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Abstract

Summary

For data assimilation problems there are different ways in using available observations. While certain data assimilation algorithms, for instance, the ensemble Kalman filter (EnKF, see, for example, ) assimilate the observations sequentially in time, other data assimilation algorithms may instead collect the observations at different time instants and assimilate them simultaneously. In general such algorithms can be classified as smoothers. In this aspect, the ensemble smoother (ES, see, for example, ) can be considered as an smoother counterpart of the EnKF.

The EnKF has been widely used for reservoir data assimilation problems since its introduction to the community of petroleum engineering ( ). The applications of the ES to reservoir data assimilation problems are also investigated recently. Compared to the EnKF, the ES has certain technical advantages, including, for instance, avoiding the restarts associated with each update step in the EnKF and also having fewer variables to update, which may result in a significant reduction in simulation time, while providing similar assimilation results to those obtained by the EnKF ( ).

To further improve the performance of the ES, some iterative ensemble smoothers are suggested in the literature, in which the iterations are carried out in the forms of certain iterative optimization algorithms, e. g., the Gaussian-Newton ( ) or the Levenberg-Marquardt method ( ), or in the context of adaptive Gaussian mixture (AGM, see Stordal and Lorentzen, 2013).

In this contribution we show that the iteration formulae used in can also be derived from the regularized Levenberg-Marquardt (RLM) algorithm in inverse problems theory ( ), with certain linearization approximations introduced to the RLM. This does not only lead to an alternative theoretical tool in understanding and analyzing the behaviour of the aforementioned iterative ES, but also provide insights and guidelines for further developments of the iterative ES algorithm. As an example, we show that an alternative implementation of the iterative ES can be derived based on the RLM algorithm. For illustration, we apply this alternative algorithm to a facies estimation problem previously investigated in , and compare its performance to that of the (approximate) iterative ES used in .

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2014-09-08
2024-04-20

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On an Alternative Implementation of the Iterative Ensemble Smoother and its Application to Reservoir Facies Estimation
Conference Proceedings 2014, 1 (2014); https://doi.org/10.3997/2214-4609.20141788
/content/papers/10.3997/2214-4609.20141788
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