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Title: Role of syn-sedimentary faulting in controlling deep water depositional systems : Upper Jurassic Magnus Sandstone Member, Northern North Sea
Author: Al-Abry, Nadia Suleiman
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2002
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The Late Kimmeridgian-Early Volgian Magnus Sandstone Member (MSM), a component part of the Upper Jurassic Humber Group, has proven to be a highly prospective system in the Northern North Sea, where it forms the main reservoir in both the Magnus (BP) and Penguin-A (Shell) fields. Earlier descriptions of the system indicated that it was deposited in a submarine fan depositional environment generated from the northwest during the Late Jurassic syn-rift period with the Penguin-A field receiving sediments from the distal fan portion. More recent models favour deposition in an axial system orientated north-south, still with a northwest provenance beyond the End of the World Fault, but the entry point being narrower and to the north of Penguin-A field. This study examines the above-proposed models and investigates the role of syn-rift faulting in controlling the Magnus Sandstone Member deposition and dispersal patterns. The research utilizes a unique subsurface dataset than integrates the Magnus and Penguin-A fields. The dataset comprises excellent 3D seismic, electrical wireline logs, core and biostratigraphic data from almost 60 exploration, appraisal and production wells within the Penguin half graben and surrounding blocks. Seismic stratigraphic interpretation has been integrated with wireline electrical well log analysis, biostratigraphic control and sedimentology core descriptions to define the overall geometry of the system and the component parts, which characterise its internal architecture. Seismic interpretation of well-calibrated 3D-seismic data of the Magnus Sandstone Member demonstrates the axial trend of deposition of the system and the possibility, within the seismic resolution, of dividing the MSM into an upper and a lower succession separated by a widespread shale. Isochron maps of the two successions illustrate that the upper succession conforms to the axial trend of the MSM deposition, whereas the lower succession indicates a single sourced confined flow deposition generated from the west.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available