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Technology Focus: History Matching and Forecasting (April 2014)

Authors
Alexandre Emerick (Petrobras Research Center)
DOI
https://doi.org/10.2118/0414-0118-JPT
Document ID
SPE-0414-0118-JPT
Publisher
Society of Petroleum Engineers
Source
Journal of Petroleum Technology
Volume
66
Issue
04
Publication Date
April 2014
Document Type
Journal Paper
Pages
118 - 118
Language
English
ISSN
0149-2136
Copyright
2014. Copyright is retained by the author. This document is distributed by SPE with the permission of the author. Contact the author for permission to use material from this document.
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Technology Focus

In the past decade, there has been a great deal of research and progress in the development of computational methods to assist reservoir engineers in the arduous task of history matching their models. Developments in computer hardware and software and the use of geostatistics, optimization, and Monte Carlo methods are among the reasons for such progress. However, the requirements for a good history match also have been increasing. If, in the past, we were satisfied with a good data fit, this is definitely not the case anymore. Modern history matching is a much more comprehensive discipline. It entails geological modeling, geostatistics, reservoir simulation, scale issues, data analysis, deep understanding of reservoir mechanisms, interdisciplinary approaches, optimization methods, statistics, and inverse-problems theory.

Nevertheless, we have to recognize that history matching in itself is not the goal. The goal is to generate models for production forecasting aiding the decision-making process involved in the development and management of petroleum reservoirs. One can definitely argue that a good history match does not ensure a reliable forecast. On the other hand, forecasting from models without a reasonable history match is most certainly temerarious (and probably meaningless). In fact, forecasting is an inherently uncertain process. In this sense, the goal of history matching is to mitigate this uncertainty. However, we have to keep in mind that uncertainty will never be removed completely. First, models are only representations of the actual physical phenomena; there will always be approximation errors. Second, data are insufficient and have measurement errors; hence, it is impossible to fully determine all unknown model parameters. Finally, uncertainty quantification has a high degree of subjectivity. Hence, bad forecasting often will be related to wrong assumptions and misinterpretations.

Among current research trends in history matching and forecasting, it is worth mentioning uncertainty quantification, methods based on ensembles, assimilation of time-lapse seismic data, and history matching of models with complex physics (e.g., fractured reservoirs and thermal recovery processes). However, one particular topic has caught the attention of many researchers: the development of history matching workflows that fully integrate the geological modeling in the loop. This is often called the “big-loop approach.” Despite the developments in methods, software, and computers, human intervention and good engineering judgment will continue to be vital. Therefore, it is important to keep up to date in the literature. The papers summarized in this feature and those indicated in the additional-reading list are good examples of recent developments in, and field applications of, history matching and forecasting. JPT

Recommended additional reading at OnePetro: www.onepetro.org.

SPE 163638 Estimation of Mutual Information and Conditional Entropy for Surveillance Optimization by Duc H. Le, The University of Tulsa, et al.

SPE 167150 Prior Information Enhances Uncertainty Quantification in Shale- Gas Decline-Curve Forecasts by Raul Gonzalez, Texas A&M University, et al.

SPE 163604 Preventing Ensemble Collapse and Honoring Multipoint Geostatistics With the Subspace EnKF/ EnS and Kernel PCA Parameterization by Pallav Sarma, Chevron ETC, et al.

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