Structures and basins of the margin from 62° to 69°N and their development

Böen, F.; Eggen, S.; Vollset, J.

doi:10.1007/978-94-009-5626-1_18

Cited by 37 publications

(15 citation statements)

References 6 publications

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“…The age of the sediments in the Vestfjord basin is uncertain. Bøen et al [1984] suggested that Vestfjord was a Paleozoic basin. Jørgensen and Navrestad [1981] considered Vestfjord to be a region of major pre-Jurassic subsidence and sedimentation.…”

Section: Permian Extensionmentioning

confidence: 99%

The Silurian to Permian history of a metamorphic core complex in Lofoten, northern Scandinavian Caledonides

2004

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The Lofoten archipelago exposes Precambrian Baltic basement and Caledonian allochthonous sequences within a 1000 km long chain of gravity and magnetic highs and structural culminations along the extended, British and Norwegian continental shelf. Previous regional geophysical studies indicate that post‐Caledonian extension and development of the northern Norwegian shelf occurred during broadly defined Carboniferous‐Permian, Cretaceous‐Jurassic, and early Tertiary events. Structures related to these events are known to young westward. We report field, structural, and 40Ar/39Ar thermochronologic data from rocks exposed in Lofoten that further define the history and style of post‐Caledonian extension. The islands of southwest Lofoten also represent the most outboard exposures of Caledonian basement in northern Norway that presumably formed the middle to deep crustal core of the orogen. Metasedimentary rocks and penetratively deformed basement in Lofoten record high‐grade Silurian‐Devonian metamorphism and top‐to‐the‐east (hereinafter tops‐east) thrusting followed by episodes of Late Devonian to Early Carboniferous, tops‐west, ductile extension which progressed into oblique left‐slip movements. The structural style and timing of Silurian contraction in this area are remarkably similar to that determined for the more forelandward areas on the mainland, ∼120 km to the east, supporting the inference that distal parts of the Baltic continental margin that were once deeply subducted are presently exposed in Lofoten. The timings of post‐Devonian structural events that affected rocks in Lofoten are partially constrained by the ages of unconformities and strata known to be preserved in graben flanking the Lofoten culmination. The radiometric age and structural data presented in this study, in combination with stratigraphic constraints, suggest a westward progression through time of extensional deformation over a protracted interval of Silurian to Permian time. The latest, Permian extension in Lofoten is largely characterized by brittle structures that formed at conditions substantially less than 300°C. Compared to the exhumation history of the southern Western Gneiss Region, the depth of Caledonian, continental (A‐type) subduction and subsequent unroofing of Lofoten are of lesser magnitude, and the present erosional level remained in the middle crust for a much longer interval of time. The Permian 40Ar/39Ar mineral ages documented in this study are the youngest such ages yet identified in Scandinavia. These ages relate to episodes of deformation and cooling in response to extensional tectonic events that occurred roughly 100 m.y. after comparable effects identified on the Caledonian mainland. Our preferred explanation for the Carboniferous‐Permian radiometric ages, structural evolution, and stratigraphic data for Lofoten is that they all developed in the context of a long‐lived Cordilleran‐style metamorphic core complex.

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Section: Permian Extensionmentioning

confidence: 99%

The Silurian to Permian history of a metamorphic core complex in Lofoten, northern Scandinavian Caledonides

2004

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“…8). The mapping shows that the maturity increases basinward towards the west side of the area due to the increase in burial depth and the high heat flow associated with Mesozoic-Tertiary volcanic activity in this area (Bukovics et al 1983;Boen et al 1984). Note also that there is a wide zone of mature source rock (defined by the 0.6 and 1.2 % Re contours) near the centre of the mapped area.…”

Section: Second Stage: Model-calibration (The 8th Licensing Round)mentioning

confidence: 86%

Comparative studies of pre- and post-drilling modelled thermal conductivity and maturity data with post-drilling results: implications for basin modelling and hydrocarbon exploration

Ho¹,

Jensen²,

Sahai³

et al. 1998

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The primary objective of this paper is to demonstrate the successful application of maturation modelling using velocity-based thermal conductivity in the whole cycle of hydrocarbon exploration (frontier, developing and mature) on the Halten Terrace, Offshore Norway. This seismic geochemical method, used as a critical technique for selecting a favourable block in the early stages of exploration in the early 80s, enabled Conoco and its partners to make the first oil discovery and the subsequent discovery of the giant Heidrun Field in the area north of the 62nd parallel.Additional data (modelled and measured) on the thermal conductivity and Ro values are now available, and provide an excellent opportunity to compare the original (pre-drilling) basin models and related modelled results of the early 80s with 1990s (post-drilling) state-of-the-art data and models. The results of the comparative study indicate that the velocity-based conductivity compares very well with measured data, particularly in an overpressured area where conventional porosity (modelled) based thermal conductivities were inadequate. The pre-drilling predicted values of heat flow, geothermal gradient and vitrinite reflectance (based on Arrhenius equation) and oil window limits also compared favourably with post-drilling measured results. Thus, the method of calculating thermal conductivity from seismic data provides a useful tool to integrate geochemistry and geophysical (seismic) data, to calibrate maturation models, and to enhance the value of geochemistry and basin modelling in hydrocarbon exploration.for basin modelling and hydrocarbon exploration.

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“…The main reservoir units are the Middle Jurassic Ile and Garn sandstone formations, which are subjected to high pressure and high temperature (HPHT) conditions. The general stratigraphic and structural development was discussed by [2,3,4,6,7,9,11,16,19,27]. The lithostratigraphic column in the region is shown in Fig 2. The stratigraphic nomenclature used in this paper is also in accordance with the terminology for the Halten Terrace area published by [6].…”

Section: Geological Settingmentioning

confidence: 99%

Forward modeling of paleo heat flow: a case study of Kristin Field, Mid-Norwegian continental shelf

Unnithan

2009

Oceans 2009-Europe

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Temperature and paleo heat flow are critical of understanding of hydrocarbon plays in the Norwegian margin. The Kristin Field located on the Mid-Norwegian continental shelf is selected to construct a 3D thermal history model. The rift evolution of the Kristin Field and corresponding paleo heat flow have been modeled with forward modeling approach in our study. Based on the simulation of crustal thinning and tectonic subsidence, the average stretching factor 1.5 for crust and 2.5 for mantle were obtained in our study area. The crustal heat flow variations at different rift phases are presented by 1D extraction from the 3D model at well locations. The heat flow trend starts from 57 mW/m2 during the pre-rifting phase, increases to 83 mW/m2 at the end of Jurassic rifting phase and decays to 53 mW/m2 as a stationary state from 24 Ma to present. The modeled heat flow values are in agreement with published data in the vicinities of Halten Terrace. In particular, our study highlighted the thermal conditions for depth level below the reach of boreholes and provided useful information in determining source rock maturation and hydrocarbon generation history in the Halten Terrace area.

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Structures and basins of the margin from 62° to 69°N and their development

Cited by 37 publications

References 6 publications

The Silurian to Permian history of a metamorphic core complex in Lofoten, northern Scandinavian Caledonides

The Silurian to Permian history of a metamorphic core complex in Lofoten, northern Scandinavian Caledonides

Comparative studies of pre- and post-drilling modelled thermal conductivity and maturity data with post-drilling results: implications for basin modelling and hydrocarbon exploration

Forward modeling of paleo heat flow: a case study of Kristin Field, Mid-Norwegian continental shelf

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