An Oman Carbonate Mixed Fractured/Matrix Oil and Gas Field: Water Flood or GOGD Decision Case Study.

A case study of a stacked, multi reservoir carbonate oil field in Central Onshore Oman is presented here to highlight the need for ongoing appraisal and integrated field development studies even after 25 years of production. Subsurface parameters such as abundance of high-k layers, and connectivity of faults, fault related fractures, distributed back ground fractures, and layer bound fractures are the key geological uncertainties that impact the selection of the field development options. Data integration is the key to a better understanding of such a complex fractured field. The proper and timely integration of reprocessed seismic (fault imaging, attribute interpretation), interference testing (cooperation with asset and field operations team) and iterations with dynamic reservoir simulation resulted in further improved history matches and reducing uncertainties, which enabled taking a development concept decision. This presentation is demonstrating the value of applying a fully integrated decision-driven static and experimental design dynamic modeling workflow to progress the ongoing FDP study.