Et profilbilde

Førsteamanuensis
Geir Nævdal { "honorific-suffix": "Førsteamanuensis", "fn": "Geir Nævdal", "tel": "", "email": "geir.nevdal@uis.no" }

Avdeling/enhet Det teknisk- naturvitenskapelige fakultet
Institutt/senter Institutt for energi- og petroleumsteknologi

Undervisning

Forskningsområder

Utvalgte publikasjoner

Pågående forskning

Arbeidserfaring

Vitenskapelige publikasjoner (fra CRISTin)

  • Eikrem, Kjersti Solberg; Nævdal, Geir; Jakobsen, Morten (2020). Iterative solution of the Lippmann-Schwinger equation in strongly scattering media by randomized construction of preconditioners. arxiv. 16 s.
  • Nævdal, Geir; Sævareid, Ove; Lundervold, Arvid (2017). New methodology for interpretation of dynamic contrast imaging data. International Research Institute of Stavanger. ISBN 978-82-490-0894-0.
  • Luo, Xiaodong; Chen, Yan; Valestrand, Randi; Stordal, Andreas S.; Lorentzen, Rolf; Nævdal, Geir (2014). On an Alternative Implementation of the Iterative Ensemble Smoother and its Application to Reservoir Facies Estimation. IRIS. 21 s.
  • Nævdal, Geir (2014). History matching a channelized reservoir: A distance function based approach. IRIS. 14 s.
  • Nævdal, Geir; Bakonyi, Mihaly (1998). The finite subsets of Z2 having the extension property. Georgia State University.
  • Nævdal, Geir; Bakonyi, Mihaly (1997). On the matrix completion method for multidimensional moment problems. Georgia State University. 14 s.
  • Hodneland, Erlend; Nævdal, Geir; Zanna, Antonella (2020). Nye metoder for distribuert og data-drevet simulering av blodstrøm i hjernen.
  • Lorentzen, Rolf Johan; Nævdal, Geir; Sævareid, Ove; Hodneland, Erlend (2020). Perfusion estimation using simulated contrast enhanced imaging data and porous media flow modeling. INRIA; 2020-08-24 - 2020-08-28.
  • Nævdal, Geir; Vinningland, Jan Ludvig (2020). Medical technology. NORCE Energi; 2020-01-28.
  • Chang, Yuqing; Lorentzen, Rolf Johan; Nævdal, Geir; Feng, Tao (2019). Olympus optimization under geological uncertainty. NORCE; 2019-06-03 - 2019-06-05.
  • Matt, Felix Nikolaus; Magnusson, Jan Olof; Nævdal, Geir; Winstral, Adam; Burkhart, John (2019). Improving long‐term hydropower inflow forecasts by assimilating snow data. Norwegian Hydrological Council; 2019-09-17 - 2019-09-19.
  • Bhakta, Tuhin; Luo, Xiaodong; Lorentzen, Rolf Johan; Nævdal, Geir; Valestrand, Randi (2018). Estimation of pressure-saturation and porosity fields from seismic acoustic impedance data using an ensemble based method. ConocoPhillips Norway; 2018-08-30.
  • Bhakta, Tuhin; Tolstukhin, Evgeny; Pacheco, Carlos; Luo, Xiaodong; Nævdal, Geir (2018). Petrophysical parameters inversion from seismic data using an ensemble-based method - A case study from a compacting reservoir. EAGE; 2018-09-03 - 2018-09-06.
  • Grana, Dario; Bhakta, Tuhin; Lorentzen, Rolf Johan; Valestrand, Randi; Nævdal, Geir (2018). Stochastic approaches to seismic reservoir characterization for improved modeling and prediction. The National IOR Centre of Norway; 2018-04-24 - 2018-04-25.
  • Huang, Xingguo; Jakobsen, Morten; Eikrem, Kjersti Solberg; Nævdal, Geir (2018). A target-oriented inversion of time-lapse seismic waveform data. University of California, Santa Cruz; 2018-07-19 - 2018-07-21.
  • Huang, Xingguo; Jakobsen, Morten; Eikrem, Kjersti Solberg; Nævdal, Geir (2018). A target-oriented scheme for efficient inversion of time-lapse seismic waveform data. 2018-10-15 - 2018-10-19.
  • Jakobsen, Morten; Eikrem, Kjersti Solberg; Nævdal, Geir; Huang, Xingguo (2018). Time-lapse full waveform inversion as a smart monitoring tool for future IOR. IOR Centre of Norway; 2018-04-24 - 2018-04-25.
  • Lorentzen, Rolf Johan; Bhakta, Tuhin; Grana, Dario; Luo, Xiaodong; Valestrand, Randi; Nævdal, Geir (2018). History Matching of Real Production and Seismic Data in the Norne Field. IEA;
  • Lorentzen, Rolf Johan; Bhakta, Tuhin; Grana, Dario; Luo, Xiaodong; Valestrand, Randi; Nævdal, Geir (2018). History Matching of Real Production and Seismic Data in the Norne Field. ConocoPhillips;
  • Lorentzen, Rolf Johan; Bhakta, Tuhin; Grana, Dario; Luo, Xiaodong; Valestrand, Randi; Nævdal, Geir; Sandø, Ivar (2018). History Matching Production and 4D Seismic Data in the Norne Field. NPD; 2018-11-28 - 2018-11-29.
  • Lorentzen, Rolf Johan; Bhakta, Tuhin; Grana, Dario; Luo, Xiaodong; Valestrand, Randi; Nævdal, Geir; Sandø, Ivar (2018). History matching real production and seismic data for the Norne field. 2018-05-28 - 2018-05-30.
  • Lorentzen, Rolf Johan; Chang, Yuqing; Nævdal, Geir; Feng, Tao (2018). Olympus Optimization under Geological Uncertainty. 2018-09-07.
  • Luo, Xiaodong; Bhakta, Tuhin; Evensen, Geir; Jakobsen, Morten; Lorentzen, Rolf Johan; Nævdal, Geir; Valestrand, Randi (2018). Big data assimilation and uncertainty quantification in 4D seismic history matching. 2018-04-23.
  • Luo, Xiaodong; Bhakta, Tuhin; Jacobsen, Morten B.; Nævdal, Geir (2018). Efficient big seismic data assimilation through sparse Representation. 2018-01-23.
  • Luo, Xiaodong; Bhakta, Tuhin; Nævdal, Geir (2018). Data driven adaptive localization for ensemble-based data assimilation problems. 2018-06-03 - 2018-06-07.
  • Nævdal, Geir (2018). 4d seismic and history matching - activities at the IOR center. Shell;
  • Nævdal, Geir (2018). Assimilering av snøinformasjon. Statkraft;
  • Nævdal, Geir (2018). The past and the future. IRIS og Uni CIPR; 2018-01-18.
  • Nævdal, Geir; Hodneland, Erlend; Sævareid, Ove (2018). Data assimilation for a multi-compartment model for blood flow in the brain - a progress report. 2018-06-20.
  • Nævdal, Geir; Hodneland, Erlend; Sævareid, Ove (2018). Data assimilation for a multi-compartment model for blood flow in the brain. IRIS, Uni Research & NERSC; 2018-05-28 - 2018-05-30.
  • Vinningland, Jan Ludvig; Valestrand, Randi; Hiorth, Aksel; Bjørnstad, Tor; Klöfkorn, Robert; Viig, Sissel Opsahl; Jettestuen, Espen; Skjæveland, Svein Magne; Zimmermann, Udo; Stavland, Arne; Nævdal, Geir; Madland, Merete Vadla (2018). The National IOR Centre of Norway. Innovation Norway; 2018-11-12 - 2018-11-14.
  • Bhakta, Tuhin; Luo, Xiaodong; Lorentzen, Rolf Johan; Nævdal, Geir (2017). Estimation of pressure-saturation and porosity fields from seismic acoustic impedance data using an ensemble based method. Society of Exploration Geophysicists;
  • Bhakta, Tuhin; Luo, Xiaodong; Nævdal, Geir (2017). Estimation of Pressure-Saturation and Porosity Fields from Seismic AVA Data Using an Ensemble Based Method. 2017-04-24 - 2017-04-27.
  • Eikrem, Kjersti Solberg; Jakobsen, Morten; Nævdal, Geir (2017). Bayesian Inversion of Time-lapse Seismic Waveform Data Using an Integral Equation Method. EAGE og the National IOR Centre of Norway; 2017-04-24 - 2017-04-27.
  • Luo, Xiaodong; Bhakta, Tuhin; Jakobsen, Morten; Nævdal, Geir (2017). Efficient big data assimilation through sparse representation. 2017-09-07.
  • Luo, Xiaodong; Bhakta, Tuhin; Jakobsen, Morten; Nævdal, Geir (2017). Efficient big data assimilation through sparse representation. 2017-09-11 - 2017-09-14.
  • Luo, Xiaodong; Bhakta, Tuhin; Jakobsen, Morten; Nævdal, Geir (2017). Efficient big seismic data assimilation through sparse representation. 2017-10-19 - 2017-10-20.
  • Luo, Xiaodong; Bhakta, Tuhin; Jakobsen, Morten; Nævdal, Geir (2017). Efficient big seismic data assimilation through sparse representation. 2017-01-31.
  • Luo, Xiaodong; Bhakta, Tuhin; Nævdal, Geir (2017). Data Driven Adaptive Localization With Applications To Ensemble-Based 4D Seismic History Matching. 2017-04-05.
  • Luo, Xiaodong; Bhakta, Tuhin; Nævdal, Geir (2017). Data driven adaptive localization with applications to ensemble-based 4D seismic history matching. 2017-06-12 - 2017-06-14.
  • Nævdal, Geir (2017). 4D seismic and history matching - activities at the IOR center. AkerBP;
  • Nævdal, Geir (2017). Perfusion estimation using ensemble based methods. 2017-08-22.
  • Nævdal, Geir; Matheson, Anders (2017). Value of 4D seismic history matching. Eni, Milano;
  • Bhakta, Tuhin; Luo, Xiaodong; Nævdal, Geir (2016). Ensemble based 4D seismic history matching using a sparse representation of AVA data. Society of Exploration Geophysicists; 2016-10-16 - 2016-10-21.
  • Holten, Terje; Luo, Xiaodong; Nævdal, Geir; Helwig, Stephen (2016). Time lapse CSEM reservoir monitoring of the Norne field with vertical dipoles. 2016-10-16 - 2016-10-21.
  • Hong, Aojie; Bratvold, Reidar Brumer; Nævdal, Geir (2016). Realistic Application of EnKFon Capacitance-Resistance Models. IRIS; 2016-06-20 - 2016-06-22.
  • Hong, Aojie; Bratvold, Reidar Brumer; Nævdal, Geir (2016). Robust Production Optimization with Capacitance-Resistance Model as Proxy. The National IOR Centre; 2016-04-14.
  • Hong, Aojie; Bratvold, Reidar Brumer; Nævdal, Geir (2016). Robust Production Optimization with Capacitance-Resistance Model as Precursor. EAGE; 2016-08-29 - 2016-09-01.
  • Hong, Aojie; Bratvold, Reidar Brumer; Nævdal, Geir (2016). Using a Capacitance-Resistance Model as Proxy for Fast Robust Production Optimization. The National IOR Centre; 2016-04-26 - 2016-04-27.
  • Luo, Xiaodong; Bhakta, Tuhin; Jakobsen, Morten; Nævdal, Geir (2016). AN ENSEMBLE 4D SEISMIC HISTORY MATCHING FRAMEWORK WITH SPARSE REPRESENTATION: A 3D BENCHMARK CASE STUDY. 2016-09-05 - 2016-09-09.
  • Luo, Xiaodong; Bhakta, Tuhin; Jakobsen, Morten; Nævdal, Geir (2016). An Ensemble 4D Seismic History Matching Framework with Sparse Representation Based on Wavelet Multiresolution Analysis. 2016-04-20.
  • Luo, Xiaodong; Bhakta, Tuhin; Jakobsen, Morten; Nævdal, Geir (2016). An Ensemble 4D Seismic History Matching Framework with Wavelet Multiresolution Analysis - A 3D Benchmark Case Study. EAGE; 2016-08-29 - 2016-09-01.
  • Luo, Xiaodong; Bhakta, Tuhin; Jakobsen, Morten; Nævdal, Geir (2016). Efficient big data assimilation through sparse representation: A case study in 4D seismic history matching. 2016-06-20 - 2016-06-22.
  • Luo, Xiaodong; Bhakta, Tuhin; Jakobsen, Morten; Nævdal, Geir (2016). Efficient big data assimilation through sparse representation: A case study in 4D seismic history matching. IRIS; 2016-04-28.
  • Mihai, Rodica; Nævdal, Geir (2016). What is going on at IRIS offices in the 8th floor?. Institutt for informatikk, Universitetet i Bergen;
  • Nævdal, Geir (2016). 4d seismic and history matching - activities at the IOR center. Eni; 2016-10-04 - 2016-10-05.
  • Nævdal, Geir (2016). Production optimization. Eni; 2016-10-04 - 2016-10-05.
  • Nævdal, Geir; Sævareid, Ove (2016). Data assimilation in medicine?. Høgskolen i Bergen; 2016-01-18 - 2016-01-19.
  • Nævdal, Geir; Sævareid, Ove (2016). New methodology for interpretation of dynamic contrast imaging data. Pumps and Pipes Norway;
  • Nævdal, Geir; Sævareid, Ove; Lorentzen, Rolf (2016). Data assimilation for a multi-compartment porous media model. MedViz, CMR, IRIS, Universitetet i Bergen; 2016-03-09.
  • Nævdal, Geir; Sævareid, Ove; Lorentzen, Rolf (2016). Data assimilation using MRI data. ECCOMAS; 2016-06-05 - 2016-06-10.
  • Nævdal, Geir; Sævareid, Ove; Lorentzen, Rolf (2016). Ensemble based data assimilation for a multi-compartment porous media model. IRIS together with NERSC, Uni Reserach CIPR and Statoil; 2016-06-20 - 2016-06-22.
  • Nævdal, Geir; Sævareid, Ove; Lorentzen, Rolf (2016). From oil to medicine. MedViz; 2016-03-04.
  • Nævdal, Geir (2015). Reservoir characterization using ensemble based methods. The National IOR Centre of Norway; 2015-04-28 - 2015-04-29.
  • Nævdal, Geir; Eikrem, Kjersti Solberg (2015). Ensemble based 4-d seismic history matching. UNI CIPR; 2015-02-12.
  • Nævdal, Geir; Eikrem, Kjersti Solberg; Jakobsen, Morten; Chen, Yan (2015). Ensemble based reservoir characterization using seismic and production data. Society of Industrial and Applied Mathematics; 2015-06-29 - 2015-07-02.
  • Stordal, Andreas S.; Nævdal, Geir (2015). (Towards a) Generalized Randomized Maximum Likelihood. Society of Industrial and Applied Mathematics; 2015-06-29 - 2015-07-02.
  • Stordal, Andreas S.; Nævdal, Geir (2015). Generalized Randomized Maximum Likelihood. TU Delft and TNO; 2015-11-11 - 2015-11-12.
  • Flornes, Kristin Margrethe; Madland, Merete Vadla; Hiorth, Aksel; Nævdal, Geir; Skjæveland, Svein Magne (2014). The National IOR Centre of Norway - Technical program. COREC; 2014-06-10 - 2014-06-11.
  • Hiorth, Aksel; Nævdal, Geir (2014). Research focus in the National IOR Centre and potential collaborative projects with SINTEF-Petroleum. SINTEF;
  • Luo, Xiaodong; Chen, Yan; Valestrand, Randi; Stordal, Andreas S.; Lorentzen, Rolf; Nævdal, Geir (2014). On an Alternative Implementation of the Iterative Ensemble Smoother and its Application to Reservoir Facies Estimation. EAGE; 2014-09-08 - 2014-09-11.
  • Luo, Xiaodong; Chen, Yan; Valestrand, Randi; Stordal, Andreas S.; Lorentzen, Rolf; Nævdal, Geir (2014). On an alternative implementation of the iterative ensemble smoother and its application to a reservoir facies estimation problem. IRIS; 2014-06-23 - 2014-06-25.
  • Luo, Xiaodong; Chen, Yan; Valestrand, Randi; Stordal, Andreas S.; Lorentzen, Rolf; Nævdal, Geir (2014). On an alternative implementation of the iterative ensemble smoother and its application to a reservoir facies estimation problem. 2014-06-10 - 2014-06-13.
  • Luo, Xiaodong; Chen, Yan; Valestrand, Randi; Stordal, Andreas S.; Lorentzen, Rolf; Nævdal, Geir (2014). On an iterative ensemble smoother and its application to a reservoir facies estimation problem. 2014-09-08 - 2014-09-11.
  • Luo, Xiaodong; Chen, Yan; Valestrand, Randi; Stordal, Andreas S.; Lorentzen, Rolf; Nævdal, Geir (2014). On an iterative ensemble smoother and its application to a reservoir facies estimation problem. 2014-04-27 - 2014-05-02.
  • Luo, Xiaodong; Lorentzen, Rolf; Stordal, Andreas S.; Nævdal, Geir (2014). Toward an Enhanced Bayesian Estimation Framework for Multiphase Flow Soft-sensing. EAGE; 2014-09-08 - 2014-09-11.
  • Madland, Merete Vadla; Hiort, Aksel; Nævdal, Geir (2014). The National IOR Centre of Norway. ConocoPhillips;
  • Madland, Merete Vadla; Hiorth, Aksel; Nævdal, Geir (2014). Status R&D activities, theme 1 and 2. The National IOR Centre of Norway; 2014-09-22.
  • Madland, Merete Vadla; Hiorth, Aksel; Nævdal, Geir (2014). The National IOR Centre of Norway. The National IOR Centre of Norway; 2014-04-10.
  • Madland, Merete Vadla; Hiorth, Aksel; Nævdal, Geir (2014). The National IOR Centre of Norway. The National IOR Centre of Norway; 2014-11-10.
  • Madland, Merete Vadla; Hiorth, Aksel; Nævdal, Geir (2014). The R&D Activities, Theme 1 and 2. The National IOR Centre of Norway; 2014-06-19.
  • Nævdal, Geir (2014). Introduction to the methodology used in the field study. IRIS; 2014-12-02 - 2014-12-03.
  • Nævdal, Geir; Eikrem, Kjersti Solberg; Stordal, Andreas S. (2014). Ensemble based methods for estimation and optimization. 2014-11-12 - 2014-11-14.
  • Stordal, Andreas S.; Nævdal, Geir; Valestrand, Randi; Karlsen, Hans A (2014). Gaussian Mixtures in data assimilation problems. 2014-06-10 - 2014-06-13.
  • Luo, Xiaodong; Chen, Yan; Valestrand, Randi; Lorentzen, Rolf Johan; Stordal, Andreas S.; Nævdal, Geir (2012). An alternative implementation of the iterative ensemble smoother and some numerical results. IRIS; 2012-12-10 - 2012-12-11.
  • Valestrand, Randi; Nævdal, Geir; Shafieirad, Ali; Stordal, Andreas S.; Dovera, Laura (2012). Refined Adaptive Gaussian Mixture Filter - Application on a Real Field Case. EAGE and SPE; 2012-06-04 - 2012-06-07.
  • Valestrand, Randi; Nævdal, Geir; Stordal, Andreas S. (2012). Application of the Adaptive Gaussian Mixture Filter to History Match a Real Field Case. EAGE; 2012-09-10 - 2012-09-13.
  • Nævdal, Geir; Hanea, Remus G.; Oliver, Dean S.; Vallès, Brice (2011). Ensemble Kalman filter for model updating - A special issue.
  • Kovalenko, Andrey; Mannseth, Trond; Nævdal, Geir (2010). Error distribution for ensemble Kalman filter update. 2010-07-05 - 2010-07-08.
  • Kovalenko, Andrey; Mannseth, Trond; Nævdal, Geir (2010). Error estimate for the ensemble Kalman filter analysis step. CIPR; 2010-05-10 - 2010-05-11.
  • Kovalenko, Andrey; Mannseth, Trond; Nævdal, Geir (2010). Error estimate for the ensemble Kalman filter update step. 2010-09-06 - 2010-09-09.
  • Lorentzen, Rolf; Flornes, Kristin Margrethe; Nævdal, Geir (2009). History Matching Channelized Reservoirs Using the Ensemble Kalman Filter. International Petroleum Technology Conference; 2009-12-07 - 2009-12-09.
  • Nygaard, Olav Gerhard Hauken; Vefring, Erlend H; Fjelde, Kjell Kåre; Nævdal, Geir; Lorentzen, Rolf Johan; Mylvaganam, Saba (2004). Bottomhole pressure control during pipe connection in gas-dominant wells. 2004-10-11.
  • Nygaard, Olav Gerhard Hauken; Vefring, Erlend H; Mylvaganam, Saba; Lorentzen, Rolf Johan; Nævdal, Geir; Fjelde, Kjell Kåre (2004). Underbalanced drilling : improving pipe connection procedures using automatic control. 2004-09-26.
  • Vefring, Erlend H; Lorentzen, Rolf Johan; Nævdal, Geir; Fjelde, Kjell Kåre; Nygaard, Olav Gerhard Hauken (2003). Reservoir characterization during UBD : methodology and active tests. 2003-03-25 - 2003-03-26.
  • Vefring, Erlend H; Fjelde, Kjell Kåre; Lorentzen, Rolf Johan; Nygaard, Olav Gerhard Hauken; Nævdal, Geir; Merlo, Antonino (2002). Reservoir characterization during underbalanced drilling : methodology,accuracy, and necessary data. 2002-09-29 - 2002-10-02.
  • Nævdal, Geir; Johnson, Charles R. (2001). The probability that a (partial) matrix is positive semidefinite.
  • Thorsen, Inge; Ubøe, Jan; Nævdal, Geir (1997). A network approach to commuting.