Beyene Girma Haile

• 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. Fulltekst i vitenarkiv Vis sammendrag

  Recently, the petroleum industry has focused on deeply buried reservoir discoveries and exploring potential CO2 storage sites close to existing infrastructure to increase the life span of already operating installations to save time and cost. It is therefore essential for the petroleum industry to find an innovative approach that exploits the existing core- and well log data to be successful in their endeavor of effectively characterizing and predicting reservoir quality. Continuous data sources (e.g. wireline logs) have a huge potential compared with expensive, time inefficient and sporadic data from cores in determining reservoir quality for use in a regional context. However, whereas core analysis offers in-depth knowledge about rock properties and diagenetic processes, continuous data sources can be difficult to interpret without a formation-specific framework. Here, we demonstrated how the pre-existing core data could be effectively used by integrating petrographic- and facies data with a pure predictive machine learning (ML) based porosity predictor. The inclusion of detailed core analysis is important for determining which reservoir parameter(s) that should be modeled and for the interpretation of model outputs. By applying this methodology, a framework for deducing lithological and diagenetic attributes can be established to aid reservoir quality delineation from wireline logs that can be used in frontier areas. With the ML porosity model, a Random Forest Regressor, the square of the correlation was 0.84 between predicted- and helium porosity test data over a large dataset consisting of 38 wells within the Stø Formation across the SW Barents Sea. By integrating the continuous ML porosity logs and core data, it was possible to differentiate three distinct bed types on wireline log responses within the Stø Formation. Particularly, the relationship between Gamma ray (GR) and porosity was effective in separating high porosity clean sand-, low porosity cemented clean sand and more clay and silt rich intervals. Additionally, in the P-wave velocity (VP) - density domain, separation of high porosity clean sand- and heavily cemented low porosity clean sand intervals were possible. The results also show that the ML derived porosity curves coincide with previously published and independent facies data from a selection of the wells included in the study. This demonstrates the applicability of the model in the region, because the Stø Formation has been described to exhibit similar lithological- and mineralogical properties over large parts of the Western Barents Sea area. Even though, continuous porosity data could be estimated from other sources like VP, neutron or density logs, this would generally require matrix and fluid information. This study demonstrated the effectiveness of the ML model in generating continuous porosity logs that are useful for characterizing and predicting reservoir properties in new wells. This methodology offers a workflow for exploiting already acquired core and well log data for frontier exploration that can be adapted to other formations and exploration scenarios worldwide.

• Haile, Beyene Girma; Hansen, Henrik Nygaard; Aagaard, Per & Jahren, Jens (2022). How do chlorite coatings form on quartz surface? Journal of Petroleum Science and Engineering. ISSN 0920-4105. 215. doi: 10.1016/j.petrol.2022.110682. Fulltekst i vitenarkiv Vis sammendrag

  Chlorite-coats on quartz surfaces are ubiquitous in various sedimentary environments. Chlorite-coats shield the surface of quartz from quartz cement overgrowths, thus preserving anomalously high porosity in deeply buried sandstone reservoirs. The inhibition of the quartz cement implies that the chlorite-coats on the surface of quartz grains can significantly influence the physicochemical behavior of the quartz grains. Therefore, failure to notice the initial thin microscale coatings forming during deposition can have serious consequences for modeling several geochemical reactions occurring at liquid-solid interfaces. Despite this huge implication, the fundamental mechanisms involved in chlorite-coat formation is not well understood. Here we present an experimental study to determine the parameters that control chlorite-coat formation on the surface of quartz grains. The batch experiments were conducted in a concoction of quartz and chlorite under different conditions of ionic strength, pH, and presence of humic acid (HA), iron- (Fe) and aluminum (Al) oxides). HA, Fe- and Al oxides are suggested to aid the emplacement of chlorite-coat precursors. At pH 7, the quartz–chlorite and quartz–chlorite–Fe/Al-oxides mixing experiments performed in saline and non-saline solution result in equal chlorite-coat coverages, suggesting neither salinity nor Fe and Al-oxides explain the mechanisms of chlorite-coat formation. At pH 5 and 9, however the chlorite-coat coverage was superior only in saline solution, indicating differences in coat coverage may be caused by variable electrokinetic charge distribution due to the distribution and transport of dissolved salt. The chlorite-coat barely formed in experiments that contain HA in quartz–chlorite mixtures regardless of ionic strength and pH. Against a long-standing notion, the presence of organic matter cannot necessarily be prerequisites for binding chlorite on the surface of quartz grains. The dynamic interactions between solution chemistry and surface chemistry of solid phases (quartz, chlorite, HA, Fe and Al oxides) can result in changing the electrokinetic properties in a region near the solid phases and at mineral-solution interfaces. We therefore propose that the electrokinetic response that arises in heterogeneous systems may explain the mechanisms of chlorite-coat formation.

• Hellevang, Helge; Line, Lina Hedvig; Eide, Christian Haug; Jahren, Jens Sigurd & Haile, Beyene Girma (2021). Insights into past tectonism from authigenic quartz. Geochemical Perspectives Letters. ISSN 2410-339X. 19, s. 27–31. doi: 10.7185/geochemlet.2130. Fulltekst i vitenarkiv Vis sammendrag

  Authigenic quartz grains carry information that is diagnostic for the thermal history and thereby the burial depth and uplift of sediments. Recycled quartz grains with embayed or rounded authigenic remnants have been observed globally, but the value of these grains in unravelling past tectonism is presently underexplored. In this study, we launch a new method to demonstrate that cathodoluminescence (CL) in combination with fluid inclusion data and textural characteristics of authigenic quartz can provide important information about past tectonic activity. Vital in the method is the realisation that recycled quartz grains can be distinguished from other quartz grains by their geochemical CL fingerprint, allowing tracking of uplifted source terrains in a direction towards higher fractions of the recycled grains. Furthermore, regional mapping can reveal both intra-basinal recycling as well as recycled grains transported into the basin from external sources. The new proposed method is simple and does not require more than a standard Scanning Electron Microscope equipped with a CL detector, available at many geoscientific institutions worldwide. This innovative approach applies to a wide section of geoscientific disciplines, and complement and supplement other conventional methods used for unravelling past tectonism.

• Xi, Kelai; Cao, Yingchang; Haile, Beyene Girma; Zhu, Ning; Liu, Keyu & Wu, Songtao [Vis alle 7 forfattere av denne artikkelen] (2021). Diagenetic variations with respect to sediment composition and paleo-fluids evolution in conglomerate reservoirs: A case study of the Triassic Baikouquan Formation in Mahu Sag, Junggar Basin, Northwestern China. Journal of Petroleum Science and Engineering. ISSN 0920-4105. 197. doi: 10.1016/j.petrol.2020.107943. Fulltekst i vitenarkiv
• Czarniecka, Urszula; Haile, Beyene Girma; Braathen, Alvar; Krajewski, Krzysztof P.; Kristoffersen, Magnus & Jokubauskas, Petras (2020). Petrography, geochemistry and U-Pb zircon ages as indicators of provenance: the case of Middle Triassic deposits of the Bravaisberget Formation, Sørkappøya of Svalbard. Norwegian Journal of Geology. ISSN 2387-5844. 100. doi: 10.17850/njg100-3-5. Fulltekst i vitenarkiv
• Xi, Kelai; Cao, Yingchang; Li, Ke; Liu, Keyu; Zhu, Rukai & Haile, Beyene Girma (2020). Insight into pore-throat size distribution and the controls on oil saturation of tight sandstone reservoirs using nuclear magnetic resonance parameters: A case study of the Lower Cretaceous Quantou Formation in the southern Songliao Basin, China. American Association of Petroleum Geologists Bulletin. ISSN 0149-1423. 104(11), s. 2351–2377. doi: 10.1306/04082018141. Fulltekst i vitenarkiv
• Czarniecka, Urszula; Haile, Beyene Girma; Braathen, Alvar; Krajewski, Krzysztof P.; Kristoffersen, Magnus & Jokubauskas, Petras (2020). Petrography, bulk-rock geochemistry, detrital zircon U–Pb geochronology and Hf isotope analysis for constraining provenance: An example from Middle Triassic deposits (Bravaisberget Formation), Sørkappøya, Svalbard. Norwegian Journal of Geology. ISSN 2387-5844. doi: 10.17850/njg008. Fulltekst i vitenarkiv
• Haile, Beyene Girma; Line, Lina Hedvig; Klausen, Tore Grane; Olaussen, Snorre; Eide, Christian Haug & Jahren, Jens [Vis alle 7 forfattere av denne artikkelen] (2020). Quartz overgrowth textures and fluid inclusion thermometry evidence for basin-scale sedimentary recycling: An example from the Mesozoic Barents Sea Basin. Basin Research. ISSN 0950-091X. 33(3). doi: 10.1111/bre.12531. Fulltekst i vitenarkiv Vis sammendrag

  Sedimentary recycling has the potential to obscure source-to-sink relationships, provenance interpretations, burial history reconstructions and robust reservoir quality predictions in siliciclastic sedimentary basins. Here, we integrate petrographic and cathodoluminescence microtextures with fluid inclusion thermometry in quartz overgrowths to identify sedimentary recycling and to constrain the potential provenance candidate for recycled grains in Lower Mesozoic sandstone of the western Barents Sea basin. Four diagenetic imprints were recognized as proof of sediment recycling: (a) microtextural surface properties of overgrowths, (b) the presence of overgrowths at sutured grain contacts, (c) reversed diagenetic sequences and (d) fluid inclusions within quartz overgrowths. The diagenetic imprints confirm delivery of recycled sediments across the western Barents Sea basin. Their widespread distribution across the basin suggest that the recycled grains were derived from a drainage basin with regional-scale sediment dispersal potential during the latest Triassic. Furthermore, the drainage basin must have contained sedimentary rocks. Prior to surface exposure, the precursor sedimentary basin was subjected to burial temperatures exceeding 130°C, whereby syntaxial quartz overgrowths precipitated. This temperature indicates an uplift of around 3–4 km, which represents a significant tectonic event. Recycled quartz grains can provide insights on their provenance as they retain direct temperature records. The geothermal signatures and geographically widespread distribution of recycled quartz exclude spatially restricted intrabasinal highs and higher-temperature crystalline rocks as provenance candidates for the recycled grain portion. Our data support the contemporaneous Novaya Zemlya Fold and Thrust Belt as the most likely provenance candidate in the region. The integrated approach demonstrated herein can be used to constrain sediment recycling and partly eroded provenance candidates in sedimentary basins of equivalent setting worldwide, particularly in quartz-rich strata susceptible to sediment supply from older uplifted sedimentary basins.

• Haile, Beyene Girma; Czarniecka, Urszula; Xi, Kelai; Smyrak-Sikora, Aleksandra; Jahren, Jens & Braathen, Alvar [Vis alle 7 forfattere av denne artikkelen] (2019). Hydrothermally induced diagenesis: Evidence from shallow marine-deltaic sediments, Wilhelmøya, Svalbard. Geoscience Frontiers (GSF). ISSN 1674-9871. 10(2), s. 629–649. doi: 10.1016/j.gsf.2018.02.015. Fulltekst i vitenarkiv Vis sammendrag

  Sedimentary basins containing igneous intrusions within sedimentary reservoir units represent an important risk in petroleum exploration. The Upper Triassic to Lower Jurassic sediments at Wilhelmøya (Svalbard) contains reservoir heterogeneity as a result of sill emplacement and represent a unique case study to better understand the effect of magmatic intrusions on the general burial diagenesis of siliciclastic sediments. Sills develop contact metamorphic aureoles by conduction as presented in many earlier studies. However, there is significant impact of localized hydrothermal circulation systems affecting reservoir sediments at considerable distance from the sill intrusions. Dolerite sill intrusions in the studied area are of limited vertical extent (∼12 m thick), but created localized hydrothermal convection cells affecting sediments at considerable distance (more than five times the thickness of the sill) from the intrusions. We present evidence that the sedimentary sequence can be divided into two units: (1) the bulk poorly lithified sediment with a maximum burial temperature much lower than 60–70 °C, and (2) thinner intervals outside the contact zone that have experienced hydrothermal temperatures (around 140 °C). The main diagenetic alteration associated with normal burial diagenesis is minor mechanical plastic deformation of ductile grains such as mica. Mineral grain contacts show no evidence of pressure dissolution and the vitrinite reflectance suggests a maximum temperature of ∼40 °C. Contrary to this, part of the sediment, preferentially along calcite cemented flow baffles, show evidence of hydrothermal alteration. These hydrothermally altered sediment sections are characterized by recrystallized carbonate cemented intervals. Further, the hydrothermal solutions have resulted in localized sericitization (illitization) of feldspars, albitization of both K-feldspar and plagioclase and the formation of fibrous illite nucleated on kaolinite. These observations suggest hydrothermal alteration at T > 120–140 °C at distances considerably further away than expected from sill heat dissipation by conduction only, which commonly affect sediments about twice the thickness of the sill intrusion. We propose that carbonate-cemented sections acted as flow baffles already during the hydrothermal fluid mobility and controlled the migration pathways of the buoyant hot fluids. Significant hydrothermally induced diagenetic alterations affecting the porosity and hence reservoir quality was not noted in the noncarbonate-cemented reservoir intervals.

• Braathen, Alvar; Midtkandal, Ivar; Mulrooney, Mark; Appleyard, Tyler Ross; Haile, Beyene Girma & Yperen, Anna Elisabeth van (2018). Growth-faults from delta collapse - structural and sedimentological investigation of the Last Chance delta, Ferron Sandstone, Utah. Basin Research. ISSN 0950-091X. 30(4), s. 688–707. doi: 10.1111/bre.12271. Fulltekst i vitenarkiv
• Nooraiepour, Mohammad; Haile, Beyene Girma & Hellevang, Helge (2018). Rock-physics characterization and geomechanical properties of mudstones rich in siliceous ooze: A case study from the primary caprock for Skade Formation, North Sea, SEG Technical Program Extended Abstract 2018. SEGEAB. ISSN 9785867085773. s. 3724–3728. doi: 10.1190/segam2018-2991324.1. Fulltekst i vitenarkiv Vis sammendrag

  This study has investigated rock physics characteristics and geomechanical properties of Middle Miocene mudstones in the Norwegian North Sea as the primary caprock for the Skade CO2 storage reservoir. To evaluate the seal properties, we analyzed collected drill cuttings and measured well logs from well 16/4-1, in addition to an extensive well log database in the Northern North Sea. The studied caprock was identified as siliceous ooze-rich mudstones with low bulk density, high shear wave velocity, and low Vp/Vs ratio. The abundance of siliceous skeletal material resulted in a significant shift from the overall trend of mudstones within the Hordaland Group. The estimated scenarios for S-wave velocity depicted that the ooze-rich mudstones have the highest brittleness of the Hordaland Group semiconsolidated rocks. The more brittle ooze-rich mudstones also indicated the lowest estimation of fracture pressure compared to other scenarios. The research outcomes emphasize the influence of mudstone type and presence of siliceous skeletal material on the macroscale physical properties of shallow semi-compacted mudstones.

• Haile, Beyene Girma; Klausen, Tore Grane; Czarniecka, Urszula; Xi, Kelai; Jahren, Jens & Hellevang, Helge (2018). How are diagenesis and reservoir quality linked to depositional facies? A deltaic succession, Edgeøya, Svalbard. Marine and Petroleum Geology. ISSN 0264-8172. 92, s. 519–546. doi: 10.1016/j.marpetgeo.2017.11.019. Fulltekst i vitenarkiv
• Haile, Beyene Girma; Klausen, Tore Grane; Jahren, Jens; Braathen, Alvar & Hellevang, Helge (2018). Thermal history of a Triassic sedimentary sequence verified by a multi-method approach: Edgeøya, Svalbard, Norway. Basin Research. ISSN 0950-091X. 30(6), s. 1075–1097. doi: 10.1111/bre.12292. Fulltekst i vitenarkiv
• Hellevang, Helge; Haile, Beyene Girma & Abednego, Tetteh (2017). Experimental study to better understand factors affecting the CO2 mineral trapping potential of basalt. Greenhouse Gases: Science and Technology. 7(1), s. 143–157. doi: 10.1002/ghg.1619. Fulltekst i vitenarkiv
• Nooraiepour, Mohammad; Haile, Beyene Girma & Hellevang, Helge (2017). Compaction and mechanical strength of Middle Miocene mudstones in the Norwegian North Sea - the major seal for the Skade CO2 storage reservoir. International Journal of Greenhouse Gas Control. ISSN 1750-5836. 67, s. 49–59. doi: 10.1016/j.ijggc.2017.10.016. Fulltekst i vitenarkiv Vis sammendrag

  This study has investigated petrophysical, acoustic and geomechanical properties of Middle Miocene mudstones in the Norwegian North Sea as the primary caprock for Skade CO2 storage reservoir. To evaluate the seal properties, we analyzed collected drill cuttings and measured well logs from well 16/4-1, in addition to an extensive well log database in the Northern North Sea. The studied caprock was identified as siliceous ooze-rich mudstones with low bulk density, high shear wave velocity, and low Vp/Vs ratio. The abundance of siliceous skeletal material resulted in a significant shift from the overall trend of mudstones within the Hordaland Group. The estimated scenarios for S-wave velocity depicted that the ooze-rich mudstones have the highest brittleness of the Hordaland Group semi-consolidated rocks. The brittleness indices in well 16/4-1 illustrated that the mineralogical composition-based indices significantly overestimate brittleness compared to the elastic-based indices. While the caprock for Skade CO2 storage reservoir showed an overall ductility, the bottom 30 m demonstrated an increased brittleness profile. The more brittle ooze-rich mudstones also indicated the lowest estimation of fracture pressure compared to other scenarios. The research outcomes emphasize on the influence of mudstone type and microstructure on the macroscale physical properties of shallow semi-compacted CO2 caprocks.

• Yang, Tian; Cao, Ying-Chang; Wang, Yan-Zhong; Friis, Henrik; Haile, Beyene Girma & Xi, Ke-Lai [Vis alle 7 forfattere av denne artikkelen] (2016). The coupling of dynamics and permeability in the hydrocarbon accumulation period controls the oil-bearing potential of low permeability reservoirs: a case study of the low permeability turbidite reservoirs in the middle part of the third member of Shahejie Formation in Dongying Sag. Petroleum Science. ISSN 1672-5107. 13(2), s. 204–224. doi: 10.1007/s12182-016-0099-0. Fulltekst i vitenarkiv
• Xi, Kelai; Cao, Yingchang; Zhu, Rukai; Haile, Beyene Girma & Hellevang, Helge (2016). Evidences of localized CO2-induced diagenesis in the Cretaceous Quantou Formation, southern Songliao Basin, China. International Journal of Greenhouse Gas Control. ISSN 1750-5836. 52, s. 155–174. doi: 10.1016/j.ijggc.2016.07.010. Fulltekst i vitenarkiv
• Hellevang, Helge; Haile, Beyene Girma & Miri, Rohaldin (2016). A Statistical Approach to Explain the Solution Stoichiometry Effect on Crystal Growth Rates. Crystal Growth & Design. ISSN 1528-7483. 16(3), s. 1337–1348. doi: 10.1021/acs.cgd.5b01466. Fulltekst i vitenarkiv
• Xi, Kelai; Cao, Yingchang; Haile, Beyene Girma; Zhu, Rukai; Jahren, Jens & Bjørlykke, Knut [Vis alle 8 forfattere av denne artikkelen] (2016). How does the pore-throat size control the reservoir quality and oiliness of tight sandstones? The case of the Lower Cretaceous Quantou Formation in the southern Songliao Basin, China. Marine and Petroleum Geology. ISSN 0264-8172. 76, s. 1–15. doi: 10.1016/j.marpetgeo.2016.05.001. Fulltekst i vitenarkiv
• Kirstein, Jens; Hellevang, Helge; Haile, Beyene Girma; Gleixner, Gerd & Gaupp, Reinhard (2016). Experimental determination of natural carbonate rock dissolution rates with a focus on temperature dependency. Geomorphology. ISSN 0169-555X. 261, s. 30–40. doi: 10.1016/j.geomorph.2016.02.019. Fulltekst i vitenarkiv
• Haile, Beyene Girma; Hellevang, Helge; Aagaard, Per & Jahren, Jens (2015). Experimental nucleation and growth of smectite and chlorite coatings on clean feldspar and quartz grain surfaces. Marine and Petroleum Geology. ISSN 0264-8172. 68(Part A), s. 664–674. doi: 10.1016/j.marpetgeo.2015.02.006. Fulltekst i vitenarkiv
• Xi, Kelai; Cao, Y; Jahren, Jens; Zhu, R; Bjørlykke, Knut & Haile, Beyene Girma [Vis alle 8 forfattere av denne artikkelen] (2015). Diagenesis and reservoir quality of the Lower Cretaceous Quantou Formation tight sandstones in the southern Songliao Basin, China. Sedimentary Geology. ISSN 0037-0738. 330, s. 90–107. doi: 10.1016/j.sedgeo.2015.10.007. Fulltekst i vitenarkiv
• Xi, Kelai; Cao, Yingchang; Wang, Yanzhong; Haile, Beyene Girma; Zhang, Xiangxiang & Zhang, Jianghua [Vis alle 7 forfattere av denne artikkelen] (2015). Diagenesis and porosity-permeability evolution of low permeability reservoirs: A case study of Jurassic Sangonghe Formation in Block 1, central Junggar Basin, NW China. Shiyou kantan yu kaifa. ISSN 1000-0747. 42(4), s. 475–485. doi: 10.1016/S1876-3804(15)30040-9. Fulltekst i vitenarkiv
• Hellevang, Helge; Miri, Rohaldin & Haile, Beyene Girma (2014). New insights into the mechanisms controlling the rate of crystal growth. Crystal Growth & Design. ISSN 1528-7483. 14(12), s. 6451–6458. doi: 10.1021/cg501294w. Fulltekst i vitenarkiv

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• Haile, Beyene Girma; Line, Lina Hedvig; Klausen, Tore Grane; Olaussen, Snorre; Eide, Christian Haug & Jahren, Jens [Vis alle 7 forfattere av denne artikkelen] (2021). Identifying and constraining sedimentary recycling from microscopic fluid inclusions in quartz overgrowth. Fulltekst i vitenarkiv
• Eide, Christian Haug; Gilmullina, Albina; Sirevaag, Hallgeir; Paterson, Niall William; Haile, Beyene Girma & Line, Lina Hedvig [Vis alle 8 forfattere av denne artikkelen] (2021). Sediment transport and upland linkages in an enormous intracratonic Basin - Insights from cross-disciplinary source-to-sink studies in the Triassic Greater Barents Sea Basin. Fulltekst i vitenarkiv Vis sammendrag

  The Greater Barents Sea Basin (Svalbard, the Russian and Norwegian Barents Sea, the Kara Sea and Franz Josef Land) was about five times the size of the North Sea and filled with enormous amounts of sediments in the Triassic. This is one of the most well-studied and data-rich basins in the world, ancient geomorphology (fluvial channels, clinoforms) is well-imaged in 3D seismic data, and a high-resolution palynostratigraphic framework gives excellent correlations and time-control. This makes the area an excellent place to study sediment transport and develop models for sediment provenance. Most existing studies have however studied only parts of this basin, but in the ongoing ISBAR project, we study the entire basin using an integrated stratigraphic framework and diverse techniques such as seismic interpretation, fluvial geomorphology, detrital zircon dating, sediment mass balance, palynology and petrology. In this presentation, we give an overview of the recent advances made in understanding the Greater Barents Sea Basin and summarize our latest research. These results include variations in amount of sediment supplied to the basin throughout the Triassic, the degree and timing of onset of sediment recycling in the basin, the petrographic and detrital zircon-age signatures of the different sediment sources, and the evolution of petrographic- and detrital zircon-age signatures through time. These variations are discussed in terms of source-area evolution, and they indicate that sediment supply was strongly variable and controlled to geodynamic events in the Urals and West Siberia. Sediment supply from minor, marginal sources (Fennoscandia, Loppa High, Greenland) appears to have varied less through time. Our results also indicate significant bypass of sediment to adjacent arctic basins in the Late Triassic. Upcoming research in the project related to autogenic controls on detrital zircon age spectra, and thermochronology and basin modelling in the Barents Sea, will also be presented.

• Czarniecka, Urszula; Haile, Beyene Girma & Krajewski, Krzysztof (2018). Middle Triassic siliciclastic deposits of Svalbard as a part of source to sink framework of the Arctic. Fulltekst i vitenarkiv
• Haile, Beyene Girma; Klausen, Tore Grane; Czarniecka, Urszula; Xi, Kelai; Jahren, Jens & Braathen, Alvar [Vis alle 7 forfattere av denne artikkelen] (2017). Diagenesis of Upper Triassic sandstones, Edgeøya, Svalbard. Fulltekst i vitenarkiv
• Braathen, Alvar; Mulrooney, Mark; Haile, Beyene Girma; Appleyard, Tyler Ross; Yperen, Anna Elisabeth van & Smyrak-Sikora, Aleksandra Anna [Vis alle 12 forfattere av denne artikkelen] (2017). “Delta collapse” – Edgeøya delta system compared to the Ferron delta (Utah). Fulltekst i vitenarkiv
• Haile, Beyene Girma; Jahren, Jens & Hellevang, Helge (2017). New insights about thermally driven diagenetic changes due to the emplacement of magmatic sills into reservoir sediments at Wilhelmøya (Svalbard): Implications for reservoir quality. Fulltekst i vitenarkiv
• Haile, Beyene Girma; Klausen, Tore Grane; Hellevang, Helge; Jahren, Jens & Bjørlykke, Knut (2016). Burial diagenesis of De Geerdalen Formation control by depositional facies distribution, Edgeøya, Svalbard. Fulltekst i vitenarkiv
• Haile, Beyene Girma; Xi, Kelai; Jahren, Jens; Aagaard, Per; Bjørlykke, Knut & Hellevang, Helge (2015). Burial Diagenesis in Triassic Sandstones: key to understand reservior quality evolution. Fulltekst i vitenarkiv
• Haile, Beyene Girma; Xi, Kelai; Jahren, Jens; Aagaard, Per; Bjørlykke, Knut & Hellevang, Helge (2015). Burial diagenesis in Triassic siliciclastic reservoirs of the Barents Sea region. Fulltekst i vitenarkiv
• Braathen, Alvar; Anell, Ingrid Margareta; Smyrak-Sikora, Aleksandra Anna; Mulrooney, Mark; Haile, Beyene Girma & Ogata, Kei [Vis alle 11 forfattere av denne artikkelen] (2015). Tectonic influence on platform infill patterns in the mid-late Triassic, Southern Edgeøya, Svalbard. Fulltekst i vitenarkiv
• Jahren, Jens; Haile, Beyene Girma; Hellevang, Helge; Bjørlykke, Knut & Ohm, Sverre Ekrene (2013). Fracture Patterns in Organic Rich Mudstones - Implications for Primary Petroleum Migration. EarthDoc. doi: 10.3997/2214-4609.20130098. Fulltekst i vitenarkiv
• Hellevang, Helge; Jahren, Jens; Haile, Beyene Girma & Aagaard, Per (2013). On the kinetics of digenetic reactions – Diffusion /transport limitations on the K-feldspar to illite conversion during burial diagenesis. Fulltekst i vitenarkiv
• Jahren, Jens; Haile, Beyene Girma; Hellevang, Helge & Kjemperud, Audun (2013). Formation of potentially porosity preserving grain coats in Brent and Dunlin age sandstones from the Northeastern North Sea area-A combined petrographic and hydrothermal synthesis study of samples from the Gjøa and Agat areas. Fulltekst i vitenarkiv
• Haile, Beyene Girma; Hellevang, Helge & Jahren, Jens (2018). Reservoir quality of the Upper Triassic to Lower Jurassic sediments, NW Barents Shelf: understanding porosity evolution through diagenesis and sedimentology. Universitetet i Oslo. Fulltekst i vitenarkiv Vis sammendrag

  This work presents a study on the interrelationship of burial diagenesis, depositional facies, the origin and distribution of diagenetic clay minerals, and diagenesis in sediment–sill sequences, as well as the thermal history evolution and their effect on reservoir quality distribution of the Upper Triassic to Lower Jurassic sequences on Svalbard. The study unequivocally demonstrates that there is systematic variability of diagenetic signatures as a function of depositional facies. Chlorite coating that inhibits porosity-occluding quartz cement is facies controlled. Sorting, grain size distribution and the clay fraction percentage exert a stronger control on the modes of occurrence of chlorite than on its abundance. This suggests that the best reservoir quality in a deltaic setting can be predicted with knowledge on the distribution of diagenetic signatures, specific depositional facies and sediment composition. Sedimentary basins containing igneous intrusions within sedimentary reservoir units represent an important degree of uncertainty in petroleum exploration. The intrusions obscure the normal burial diagenesis and thermal history of the basin. A new approach is employed in this study, coupling organic with inorganic paleotemperature proxies. The thermal history of a basin can then be accurately constrained. The method works well also in the important task of discriminating between sill-induced diagenesis and burial diagenesis. The findings of this study can be applicable for understanding and predicting reservoir quality distribution of the exploration target potential petroleum reservoir rocks in the subsurface.

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