Seismic interpretation and mapping of the Jurassic succession in the SW part of the Faroe-Shetland Basin as part of the Jurassic stratigraphy of the Faroe-Shetland region project

Quinn, M.F.. 2018 Seismic interpretation and mapping of the Jurassic succession in the SW part of the Faroe-Shetland Basin as part of the Jurassic stratigraphy of the Faroe-Shetland region project. Edinburgh, UK, British Geological Survey, 44pp. (CR/18/036N) (Unpublished)

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Abstract/Summary

This task forms part of the Faroe-Shetland Consortium (FSC), Phase 3, Jurassic stratigraphy of the Faroe-Shetland region Project. The aim of the task was to map the extents and thickness of the Jurassic succession within an area of study located over the south-western end of the Faroe-Shetland Basin and adjacent basins. This report forms a detailed account of the seismic interpretation of the Jurassic in the study area. The area of study was defined where the majority of the core descriptions and palynology analyses were carried out. The dataset for this task comprised four 3D and five 2D seismic surveys and access to all released commercial wells in and adjacent to the study area. Other tasks within the Jurassic project, one providing new palynology analyses on selected wells, the other, detailed core descriptions and environmental interpretations, contributed useful information during the seismic interpretation. Seismic interpretation of the Top and Base Jurassic seismic reflectors was carried out over the study area. Other seismic reflectors - Base Cenozoic, Top Upper Cretaceous, Top Lower Cretaceous, Triassic and Top crystalline basement lying above or below the Jurassic succession were also interpreted where necessary to help in the interpretation of the Jurassic succession. Interpretation of the seismic reflectors was constrained by well time/ depth pairs, production of synthetic seismograms and recognition of similar characteristics within the Jurassic seismic package. Top and Base Jurassic structure maps in Two-Way-Travel-Time (TWTT) were generated, and from these an isochore of the Jurassic succession in metres was produced. Within the study area, the Jurassic is interpreted to be thin or absent over much of the Judd High and an area on and adjacent to the south-west extension of the Rona High and Flett Sub-basin; it is also thin or absent on the tops of some of the tilted fault blocks within the North Rona Basin. The majority of Jurassic successions in the North Rona, South, West and East Solan basins are of Upper Jurassic age and less than 200 m thick. However, the Jurassic reaches a maximum interpreted thickness of 1426 m within the West Solan Basin where a thick interval of Lower Jurassic sediments are preserved. Due to lack of seismic data and, where present, seismic data that has not been processed deeply enough to image any possible Jurassic, parts of the Judd Sub-basin surrounding the Westray High could not be interpreted using sufficient seismic data to produce mapped surfaces; however it is expected that Jurassic will be present at depth. In an area west of the Westray High and north of the Judd High, a Jurassic succession has been interpreted on the north-western flank of the Judd High. No wells have been drilled deeply enough to prove a Jurassic succession in this area and interpretation relies on the character of the seismic package. An untested hydrocarbon play has been proposed in this area.

Item Type:	Publication - Report
Funders/Sponsors:	British Geological Survey
Additional Information. Not used in RCUK Gateway to Research.:	This item has been internally reviewed, but not externally peer-reviewed. Report made open in June 2021.
Date made live:	09 Jul 2021 09:39 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/530657

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