Reidar Müller

• Hansen, Henrik Nygaard; Haile, Beyene Girma; Müller, Reidar & Jahren, Jens (2022). New direction for regional reservoir quality prediction using machine learning - Example from the Stø Formation, SW Barents Sea, Norway. Journal of Petroleum Science and Engineering. ISSN 0920-4105. 220. doi: 10.1016/j.petrol.2022.111149. Full text in Research Archive
• Müller, Reidar; Klausen, T.G.; Line, L.H.; Hafeez, A.; Planke, Sverre & Eide, F. [Show all 10 contributors for this article] (2022). Tectonostratigraphic development of the Upper Triassic to Middle Jurassic in the Hoop Area, Barents Sea: Implications for understanding ultra-condensed reservoir units. Marine and Petroleum Geology. ISSN 0264-8172. 145. doi: 10.1016/j.marpetgeo.2022.105787. Full text in Research Archive Show summary

  The most prolific reservoir intervals in the Barents Sea are found in the Upper Triassic to Middle Jurassic Realgrunnen Subgroup, deposited during a major change in the structural evolution of the basin which greatly influenced its development and distribution. The effects are evident in one of the petroleum provinces in the SW Barents Sea, the Hoop Area. Due to the condensed nature of the succession, the tectonostratigraphic evolution has been enigmatic. We use a range of different methods and dataset, including high-resolution P-Cable seismic to determine the tectono-stratigraphic evolution of the succession. Results are important for exploration and production in the Hoop Area and beyond, but also for a broader understanding of how ultra-condensed successions might evolve during long periods of non-deposition and short bursts of deposition. Seven major phases of deposition and non-deposition/erosion are defined. Stage 1 represents fluvio-deltaic deposition in the Fruholmen Formation (Norian), followed by Stage 2 with significant truncation and non-deposition, lasting up to 35 million years. Deposition resumed with the shallow marine to fluvial Nordmela and Stø formations (Pliensbachian to Bajocian), which both encapsule long periods of erosion and non-deposition (stage 3–6). Stage 7 is represented by transgression and shelf deposition in the Fuglen Formation (Bathonian). The change from a high-accommodation setting with continuous and relatively high rate of accumulation in the Triassic, to a low-accommodation setting with episodic deposition and extensive sediment cannibalization in the Jurassic, resulted in cleaner sandstones with better reservoir properties. The low-accommodation setting also enabled coarse-graded detritus from hinterlands in Fennoscandia to prograde into distal part of the basin and more amalgamation of the sands during the Jurassic. Adversely, the low accommodation setting also caused a fragmented pattern of deposition and preservation that needs to be carefully considered in subsurface datasets, often with limited resolution.

• Klausen, Tore Grane; Rismyhr, Bjarte; Müller, Reidar & Olaussen, Snorre (2022). Changing provenance and stratigraphic signatures across the Triassic–Jurassic boundary in eastern Spitsbergen and the subsurface Barents Sea. Norwegian Journal of Geology. ISSN 2387-5844. 102. doi: 10.17850/njg102-2-1. Full text in Research Archive
• Line, Lina Hedvig; Müller, Reidar; Klausen, Tore Grane; Jahren, Jens & Hellevang, Helge (2020). Distinct petrographic responses to basin reorganization across the Triassic–Jurassic boundary in the southwestern Barents Sea. Basin Research. ISSN 0950-091X. 32(6), p. 1463–1484. doi: 10.1111/bre.12437. Full text in Research Archive
• Klausen, Tore Grane; Müller, Reidar; Poyatos More, Miquel; Olaussen, Snorre & Stueland, Eirik (2019). Tectonic, provenance and sedimentological controls on reservoir characteristics in the Upper Triassic–Middle Jurassic Realgrunnen Subgroup, SW Barents Sea. Geological Society Special Publication. ISSN 0305-8719. 495, p. 237–261. doi: 10.1144/SP495-2018-165.
• Müller, Reidar; Klausen, Tore Grane; Faleide, Jan Inge; Olaussen, Snorre; Eide, Christian Haug & Suslova, Anna A. (2019). Linking regional unconformities in the Barents Sea to compression-induced forebulge uplift at the Triassic-Jurassic transition. Tectonophysics. ISSN 0040-1951. 765, p. 35–51. doi: 10.1016/j.tecto.2019.04.006. Full text in Research Archive
• Eide, Christian Haug; Muller, Reidar & Helland-Hansen, William (2018). Using climate to relate water-discharge and area in modern and ancient catchments. Sedimentology. ISSN 0037-0746. 65(4), p. 1378–1389. doi: 10.1111/sed.12426. Full text in Research Archive Show summary

  Models relating sediment supply to catchment properties are important in order to use the geological record to deduce landscape evolution and interplay between tectonics and climate. Water-discharge (Qw) is an important factor in the widely used BQART-model of Syvitski and Milliman (2007), which relates sediment load to a set of measureable catchment parameters. Although many of the factors in this equation may be independently estimated with some degree of certainty in ancient systems, water-discharge (Qw) certainly cannot. An analysis of a world database of modern catchments (Milliman and Farnsworth, 2011) shows that the commonly applied equation relating catchment area (A) to water-discharge (Qw=0.075A0.8), does not predict water-discharge from catchment area well in many cases (R2=0.5 and an error spanning c. 3 orders-of-magnitude). This is because the method does not incorporate the effect of arid and wet climate on river water-discharge. The inclusion of climate-data into such estimations is an opportunity to refine these estimates, because generalized estimates of palaeoclimate can often be deduced on the basis of sedimentological data such as palaeosol types, mineralogy and palaeohydraulics. This paper investigates how the relationship between catchment area and river discharge vary with four runoff categories (arid, semiarid, humid, and wet) which are recognizable in the geological record, and modifies the coefficient and exponent of the abovementioned equation according to these classes. Our modified model yields improved results in relating discharge to catchment area (R2=0.95 and error spanning 1 order-of-magnitude) when core-, outcrop- or regional palaeoclimate reconstruction data are available in non-arid systems. Arid systems have an inherently variable water-discharge, and catchment area is less important as a control due to downstream losses. The model here is sufficient for many geological applications and makes it possible to include variations in catchment humidity in mass-flux estimates in ancient settings.

• Hansen, Henrik Nygaard; Løvstad, Kristoffer; Muller, Reidar & Jahren, Jens (2017). Clay coating preserving high porosities in deeply buried intervals of the Stø Formation. Marine and Petroleum Geology. ISSN 0264-8172. 88, p. 648–658. doi: 10.1016/j.marpetgeo.2017.09.011. Full text in Research Archive
• Klausen, Tore Grane; Muller, Reidar; Slama, Jiri; Olaussen, Snorre; Rismyhr, Bjarte & Helland-Hansen, William (2017). Depositional history of a condensed shallow marine reservoir succession: stratigraphy and detrital zircon geochronology of the Jurassic Stø Formation, Barents Sea. Journal of the Geological Society. ISSN 0016-7649. 175(1), p. 130–145. doi: 10.1144/jgs2017-024.
• Nystuen, Johan Petter; Mørk, Atle; Muller, Reidar & Nøttvedt, Arvid (2013). Fra ørken til elveslette - fra land til hav. Trias; 252-201 millioner år. In Ramberg, Ivar B.; Bryhni, Inge; Nøttvedt, Arvid & Rangnes, Kristin (Ed.), Landet blir til. Norges geologi. Norsk Geologisk Forening. ISSN 978-82-92-39483-0. p. 332–357.
• Hurum, Jørn Harald; Bergan, Morten; Muller, Reidar; Nystuen, Johan Petter & Klein, Nicole (2006). A Late Triassic dinosaur bone, offshore Norway. Norsk Geologisk Tidsskrift. ISSN 0029-196X. 86, p. 117–123.
• Oftedal, Bjørn Terje; Andresen, Arild & Muller, Reidar (2005). Early Triassic syn-rift sedimentation at Hold with Hope, Northeast Greenland. In Wandås, Bjørn T.G.; Nystuen, Johan Petter; Eide, Elizabeth & Gradstein, Felix M (Ed.), Onshore-offshore relationships on the North Atlantic margin.Proceedings of the Norwegian Petroleum Society Conference, October 2002, Trondheim, Norway. Elsevier. ISSN 0-444-51849-5. p. 191–206.
• Muller, Reidar; Nystuen, Johan Petter; Eide, Frøydis & Lie, Hege (2005). Late Permian to Triassic basin infill history and palaeogeography of the Mid-Norwegian shelf - East Greenland region. In Wandås, Bjørn T.G.; Nystuen, Johan Petter; Eide, Elizabeth & Gradstein, Felix M (Ed.), Onshore-offshore relationships on the North Atlantic margin.Proceedings of the Norwegian Petroleum Society Conference, October 2002, Trondheim, Norway. Elsevier. ISSN 0-444-51849-5. p. 165–189.
• Muller, Reidar; Nystuen, Johan Petter & Wright, Paul V. (2004). Pedogenic mud aggregates and paleosol development in ancient dryland river systems: Criteria for interpreting alluvial mudrock origin and floodplain dynamics. Journal of Sedimentary Research. ISSN 1527-1404. 74(4), p. 537–551.

View all works in Cristin

• Svensen, Henrik Hovland & Müller, Reidar (2022). Lanseringssamtale, Et land av stein.
• Svensen, Henrik & Müller, Reidar (2020). Under asfalten – Oslo lag for lag. Henrik Svensen i samtale Reidar Müller.
• Hansen, Henrik Nygaard; Løvstad, Kristoffer; Jahren, Jens & Muller, Reidar (2017). Stø Formation Reservoir Properties in Wells 7220/12-2, 7220/2-3S, 7120/6-1 and 7121/5-1 from the Hammerfest Basin, Southwestern Barents Sea.
• Eide, Christian Haug; Muller, Reidar & Helland-Hansen, William (2016). Relating water-discharge and catchment area in modern and ancient catchments.
• Murase, Takemi; Klausen, Tore Grane; Muller, Reidar & Helland-Hansen, William (2015). Sedimentology of clinoformal successions; Kobbe and Snadd formations (Triassic), Barents Sea.
• Klausen, Tore Grane; Helland-Hansen, William & Muller, Reidar (2015). Considerations surrounding decompaction and restoration of clinoforms –towards quantification of prodelta and shelf edge geometries in the Triassic succession of the Barents Sea.
• Nystuen, Johan Petter; Mørk, Atle; Adestål, Victoria; Bue, Edina Pozer; Glørstad-Clark, Evy & Hynne,, Ingrid [Show all 17 contributors for this article] (2010). Depositional systems and sequence development contrasted by climatic differences: the Triassic of the North Sea area, Mid-Norwegian shelf, the Barents Sea and Svalbard.
• Bjørlykke, Knut & Muller, Reidar (2004). Lider forskning og utvikling under økonomene? Aftenposten (morgenutg. : trykt utg.). ISSN 0804-3116.
• Svensen, Henrik & Muller, Reidar (2004). Darwin er død, Gud lever - i Amerika. Aftenposten (morgenutg. : trykt utg.). ISSN 0804-3116. p. 20–21.
• Svensen, Henrik & Muller, Reidar (2002). Leve vitenskapsjournalistikken? Forskning.no. ISSN 1891-635X. July.
• Muller, Reidar & Svensen, Henrik (2002). Norge � en miljøversting. Forskning.no. ISSN 1891-635X. desember.
• Muller, Reidar; Nystuen, Johan Petter & Adestål, Victoria (2002). Dryland mudrocks and paleosols of the Upper Triassic - Lower Jurassic Lunde and Stafjord Formations, northern North Sea: implications for paleoclimate and basin infill dynamics.
• Nystuen, Johan Petter; Muller, Reidar; Bergan, Morten; Diesen, Geir W. & Knarud, Ragnar (2002). Alluvial sedimentation in a dryland environment; the Late Triassic to Early Jurassic Lunde and Statfjord Formations, northern North Sea.
• Svensen, Henrik & Muller, Reidar (2001). Erindringer fra jordens barndom. Viten (www.viten.com). januar.
• Muller, Reidar & Svensen, Henrik (2001). På sporet av den tapte tid. Klassekampen. ISSN 0805-3839. p. 28–29.
• Svensen, Henrik & Muller, Reidar (2000). Stein - et vindu til fortiden. Viten (www.viten.com). juni.
• Muller, Reidar & Svensen, Henrik (1999). Forskere og pseudovitenskap. Aftenposten (morgenutg. : trykt utg.). ISSN 0804-3116.

View all works in Cristin