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Proceedings Papers

Paper presented at the SPE Asia Pacific Oil & Gas Conference and Exhibition, November 17–19, 2020
Paper Number: SPE-202216-MS
.... On the other hand, ES-MDA does not exceed the number of initial ensembles in each iteration regardless of the number of iterations. This paper presents an automated workflow that leads to multiple reliable history matched simulation models. All of the generated models are geologically consistent and...
Journal Articles
Journal of Petroleum Technology 69 (04): 93–94.
Paper Number: SPE-0417-0093-JPT
Published: 01 April 2017
... of iterations to converge and, thus, becomes computationally prohibitive for large-scale models. An approach was later proposed to improve the performance of the ES by assimilating the same data sets multiple times. In this iterative ES procedure, the measurement-error covariance matrix is inflated...
Journal Articles
Journal: SPE Journal
SPE Journal (2020)
Paper Number: SPE-203847-PA
Published: 05 October 2020
... and porosity relating to both seismic and EM attributes, are estimated by joint inversion of seismic and EM data using an iterative ensemble smoother (ES). Second, the remaining model parameters of interest, such as permeability, are calibrated using the updated cross-properties. To assimilate the...
Proceedings Papers

Paper presented at the The 29th International Ocean and Polar Engineering Conference, June 16–21, 2019
Paper Number: ISOPE-I-19-280
... quickly calculated by the program script that edited by python. The program adopted the "Double Multiple Stream Tube (DMST)" model, which is based on the "Blade Element Momentum" (BEM) theory with NACA0015 chosen as the type of the airfoil. Then, the Evolutionary Strategy (ES) as well as the Covariance...
Journal Articles
Journal: SPE Journal
SPE Journal (2021)
Paper Number: SPE-205340-PA
Published: 22 February 2021
... the latent variables as optimization variables. The performance of the DSAE with fewer activating nodes is excellent because it reduces the redundant information of the input and avoids overfitting. Then, we adopt the ensemble smoother (ES) with multiple data assimilation (ES-MDA) to solve this...
Journal Articles
Journal: SPE Journal
SPE Journal 21 (06): 2195–2207.
Paper Number: SPE-173214-PA
Published: 14 December 2016
...Duc H. Le; Alexandre A. Emerick; Albert C. Reynolds Summary Recently, Emerick and Reynolds ( 2012 ) introduced the ensemble smoother with multiple data assimilations (ES-MDA) for assisted history matching. With computational examples, they demonstrated that ES-MDA provides both a better data match...
Proceedings Papers

Paper presented at the SPE Middle East Oil and Gas Show and Conference, March 18–21, 2019
Paper Number: SPE-194751-MS
... integrating the results in Reservoir simulation using the equation of state. Model calibration is achieved with the Ensemble Smoother with Multiple Data Assimilation (ES-MDA). Further, we then optimise the calibrated model, focusing on Enhanced Oil recovery technique, with steam injection, utilising the...
Proceedings Papers

Paper presented at the SPE Reservoir Simulation Symposium, February 23–25, 2015
Paper Number: SPE-173233-MS
... mathematically written as (5) f ( ( m , F ) | D ) = f ( F | ( m , D ) ) f ( m | D ) . Based on this reasoning, we propose a procedure where ES-MDA is used to calculate f ( m | D ). This is an iterative procedure that consists of multiple...
Proceedings Papers

Paper presented at the SPE Reservoir Simulation Symposium, February 18–20, 2013
Paper Number: SPE-163675-MS
..., we introduced in Emerick and Reynolds (2012b) the ES-MDA method. With ES-MDA, we assimilate the same set of data multiple times with an inflated covariance matrix of the measurement errors. The inflation coefficients are selected such that the equivalence between single and multiple data...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 9–11, 2017
Paper Number: SPE-189298-STU
... 2009 ; Seiler et al. 2001 ). Throughout the years, KF has been gradually improved, aiming to deal with more complex cases. Among several improvements, Ensemble Smoother with Multiple Data Assimilation (ES-MDA), proposed by Emerick and Reynolds (2013) , can be highlighted once it is a new approach...
Proceedings Papers

Paper presented at the SPE Reservoir Simulation Symposium, February 23–25, 2015
Paper Number: SPE-173214-MS
... approximation (14) g ( m ) ≈ g ( m l ) + G l ( m − m l ) = g ( m l ) + G l δ m l + 1 , Abstract Recently, Emerick and Reynolds introduced the ensemble smoother with multiple data assimilations (ES-MDA) for assisted history matching. Via...
Journal Articles
Journal: SPE Journal
SPE Journal (2021)
Paper Number: SPE-205029-PA
Published: 10 February 2021
... some of the real-field challenges. We compare the results with reference solutions and with the known ensemble smoother with multiple data assimilation (ES-MDA) using Kalman gain distance-based localization. The results show that our method can efficiently assimilate time-lapse seismic data, leading to...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, September 30–October 2, 2019
Paper Number: SPE-195837-MS
... technique. Three probabilistic history matching techniques commonly practiced in the industry are discussed. These are Design-of-Experiment (DoE) with rejection sampling from proxy, Ensemble Smoother (ES) and Genetic Algorithm (GA). The model used for this study is an offshore waterflood field in Gulf-of...
Journal Articles
Journal: SPE Journal
SPE Journal 25 (06): 3317–3331.
Paper Number: SPE-201106-PA
Published: 17 December 2020
... ensemble smoother (ES). 12 10 2019 22 1 2020 3 1 2020 6 5 2020 17 12 2020 Copyright © 2020 Society of Petroleum Engineers geologic modeling geological modeling flow in porous media Fluid Dynamics Artificial Intelligence history matching uncertainty space model...
Proceedings Papers

Paper presented at the SPE Kingdom of Saudi Arabia Annual Technical Symposium and Exhibition, April 23–26, 2018
Paper Number: SPE-192293-MS
... Abstract Ensemble smoother with multiple data assimilation (ES-MDA) is an advanced assisted history matching technique that is capable of reducing the utilization of existing computational resources while improving the quality of the simulation models by preserving the geological consistency of...
Proceedings Papers

Paper presented at the SPE Europec featured at 81st EAGE Conference and Exhibition, June 3–6, 2019
Paper Number: SPE-195500-MS
... Smoother with Multiple Data Assimilation (ES-MDA) in a synthetic reservoir is proposed. The permeability field inside the reservoir is parametrised with an unsupervised learning approach, namely K-means with Singular Value Decomposition (K-SVD). This is combined with the Orthogonal Matching Pursuit (OMP...
Proceedings Papers

Paper presented at the SPE Reservoir Characterisation and Simulation Conference and Exhibition, September 17–19, 2019
Paper Number: SPE-196680-MS
.... Data assimilation is conducted using an Ensemble Smoother with multiple data assimilations (ES-MDA). This paper has a significant focus on seismic data, with the corresponding result vector generated via a petro-elastic model. 4D seismic data proves to be a key additional source of measurement data...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2993625
... ABSTRACT In this work, we propose a stochastic nonlinear inversion framework for PP and PS seismic data based on the ensemble smoother with multiple data assimilations (ESMDA) to estimate elastic reservoir properties with uncertainty quantification. The ES-MDA is an iterative ensemble-based...
Proceedings Papers

Paper presented at the 5th ISRM Young Scholars' Symposium on Rock Mechanics and International Symposium on Rock Engineering for Innovative Future, December 1–4, 2019
Paper Number: ISRM-YSRM-2019-120
... effectiveness of various measures for conventional tunneling in urban environment shall be discussed. 2. Project overview &Challenges In Contract T207, 48m Adit tunnel which connect the main tunnel and escape shaft 1 (ES-1) is an important exit passage for emergency purpose. The geology consists of...
Proceedings Papers

Paper presented at the SPE Middle East Oil & Gas Show and Conference, March 6–9, 2017
Paper Number: SPE-183755-MS
... same datasets multiple times (ES-MDA). In this iterative ES procedure, the measurement error covariance matrix is inflated to obtain suitable updates for each iteration. Iglesias (2015) derived an iterative regularizing ES (IR-ES) based on iterative regularization techniques. The resulting method...

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