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all geography including DSDP/ODP Sites and Legs
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Porcupine Basin
Conjugate margins — An oversimplification of the complex southern North Atlantic rift and spreading system?
A review of producing fields inferred to have upslope stratigraphically trapped turbidite reservoirs: Trapping styles (pure and combined), pinch-out formation, and depositional setting
Old challenges, new developments and new plays in Irish offshore exploration
Abstract More than 46 years of exploration in the Irish offshore has yielded modest commercial success. However, working petroleum systems have been proven in all the offshore basins. The pace of exploration has been controlled by: (a) data quality and technological advances; (b) geological understanding and plays; (c) fiscal and infrastructural environments; and (d) international conditions. Irish offshore exploration drilling started in the Celtic Sea basins in 1970 and the region has seen a recent renewal of exploration interest, stimulated by new and much improved seismic data. In the Atlantic margin basins west of Ireland, there has been a recent significant improvement in the understanding of the geological evolution and petroleum systems, especially in the hyperextended basins such as the Porcupine and Rockall basins. Here the major targets of current exploration are stratigraphic traps at Lower Cretaceous and Lower Cenozoic levels. The application of new and innovative seismic and other geophysical technologies in a number of the Irish offshore basins has led to significant enhancement in data quality and in resolving imaging challenges. Combined with recent geological learnings, they offer renewed hope for exploration success in the Irish offshore basins.
Abstract The Porcupine Basin, part of the frontier petroleum exploration province west of Ireland, has an extended history that commenced prior to the opening of the North Atlantic Ocean. Lithospheric stretching factors have previously been estimated to increase from <2 in the north to >6 in the south of the basin. Thus, it is an ideal location to study the processes leading to hyper-extension on continental margins. The Porcupine Median Ridge (PMR) is located in the south of the basin and has been alternatively interpreted as a volcanic feature, a serpentinite mud diapir or a tilted block of continental crust. Each of these interpretations has different implications for the thermal history of the basin. We present results from travel-time tomographic modelling of two approximately 300 km-long wide-angle seismic profiles across the northern and southern parts of the basin. Our results show: (1) the geometry of the crust, with maximum crustal stretching factors of up to 6 and 10 along the northern and southern profiles, respectively; (2) asymmetry of the basin structures, suggesting some simple shear during extension; (3) low velocities beneath the Moho that could represent either partially serpentinized mantle or mafic under-plating; and (4) a possible igneous composition of the PMR.
Geological and geophysical evidence for a mafic igneous origin of the Porcupine Arch, offshore Ireland
A revised and improved age model for the middle Miocene part of IODP Site U1318 (Porcupine Basin, offshore southwestern Ireland)
Abstract: Until recently, there have been relatively few natural examples of basement fault reactivation, demonstrating convincing hard-linkage to underlying structure and a well-constrained three-dimensional (3D) geometry and timing of reactivation. Applying various quantitative techniques to high quality 3D seismic data, we describe the Cenozoic structure and growth of a reactivated Mesozoic normal fault in the NW Porcupine Basin, west of Ireland. We demonstrate a previously unrecognized period of Mid–Late Eocene extensional reactivation with a tectonic, rather than the previously suggested compactional, origin. East–west extensional reactivation of a north–south- to NE–SW-trending basement fault led to the development of a highly segmented and systematically stepping fault array in the Cenozoic cover. A clear relationship between the displacement of hanging-wall antithetic faults and displacement along the main synthetic system is attributed to the antithetics primarily accommodating strain associated with a hanging-wall rollover anticline. Our study shows that displacement analysis provides an excellent basis for defining the kinematics of basement fault reactivation, and the importance of fault segmentation and twisting during the upwards propagation of reactivated faults. Fault timing corresponds to a period of rapid differential subsidence, the magnitude of which is too large to be attributable solely to extensional reactivation of basement faults.
Abstract This Special Report comprehensively describes the stratigraphy and correlation of the Tertiary (Paleogene-Neogene) rocks of NW Europe and the adjacent Atlantic Ocean and is the summation of fifty years of research on Tertiary sediments by Chris King. His book is essential reading for all geologists who deal with Tertiary rocks across NW Europe, including those in the petroleum industry and geotechnical services as well as academic stratigraphers and palaeontologists. Introductory sections on chronostratigraphy, biostratigraphy and other methods of dating and correlation are followed by a regional summary of Tertiary sedimentary basins and their framework and an introduction to Tertiary igneous rocks. The third and largest segment comprises the regional stratigraphic summaries. Regions covered are the North Sea Basin, on shore areas of southern England and the eastern English Channel area, the North Atlantic margins (including non-marine basins in the Irish Sea and elsewhere) and the Paleogene igneous rocks of Scotland.
Comparison of lithosphere structure across the Orphan Basin–Flemish Cap and Irish Atlantic conjugate continental margins from constrained 3D gravity inversions
Structural and stratigraphic evolution of the Connemara discovery, Northern Porcupine Basin: significance for basin development and petroleum prospectivity along the Irish Atlantic Margin
Successive detachment faults and mantle unroofing at magma-poor rifted margins
Hydrocarbon migration in the Porcupine Basin, offshore Ireland: evidence from fluid inclusion studies
Abstract Deepwater sedimentary basins are attracting increased attention from the hydrocarbon industry and academia as they remain one of the last geological frontiers still to be fully explored and understood. As part of a regional project to understand basin development offshore Ireland, we have developed and tested new ways of improving seismic images, and of incorporating these improvements into geological interpretations. Here we illustrate this methodology using three case histories from the Porcupine, Slyne and Erris Basins. In each case, the first stage of the workflow consists of reprocessing a selection of key seismic data. Processing includes relative amplitude preservation and advanced demultiple and interpretation-driven pre-stack depth imaging. Interpretation of the data is assisted by incorporating products such as multiple models, pre-stack gathers, velocity models and attributes. Finally, we show how a velocity model can be inverted to exhumation estimates. The results and approach developed here can be applied to other deepwater exploration areas.