on a substrate of Caledonian nappes. The latter contains multilevel crustal-scale shear systems that domed under the Utsira High during the De...
Preprint
The maturation of geological CCS along the Norwegian Continental Shelf is ongoing in the Norwegian North Sea, however, more storage sites are needed to reach climate mitigation goals by 2050. In order to augment the Aurora site and expand CO2 storage in the northern Horda Platform, regional traps and seals must be assessed to better understand the...
Article
Full-text available
Generating an accurate model of the subsurface for the purpose of assessing the feasibility of a CO2 storage site is crucial. In particular, how faults are interpreted is likely to influence the predicted capacity and integrity of the reservoir; whether this is through identifying high risk areas along the fault, where fluid is likely to flow acros...
Article
Full-text available
Late to post‐Caledonian, Devonian extension remains unresolved in the SW Barents Sea despite considerable knowledge from onshore Norway, East Greenland and Svalbard. We analyze intrabasement seismic facies in high‐resolution 3D and reprocessed 2D data to investigate evidence for Caledonian deformation and post‐Caledonian detachment faulting in the...
Article
Full-text available
Seismic mapping of subsurface faults is hampered by factors such as seismic resolution, velocity control for depth conversion and human bias. Here, we explore the challenges and pitfalls related to interpreting normal faults by comparing objective and subjective uncertainties. A panel of 20 interpreters, with different geoscientific backgrounds, in...
Article
Full-text available
p>Significant uncertainties occur through varying methodologies when interpreting faults using seismic data. These uncertainties are carried through to the interpretation of how faults may act as baffles or barriers, or increase fluid flow. How fault segments are picked when interpreting structures, i.e. which seismic line orientation, bin spacing...
Article
Fault‐controlled mixed siliciclastic‐carbonate‐evaporite depositional systems exhibit distinct sensitivity to tectonic and eustatic controls that are expressed in the sedimentary architecture. In the Upper Carboniferous Billefjorden Trough (Svalbard, Norway), up to 2000 m of a warm and arid climate syn‐rift basin fill comprises such depositional sy...
Preprint
Full-text available
Significant uncertainties occur through varying methodologies when interpreting faults using seismic data. These uncertainties are carried through to the interpretation of how faults may act as baffles/barriers or increase fluid flow. How fault segments are picked when interpreting structures, i.e. what seismic line spacing is specified, as well as...
Conference Paper
The presence of Upper Jurassic through Lower Paleogene sealing units in the Horda Platform has been assessed and established for the purpose of derisking the Alpha CO2 storage prospect in the Smeaheia fault block. The nearby Troll East field closure provides as an excellent analogue for evaluating seals surrounding the Alpha closure. Analysis of ma...
Article
The underexplored Barents shelf petroleum province is a globally unique example where naturally occurring underpressure is observed offshore and onshore. In the offshore parts of the northern Barents shelf, minor underpressure (up to 23 bar below hydrostatic pressure) is observed in the fault-bounded Mesozoic reservoirs of the Fingerdjupet subbasin...
Article
Full-text available
Folds in porous sandstone in cases allow identification of progressive deformation in an evolving strain field. In the Navajo Sandstone of the km-scale Laramide-style monocline of the San Rafael Swell (Utah, USA), four populations of small-scale structures record different kinematics and deformation mechanisms, depending on orientation to bedding w...
Article
Full-text available
Fracture stiffness and flow properties have been measured in the laboratory using naturally fractured fault rock samples from the Little Grand Wash fault, Utah, USA. We compare fracture closure and related flow change during isotropic loading of two fractures which have been subject to various amounts of paleoreactive flow. The two tested fractures...
Article
Smeaheia, a prominent fault block located on the Horda Platform, northern North Sea is identified as a potential subsurface CO2 storage site. We utilize the GN1101 3D seismic survey to generate a high-resolution subsurface geomodel to inform the structural style and evolution of the fault block, to investigate geological controls on proposed CO2 st...
Article
Full-text available
A transition from supradetachment to rift basin signature is recorded in the ~1500 m thick succession of continental to shallow marine conglomerates, mixed carbonate‐siliciclastic shallow marine sediments and carbonate ramp deposits preserved in the Bandar Jissah Basin, located southeast of Muscat in the Sultanate of Oman. During deposition, isosta...
Article
Full-text available
The study describes the depositional development and sediment partitioning in a prograding paralic Triassic succession. The deposits are associated with the advance of large prism‐scale clinoforms across a shallower platform area. Approaching the platform, the limited accommodation and associated relative higher rates of deposition generated straig...
Article
Full-text available
Cooling fracture orientations in diabase sills associated with the Cretaceous High Arctic Large Igneous Province and syn‐sedimentary Triassic faults help constrain a model for Svalbard's (NE Barents Shelf) Mesozoic stress field evolution. Fracture data from Edgeøya and adjacent islands in SE Svalbard, from S Spitsbergen, and from literature were us...
Article
Full-text available
Thermogenic dry gas flowed from Jurassic sections in the DH5R research well drilled onshore in Adventdalen, central Spitsbergen, Arctic Norway. The DH5R gas originates from the organic-rich units of the mudstone-dominated Middle Jurassic to Lower Cretaceous Agardhfjellet Formation, which is the onshore equivalent to the Fuglen Formation and the pro...
Article
The data associated with the above manuscript along with a brief description is archived as the excel and pdf files listed, linked and described below.
Article
Full-text available
From 2007 to 2015, eight wells were drilled and fully cored to test the feasibility of storing CO2 emitted from the coal-fueled power plant in Longyearbyen, Svalbard. The drilling campaign identified three water-bearing sandstone aquifers; i) a lower aquifer in Upper Triassic strata; ii) a middle aquifer in Upper Triassic to Middle Jurassic; and ii...
Article
Full-text available
Thermogenic dry gas flowed from Jurassic sections in the DH5R research well drilled onshore in Adventdalen, central Spitsbergen, Arctic Norway. The DH5R gas originates from the organic-rich units of the mudstone-dominated Middle Jurassic to Lower Cretaceous Agardhfjellet Formation, which is the onshore equivalent to the Fuglen Formation and the pro...
Article
Significant post-orogenic extension of the renowned Semail Ophiolite and substrata in Oman resulted in the formation of metamorphic core complexes juxtaposed with an array of Maastrichtian-Paleogene extensional basins. During this evolution, basins became progressively localized. The geometry of the large-scale and long-lived extensional system cha...
Presentation
Full-text available
NCCS Task 9 - Structural derisking
Article
The Listafjord–Drangedal Fault Complex is a central structure in the NE-SW-trending Agder–Telemark Lineament Zone that dominates the structural grain and topography of southernmost tip of Norway. The fault can be followed for a distance of more than 170 km from the shelf area off Listafjorden–Fedafjorden in Vest Agder county to Drangedal in Telemar...
Article
Full-text available
World‐class examples of fault‐controlled growth basins with associated syn‐kinematic sedimentary fill are developed in Upper Triassic prodelta to delta‐front deposits exposed at Kvalpynten, SW Edgeøya in East Svalbard. They are interpreted to have interacted with north‐westerly progradation of a regional delta system. The syn‐kinematic successions...
Article
Unconformities, by definition, correspond to erosional or nondepositional surfaces, which separate older strata below, from younger rocks above, encapsulating significant time gaps. However, recent studies have highlighted the composite nature of some unconformities, as well as their heterochronous and diachronous character, which challenge the use...
Poster
Full-text available
Abstract: Smeaheia, a potential subsurface storage unit situated in the northern North Sea, east of Troll East was previously considered as the most suitable location for storage of CO2 for a proposed full-chain CCS project in Norway. The site was preferable owing to the adjacency to existing pipe-line infrastructure, a lack of potential for interf...
Article
Full-text available
Modern, tide‐dominated and tide‐influenced coastlines are characterised by a range of environments, including deltas, estuaries, and lagoons. However, some tide‐dominated basins and related sedimentary units in the rock record, such as the semi‐enclosed, shallow, Utah‐Idaho Trough foreland basin of the Jurassic Curtis sea, do not correspond to any...
Presentation
Abstract: Temperature plays a crucial role in the spatial and temporal distribution of diagenetic alterations and maturity of source rocks in sedimentary basins. Therefore, constraining the thermal history of sediments in a sedimentary basin is fundamental in forecasting porosity, permeability, and maturity of source rocks, which represent common u...
Article
Extensional faults and folds exert a fundamental control on the location, thickness and partitioning of sedimentary deposits in rift basins. The connection between the mode of extensional fault reactivation, resulting fault shape and extensional fold growth is well established. The impact of folding on accommodation evolution and growth package arc...
Conference Paper
Full-text available
Complexity in fault shape, fault displacement pattern and deformation of host rocks is inherent in any multi-stage rift basin. Different styles of fault growth and reactivation during successive rift phases yield non-planar fault geometries that lead to folding of host rocks upon further fault displacement. Fault-related folding modifies accommodat...
Article
Analysis of the sedimentary architecture of the early Billefjorden Trough, an exceptionally well-exposed Carboniferous half-graben located in Svalbard, Arctic Norway, allows detailed reconstruction of fault development and basin geometry. Sedimentary facies distribution reveals facies variability in an early synrift fill, when an array of meso-scal...
Article
Full-text available
The Upper Triassic to Middle Jurassic Wilhelmøya Subgroup forms one of the more suitable reservoir units on the Norwegian Arctic archipelago of Svalbard. The target siliciclastic storage unit, which is encountered at approx. 670 m depth at the potential injection site in Adventdalen, central Spitsbergen, is a severely under-pressured (at least 35 b...
Conference Paper
Full-text available
Unconformities matter: The spatial and temporal information contained in the J-3 Unconformity and the Curtis Formation, east-central Utah, USA. A spatio-temporal re-interpretation of a regionally significant unconformity is proposed to refine the depositional history of its basin, highlighting the fact that unconformities are dynamic sedimentary...
Article
Full-text available
Based on a methodic sedimentological analysis, the Late Jurassic (Oxfordian) Curtis Formation unravels the intricate facies variability which occurs in a tide-dominated, fluvially starved, low-gradient, semi-enclosed epicontinental basin. This unit crops out in east-central Utah, between the eolian deposits of the underlying Middle Jurassic (Callov...
Article
Full-text available
Based on a methodic sedimentological analysis, the Late Jurassic (Oxfordian) Curtis Formation unravels the intricate facies variability which occurs in a tide-dominated, fluvially starved, low-gradient, semi-enclosed epicontinental basin. This unit crops out in east-central Utah, between the eolian deposits of the underlying Middle Jurassic (Callov...
Article
Full-text available
The Late Triassic outcrops on southern Edgeøya, East Svalbard, allow a multi‐scale study of syn‐sedimentary listric growth faults located in the pro‐delta region of a regional prograding system. At least three hierarchical orders of growth faults have been recognized, each showing different deformation mechanisms, styles and stratigraphic locations...
Article
In this study we synthesise sedimentological, fault, and Amplitude Versus Angle (AVA) analysis and propose that the Fruholmen and Tubåen formations (Realgrunnen Subgroup) are syn-kinematic deposits that record a previously undocumented early phase of Mesozoic rifting on the Troms-Finnmark fault Complex and within the Hammerfest Basin. The Realgrunn...
Article
Temperature impacts the quality of reservoir and source rocks, thereby representing an important aspect of petroleum prospect assessments of any basin. This case study of the Triassic basin of Edgeøya, eastern Svalbard, reevaluate earlier burial estimates that were solely based on organic matter maturation data from organic rich shales. Here we est...
Article
Sedimentary basins containing igneous intrusions within sedimentary reservoir units represent an important risk in petroleum exploration. The Upper Triassic to Lower Jurassic sediments at Wilhelmøya (Svalbard) contains reservoir heterogeneity as a result of sill emplacement and represent a unique case study to better understand the effect of magmat...
Article
In their comment, Dallmann & Piepjohn (2018, this volume) raise some questions regarding the existence and age of the large‐magnitude extensional detachment described by us from Northern Spitsbergen and the significance of our observations and interpretations as compared to previously published models of thrusting and strike‐slip. In their view, ou...
Technical Report
Full-text available
Geological carbon capture and storage (CCS) is an emerging technology that has been designed to mitigate the impact of human activities on global warming. In order to achieve public acceptance of this technology, one needs to guarantee its safety for the environment and the population. Potential leakage of CO2 from underground storage sites is one...
Conference Paper
Full-text available
The study combines facies analysis from sedimentary logs with large-scale pseudo 3D photogrammetric observations to provide a large-scale regional understanding of the Carnian depositional development of the area around SW Edgeøya, which was filled by strongly tidally influenced deltaic systems. The studied succession documents an early lowstand du...
Article
Investigations of syn-sedimentary growth faults in the Last Chance delta (Ferron Sandstone, Utah, USA) show that fault-bounded half-grabens arrested high amounts of sand in the mouth bar and/or distributary channel areas. Fault-controlled morphology causes changes in routing of the delta top to delta front drainage towards the long axis of half-gra...
Conference Paper
The Triassic outcrops on the island of Edgeøya document a complex depositional history reflecting infill by large-scale NW prograding shelf-prism scale deltaic systems which advanced across the Barents Shelf. This study combines facies analysis from sedimentary logs with large-scale pseudo 3D photogrammetric observations to provide a large-scale re...