History Matching Of The Norne Full Field Model Using An Iterative Ensemble Smoother

Abstract

Abstract Although ensemble-based data assimilation methods such as the ensemble Kalman filter and the ensemble smoother have been extensively used for history matching of synthetic models, the number of applications of ensemble-based methods for history matching of field cases is extremely limited. In most of the published field cases in which the ensemble-based methods were used, the number of wells and the types of data to be matched were relatively small. As a result, it may not be clear to practitioners how a real history matching study would be accomplished using ensemble-based methods. In this paper, we describe the application of the iterative ensemble smoother to the history matching of the Norne field, a North Sea field, with a moderately large number of wells, a variety of data types, and a relatively long production history. Particular attention is focused on the problems of identification of important variables, generation of an initial ensemble, plausibility of results, and efficiency of minimization. We also discuss the challenges encountered in using ensemble-based method for complex field case studies that are not typically encountered in synthetic cases. The Norne Field produces from an oil and gas reservoir discovered in 1991 offshore Norway. The full field model consists of four main fault blocks that are in partial communication and many internal faults with uncertain connectivity in each fault block. There have been 22 producers and 9 injectors in the field. Water alternating gas injection is used as the depletion strategy. Production rates of oil, gas and water of 22 producers from 1997 to 2006 and RFT pressure from 14 different wells are available for model calibration. The full field simulation model has 22 layers each with dimension 46 by 112 cells. The total number of active cell is about 45,000. The Levenberg-Marquardt form of the iterative ensemble smoother (LM-EnRML) is used for history matching the Norne full field model using production data and RFT pressure. The model parameters that are updated include permeability, porosity and net-to-gross ratio at each gridblock, vertical transmissibility at each gridblock for six layers, transmissibility multipliers of 53 faults, end-point water and gas relative permeability of four different reservoir zones, depth of water-oil contacts and transmissibility multipliers between a few main fault blocks. The total number of model parameters is about 150,000. Distance-based localization is used to regularize the updates from LM-EnRML. LM-EnRML is able to achieve improved data match compared to the manually history matched model after three iterations. Updates from LM-EnRML do not introduce artifacts in the property fields as in the manually history matched model. The automated workflow is also much less labor intensive than manual history matching.