Data Validation: Key to Development of an Integrated Reservoir Model for the Wara Formation, Greater Burgan Field

Abstract

Summary Prior coarse grid simulation models in the Greater Burgan field were unable to capture the stratigraphically diverse nature of the Wara reservoir and accurately match the existing historical data, resulting in unrealistic predictions of fluid flow from individual reservoir layers. Most simulation failures are blamed on the inability to correctly model reservoir heterogeneity rather than problems associated with the data it is trying to match. In reality it is probably a function of both. In this paper, we emphasize the importance of a systematic review of historical production data to ensure the accurate initialization of a simulation model and to assess whether a full history match should or should not be undertaken. Not only does there need to be sufficient geologic and engineering detail to accurately characterize the fluid and flow properties of the Wara reservoir, but, more importantly, issues involving the validity, accuracy, and lack of historic data need to be addressed before deciding whether a reasonable reservoir model for history match can be developed. The reservoir size, long history, and high production rates of the Greater Burgan field magnify the impact and highlight the importance of correcting data errors and recognizing data uncertainty and gaps.