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1

Bridging the ensemble Kalman filter and particle filters: the adaptive Gaussian mixture filter

Andreas S. Stordal, Hans A. Karlsen, Geir Nævdal, Hans J. Skaug, Brice Vallès

Journal:

Computational Geosciences

Year:

2011

Language:

english

File:

PDF, 419 KB

english, 2011

2

Iterated extended Kalman filter method for time‐lapse seismic full waveform inversion

Eikrem, Kjersti Solberg, Nævdal, Geir, Jakobsen, Morten

Journal:

Geophysical Prospecting

Year:

2018

Language:

english

File:

PDF, 2.71 MB

english, 2018

3

Simultaneous determination of absolute and relative permeabilities

Randi Valestrand, Alv-Arne Grimstad, Kristofer Kolltveit, Geir Nævdal, Jan-Erik Nordtvedt

Journal:

International Journal of Thermal Sciences

Year:

2002

Language:

english

File:

PDF, 228 KB

english, 2002

4

Updating Markov chain models using the ensemble Kalman filter

Dean S. Oliver, Yan Chen, Geir Nævdal

Journal:

Computational Geosciences

Year:

2011

Language:

english

File:

PDF, 698 KB

english, 2011

5

Comparing the adaptive Gaussian mixture filter with the ensemble Kalman filter on synthetic reservoir models

Andreas S. Stordal, Randi Valestrand, Hans Arnfinn Karlsen, Geir Nævdal, Hans Julius Skaug

Journal:

Computational Geosciences

Year:

2012

Language:

english

File:

PDF, 2.34 MB

english, 2012

6

Interactions between natural and farmed fish populations: information from genetic markers

Øystein Skaala, Geir Dahle, Knut E. Jørstad, Gunnar Nævdal

Journal:

Year:

1990

Language:

english

File:

PDF, 72 KB

english, 1990

7

The Ensemble Kalman Filter in Reservoir Engineering--a Review

Aanonsen, Sigurd I., Nævdal, Geir, Oliver, Dean S., Reynolds, Albert C., Vallès, Brice

Journal:

Year:

2009

Language:

english

File:

PDF, 587 KB

english, 2009

8

[Society of Petroleum Engineers SPE/IADC Drilling Conference - Amsterdam, Netherlands (2001-02-27)] SPE/IADC Drilling Conference - Underbalanced Drilling: Real Time Data Interpretation and Decision Support

Lorentzen, Rolf J., Fjelde, Kjell Kåre, Frøyen, Johnny, Lage, Antonio C.V.M., Nævdal, Geir, Vefring, Erlend H.

Language:

english

File:

PDF, 583 KB

english

9

Simultaneous assimilation of production and seismic data: application to the Norne field

Lorentzen, Rolf J., Bhakta, Tuhin, Grana, Dario, Luo, Xiaodong, Valestrand, Randi, Nævdal, Geir

Journal:

Computational Geosciences

Year:

2019

Language:

english

File:

PDF, 3.40 MB

english, 2019

10

Nonlinear model predictive control scheme for stabilizing annulus pressure during oil well drilling

Gerhard Nygaard, Geir Nævdal

Journal:

Journal of Process Control

Year:

2006

Language:

english

File:

PDF, 454 KB

english, 2006

11

On a generalization of the trigonometric moment problem

Journal:

Linear Algebra and its Applications

Year:

1997

Language:

english

File:

PDF, 529 KB

english, 1997

12

Waterflooding using closed-loop control

Geir Nævdal, D. Roald Brouwer, Jan-Dirk Jansen

Journal:

Computational Geosciences

Year:

2006

Language:

english

File:

PDF, 916 KB

english, 2006

13

Ensemble Kalman filter for model updating – A special issue

Geir Nævdal, Remus G. Hanea, Dean S. Oliver, Brice Vallès

Journal:

Computational Geosciences

Year:

2011

Language:

english

File:

PDF, 124 KB

english, 2011

14

Sampling error distribution for the ensemble Kalman filter update step

Andrey Kovalenko, Trond Mannseth, Geir Nævdal

Journal:

Computational Geosciences

Year:

2012

Language:

english

File:

PDF, 434 KB

english, 2012

15

Partial matrix contractions and intersections of matrix balls

Geir Nævdal, Hugo J. Woerdeman

Journal:

Linear Algebra and its Applications

Year:

1992

Language:

english

File:

PDF, 606 KB

english, 1992

16

MODELING SPATIAL STRUCTURES THROUGH EQUILIBRIUM STATES FOR TRANSITION MATRICES

Geir Nævdal, Inge Thorsen, Jan Ubøe

Journal:

Journal of Regional Science

Year:

1996

Language:

english

File:

PDF, 1.32 MB

english, 1996

17

Adaptive Multiscale Permeability Estimation

Alv-Arne Grimstad, Trond Mannseth, Geir Nævdal, Hege Urkedal

Journal:

Computational Geosciences

Year:

2003

Language:

english

File:

PDF, 1.19 MB

english, 2003

18

Efficient workflow for optimizing well controls

Masoud Asadollahi, Geir Nævdal, Ali Shafieirad

Journal:

Journal of Petroleum Science and Engineering

Year:

2012

Language:

english

File:

PDF, 621 KB

english, 2012

19

Filtering with state space localized Kalman gain

Andreas S. Stordal, Hans A. Karlsen, Geir Nævdal, Dean S. Oliver, Hans J. Skaug

Journal:

Physica D: Nonlinear Phenomena

Year:

2012

Language:

english

File:

PDF, 1.94 MB

english, 2012

20

Genetic Variation in the Hooded Seal, Cystophora Cristata, Based on Enzyme Polymorphism and Multi-Locus DNA Fingerprinting

Rolf C. Sundt, Geir Dahle, Gunnar Nævdal

Journal:

Year:

1994

Language:

english

File:

PDF, 718 KB

english, 1994

21

A Comment on Parrott’s Theorem

Journal:

SIAM Journal on Numerical Analysis

Year:

1991

Language:

english

File:

PDF, 420 KB

english, 1991

22

Error Estimate for the Ensemble Kalman Filter Analysis Step

Kovalenko, Andrey, Mannseth, Trond, Nævdal, Geir

Journal:

SIAM Journal on Matrix Analysis and Applications

Year:

2011

Language:

english

File:

PDF, 555 KB

english, 2011

23

On the Completion of Partially Given Triangular Toeplitz Matrices to Contractions

Journal:

SIAM Journal on Matrix Analysis and Applications

Year:

1993

Language:

english

File:

PDF, 642 KB

english, 1993

24

Cone Inclusion Numbers

Nævdal, Geir, Woerdeman, Hugo J.

Journal:

SIAM Journal on Matrix Analysis and Applications

Year:

1998

Language:

english

File:

PDF, 254 KB

english, 1998

25

Production optimization using derivative free methods applied to Brugge field case

Asadollahi, Masoud, Nævdal, Geir, Dadashpour, Mohsen, Kleppe, Jon

Journal:

Journal of Petroleum Science and Engineering

Year:

2014

Language:

english

File:

PDF, 5.52 MB

english, 2014

26

Quantifying Monte Carlo Uncertainty in the Ensemble Kalman Filter

Nævdal, Geir, Thulin, Kristian, Skaug, Hans Julius, Aanonsen, Sigurd Ivar

Journal:

Year:

2011

Language:

english

File:

PDF, 1.22 MB

english, 2011

27

Toward an enhanced Bayesian estimation framework for multiphase flow soft-sensing

Luo, Xiaodong, Lorentzen, Rolf J, Stordal, Andreas S, Nævdal, Geir

Journal:

Inverse Problems

Year:

2014

Language:

english

File:

PDF, 1.32 MB

english, 2014

28

Estimating Facies Fields by Use of the Ensemble Kalman Filter and Distance Functions--Applied to Shallow-Marine Environments

Lorentzen, Rolf J., Nævdal, Geir, Shafieirad, Ali

Journal:

Year:

2013

Language:

english

File:

PDF, 2.37 MB

english, 2013

29

Multiscale estimation with spline wavelets, with application to two-phase porous-media flow

Nævdal, Geir, Mannseth, Trond, Brusdal, Kari, Nordtvedt, Jan-Erik

Journal:

Inverse Problems

Year:

2000

Language:

english

File:

PDF, 235 KB

english, 2000

30

[Society of Petroleum Engineers SPE Annual Technical Conference and Exhibition - San Antonio, Texas (2002-09-29)] SPE Annual Technical Conference and Exhibition - Reservoir Characterization during Underbalanced Drilling: Methodology, Accuracy, and Necessary Data

Vefring, Erlend H., Nygaard, Gerhard, Fjelde, Kjell Kåre, Lorentzen, Rolf Johan, Nævdal, Geir, Merlo, Antonino

Language:

english

File:

PDF, 484 KB

english

31

[Society of Petroleum Engineers SPE Annual Technical Conference and Exhibition - New Orleans, Louisiana (2001-09-30)] SPE Annual Technical Conference and Exhibition - Underbalanced and Low-head Drilling Operations: Real Time Interpretation of Measured Data and Operational Support

Lorentzen, Rolf J., Fjelde, Kjell Kåre, Frøyen, Jonny, Lage, Antonio C.V.M., Nævdal, Geir, Vefring, Erlend H.

Language:

english

File:

PDF, 551 KB

english

32

[Society of Petroleum Engineers SPE Annual Technical Conference and Exhibition - (2001.09.30-2001.10.3)] Proceedings of SPE Annual Technical Conference and Exhibition - Underbalanced and Low-head Drilling Operations: Real Time Interpretation of Measured Data and Operational Support

Lorentzen, Rolf, Fjelde, Kjell, Jonny, Frøyen, Lage, Antonio, Geir, Nævdal, Vefring, Erlend

Year:

2001

Language:

english

File:

PDF, 551 KB

english, 2001

33

History Matching Channelized Reservoirs Using the Ensemble Kalman Filter

Lorentzen, Rolf J., Flornes, Kristin M., Nævdal, Geir

Journal:

Year:

2012

Language:

english

File:

PDF, 2.80 MB

english, 2012

34

[Society of Petroleum Engineers IADC/SPE Underbalanced Technology Conference and Exhibition - Houston, Texas (2003-03-25)] IADC/SPE Underbalanced Technology Conference and Exhibition - Reservoir Characterization during UBD: Methodology and Active Tests

Vefring, Erlend H., Nygaard, Gerhard, Lorentzen, Rolf Johan, Nævdal, Geir, Fjelde, Kjell Kåre

Language:

english

File:

PDF, 1.07 MB

english

35

[Society of Petroleum Engineers IADC/SPE Underbalanced Technology Conference and Exhibition - (2003.03.25-2003.03.26)] Proceedings of IADC/SPE Underbalanced Technology Conference and Exhibition - Reservoir Characterization During UBD: Methodology and Active Tests

Vefring, Erlend, Gerhard, Nygaard, Lorentzen, Rolf, Geir, Nævdal, Fjelde, Kjell

Year:

2003

Language:

english

File:

PDF, 1.07 MB

english, 2003

36

[Society of Petroleum Engineers SPE Annual Technical Conference and Exhibition - Denver, Colorado (2003-10-05)] SPE Annual Technical Conference and Exhibition - Reservoir Monitoring and Continuous Model Updating Using Ensemble Kalman Filter

Geir, Nævdal, Johnsen, Liv Merethe, Aanonsen, Sigurd Ivar, Vefring, Erlend H.

Language:

english

File:

PDF, 1.71 MB

english

37

Estimation of Production Rates With Transient Well-Flow Modeling and the Auxiliary Particle Filter

Lorentzen, Rolf J., Stordal, Andreas, Nævdal, Geir, Karlsen, Hans A., Skaug, Hans J.

Journal:

Year:

2014

Language:

english

File:

PDF, 474 KB

english, 2014

38

[Society of Petroleum Engineers SPE/IADC Underbalanced Technology Conference and Exhibition - Houston, Texas (2004-10-11)] SPE/IADC Underbalanced Technology Conference and Exhibition - Bottomhole Pressure Control During Pipe Connection in Gas-Dominant Wells

Nygaard, Gerhard H., Vefring, Erlend H., Fjelde, Kjell Kåre, Nævdal, Geir, Lorentzen, Rolf Johan, Mylvaganam, Saba

Language:

english

File:

PDF, 560 KB

english

39

[Society of Petroleum Engineers SPE/IADC Drilling Conference - (2001.02.27-2001.03.1)] Proceedings of SPE/IADC Drilling Conference - Underbalanced Drilling: Real Time Data Interpretation and Decision Support

Lorentzen, Rolf, Fjelde, Kjell, Johnny, Frøyen, Lage, Antonio, Geir, Nævdal, Vefring, Erlend

Year:

2001

Language:

english

File:

PDF, 583 KB

english, 2001

40

[Society of Petroleum Engineers SPE Annual Technical Conference and Exhibition - (2003.10.5-2003.10.8)] Proceedings of SPE Annual Technical Conference and Exhibition - Reservoir Monitoring and Continuous Model Updating Using Ensemble Kalman Filter

Geir, Nævdal, Johnsen, Liv, Aanonsen, Sigurd, Vefring, Erlend

Year:

2003

Language:

english

File:

PDF, 1.71 MB

english, 2003

41

The Effect of Including Tracer Data in the Ensemble-Kalman-Filter Approach

Valestrand, Randi, Sagen, Jan, Nævdal, Geir, Huseby, Olaf K.

Journal:

Year:

2010

Language:

english

File:

PDF, 2.03 MB

english, 2010

42

[Society of Petroleum Engineers SPE/IADC Underbalanced Technology Conference and Exhibition - (2004.10.11-2004.10.12)] Proceedings of SPE/IADC Underbalanced Technology Conference and Exhibition - Bottomhole Pressure Control During Pipe Connection in Gas-Dominant Wells

Nygaard, Gerhard, Vefring, Erlend, Fjelde, Kjell, Geir, Nævdal, Lorentzen, Rolf, Saba, Mylvaganam

Year:

2004

Language:

english

File:

PDF, 560 KB

english, 2004

43

Natural and Conventional Tracers for Improving Reservoir Models Using the EnKF Approach

Huseby, Olaf, Valestrand, Randi, Nævdal, Geir, Sagen, Jan

Journal:

Year:

2010

Language:

english

File:

PDF, 1.72 MB

english, 2010

44

[Society of Petroleum Engineers SPE Annual Technical Conference and Exhibition - (2002.09.29-2002.10.2)] Proceedings of SPE Annual Technical Conference and Exhibition - Reservoir Characterization during Underbalanced Drilling: Methodology, Accuracy, and Necessary Data

Vefring, Erlend, Gerhard, Nygaard, Fjelde, Kjell, Lorentzen, Rolf, Geir, Nævdal, Antonino, Merlo

Year:

2002

Language:

english

File:

PDF, 484 KB

english, 2002

45

Bayesian estimation of reservoir properties—effects of uncertainty quantification of 4D seismic data

Eikrem, Kjersti Solberg, Nævdal, Geir, Jakobsen, Morten, Chen, Yan

Journal:

Computational Geosciences

Year:

2016

Language:

english

File:

PDF, 2.98 MB

english, 2016

46

[Society of Exploration Geophysicists SEG Technical Program Expanded Abstracts 2016 - Dallas, Texas (16 October to 21 October)] SEG Technical Program Expanded Abstracts 2016 - Ensemble based 4D seismic history matching using a sparse representation of AVA data

Bhakta, Tuhin, Luo, Xiaodong, Nævdal, Geir

Language:

english

File:

PDF, 2.31 MB

english

47

[Society of Exploration Geophysicists SEG Technical Program Expanded Abstracts 2017 - Houston, Texas (24 September to 29 September)] SEG Technical Program Expanded Abstracts 2017 - Estimation of pressure-saturation and porosity fields from seismic acoustic impedance data using an ensemble-based method

Bhakta, Tuhin, Luo, Xiaodong, Lorentzen, Rolf, Nævdal, Geir

Language:

english

File:

PDF, 2.43 MB

english

48

Efficient big data assimilation through sparse representation: A 3D benchmark case study in petroleum engineering

Luo, Xiaodong, Bhakta, Tuhin, Jakobsen, Morten, Nævdal, Geir, Mueck, Leonie Anna

Journal:

Year:

2018

Language:

english

File:

PDF, 4.88 MB

english, 2018

49

Positive bases with maximal cosine measure

Journal:

Optimization Letters

Year:

2018

Language:

english

File:

PDF, 404 KB

english, 2018

50

A new framework for assessing subject-specific whole brain circulation and perfusion using MRI-based measurements and a multi-scale continuous flow model

Hodneland, Erlend, Hanson, Erik, Sævareid, Ove, Nævdal, Geir, Lundervold, Arvid, Šoltészová, Veronika, Munthe-Kaas, Antonella Z., Deistung, Andreas, Reichenbach, Jürgen R., Nordbotten, Jan M., Marsden

Journal:

PLoS Computational Biology

Year:

2019

Language:

english

File:

PDF, 6.02 MB

english, 2019

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