• Document: Neogene Uplift of The Barents Sea
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Neogene Uplift of The Barents Sea W. Fjeldskaar A. Amantov Tectonor/UiS, Stavanger, Norway FORCE seminar April 4, 2013 The project (2010-2012) Funding companies Flat Objective The objective of the work was to improve our understanding of the timing, geometry and magnitude of the Neogene and Quaternary erosion and uplift of the FlatRussian and Norwegian parts of the Barents Sea. Outline Plio-Pleistocene glaciations - extent and timing Effects of glaciers Estimates/modelling of glacial erosion Isostatic effects (tilting Flatof reservoirs) Temperature- og maturity effects Estimations of Neogene Erosion Plio-Pleistocene Flat glaciations Deglaciation - last glaciation Glacial-Interglacial cycles From deep sea sediments At least 8 glacial-interglacial cycles over the last 800 000 years, and maybe 30 cycles since late Pliocene. 3 Plio-Pleistocene phases Typical 3.5-2.4 Ma glaciations 2.4–1.0 Ma < 1.0 Ma Knies et al (2009) Plio-Pleistocene Glaciations 1st phase 2nd phase Estimations of Pliocene drainage pattern. 3rd phase Maximum possible ice extent and thicknesses for three periods of Plio- Pleistocene Heat flow Surface temperature Hydrocarbon Temperature generation history Thermal conductivity EFFECTS OF Erosion GLACIATIONS Flat ON Faults/seal PETROLEUM Erosion Tilting SYSTEMS Hydrocarbon Faults/ seal Stress changes Ice loads leakage? Tilting Ridge push Faults Effects Glaciations Surface temperature Petroleum systems Thermal conductivity temperature Compaction maturity Isostatic effects Flat migration routes Elastic effects leakage Stress effects reservoir quality Erosion Glacial erosion Implications Source rock is generally located at too low temperatures to be generating hc recently. Quantifying the amount of erosion in the glacial period will be an important step in the direction of quantification of max burial (time and amount). This is important for the understanding of petroleum systems in the Barents Sea. Effects of glaciations – Glacial erosion Flat Morphological modelling Flat Morphological modelling Concentric pattern forms due to low ice velocity under the center, and more rapid basal ice velocity near the margins Effect of ice streams with enhanced Estimations of Pliocene drainage pattern. erosional capacity Model of pre-glacial landscape with major drainage pattern Different erodability of sedimentary bedrock and Illustration of the erosion model basement lithologies Erosion modeling Early phase Mid phase Predict Flat erosion Late phase Knies et al (2009) Plio-Pleistocene Glaciations 1st phase 2nd phase Estimations of Pliocene drainage pattern. 3rd phase Maximum possible ice extent and thicknesses for three periods of Plio- Pleistocene Ice Thickness Module Ice Thickness computed f

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