Hvor kommer sanden i verdens største delta fra? Hvordan kan vite det hvor den kommer fra? Dette er sentrale spørsmål for Trond Svånå Harstad i arbeidet med sin nylig avlagte doktorgrad «Single-mineral provenance method development with a case study from the Late Traissc Barents Shelf», ved NTNU, institutt for geovitenskap og petroleum.
I avhandlingen har han studert mineraler i sandsteiner fra det enorme deltaet som utgjør Snadd og De Geerdalen formasjonene av Midt- og Sentrias alder, i Barentshavet og på Svalbard. Harstad har utviklet/videreutviklet to metoder for bedre å identifisere kilden til sanden, en metode basert på mineralet Cr-spinel og en metode basert på formene til mineralet zirkon. Han forteller at Cr-spinel viste å være et veldig godt egnet mineral til å identifisere forskjellen på bergarter, da de har helt ulik kjemi. For å gjenkjenne og klassifisere formen på zirkonkorn i fotografier brukte han kunstig intelligens, en innfallsvinkel som er ny innen dette fagfeltet. Arbeidet ble utført som et samarbeid mellom NTNU og Norges Geologiske Undersøkelse (NGU), mens feltarbeidet og prøveinnsamlingen ble gjort i samarbeid med Petroleumsdirektoratet og Sintef.
Og hvor kommer sanden fra? I begynnelsen av deltaet kommer mesteparten av sanden fra Uralfjellenes forløper Uralidene. På slutten av avsettingshistorien er Taimyrhalvøya i det nordlige Sibir sannsynligvis kilden for mesteparten av sanden.
Carlos Alberto Aizprua Luna has successfully defended his PhD thesis at the Department of Geoscience and Petroleum. The title of the academic thesis was: «Forearc crustal structure and controlling factors on basin formation across the southernmost Northern Andes»
The assessment committee consisted of Professor Atle Rotevatn, University of Bergen, Norway, Professor Christine Authemayou, University Occidentale de Bretagne, France, Dr. Atsushi Noda, Geological Survey of Japan, Senior Geophysicist Fausto Ferraccioli, British Antarctic Survey, UK, Professor Nicolas Tribovillard, University of Lille, France, Professor Børge Arntsen, NTNU, Norway
Professor Børge Arntsen and Professor Nicolas Tribovillard was Administrators of the Committee.
Professor Ståle Emile Johansen, Department of Geoscience and Petroleum, has been the candidate’s main supervisor. Professor Jean-Yves Reynard, University of Lille, has been the candidate’s co-supervisor.
Umed Kakhkhorov started his PhD at Department of Geoscience and Petroleum . Umed is going to investigate inverse method for ocean bottom seismic data, with focus on elastic Full Waveform Inversion. The objective of the research is to develop and explore high resolution crustal-scale P-wave (Vp) and S-wave (Vs) velocity model building and anisotropy analyses. Developing inversion methods for Vs and other elastic properties provide essential data in solving questions related to fluid flow and pore pressure in subduction zones. The main supervisor is Børge Arntsen (NTNU) and co-supervisors are Espen Birger Raknes (NTNU, AkerBP) and Wiktor Waldemar Weibull (UiS).
Umed is a group member of Geophysics and Applied Mathematics in Exploration and Safe production (#GAMES) project.
Umed has a master degree in geoscience engineering from University of Stavanger.
In August, Jiaxin Yu joined the Department of Geoscience and Petroleum at Norwegian University of Science and Technology (NTNU).
Her supervisors are Kenneth Duffault and Per Avseth. Jiaxin is going to work on estimating the timing and magnitude of net exhumation in Norwegian offshore Norwegian using compaction based techniques from geophysical and well data. one of her jobs is to model the stress sensitivity of seismic waves as well as temperature and salinity dependencies of resistivity so that they could be compensated for constructing normal compaction trends from geophysical data. The whole modeling framework will be integrated into a statistical framework for uncertainty analysis. Automating the estimation procedure in an exploration area by means of different regression and pattern recognition methods will also be investigated.
Jiaxin is a group member of GAMES project aiming to develop innovative methods for exploration and safe production of hydrocarbon resources in offshore Noway.
Jiaxin got her Master’s Degree in Applied Geoscience from RWTH-Aachen Germany in March this year. Applying Machine learning methods in Geoscience and Geophysics research is her interest.
The Life of a PhD is varied, but sometimes you maybe need a bigger change – You may need to be in an environment where you need to carry a rifle in case of polar bear attacks? Read the NTNU TechZone blog about Eric Ryans five weeks adventure on Svalbard here
Do you want to work with us? A three-year PhD scholarship is available in the LowEmission research centre for petroleum activities. Read more and apply here
Friday April 5.th, Solveig Vassenden defended her thesis. Vassenden has submitted the following academic thesis as a part of the doctoral work at The Norwegian University of Science and Technology (NTNU), Department of geoscience and Petroleum «Rock Breaking under Rolling TBM Disc Cutters in Hard Rock Conditions – Visualization and documentation of cracks»
The Faculty had appointed the following Assessment Committee to assess the thesis:
- Professor Robert Galler, Montanuniversität Leoben, Austria (1.opponent)
- Director Guro Grøneng, Norwegian Geotechnical Institute (2.opponent)
- Professor II Roger Olsson, NTNU
Professor II Roger Olsson, Department of Geoscience and Petroleum, was the Administrator of the Committee.
The Committee recommended that the thesis is worthy of being publicly defended for the PhD degree.
The doctoral work has been carried out at the Department of Geoscience and Petroleum.
The trial lecture took place on April 5th 2019 at Hovedbygget, Gløshaugen on the following prescribed subject:
“Selection criteria for conventional tunneling”
The public defence of the thesis took place on April 5th 2019 atHovedbygget, Gløshaugen.
Professor Eivind Grøv, Department of Geoscience and Petroleum, has been the candidate’s main supervisor. Professor Charlie Chunlin Li, Department of Geoscience and Petroleum has been the candidate’s co-supervisor.