--> A Novel Approach of Integrated Reservoir Characterization and Advanced High-Resolution Geocellular Modeling: A Case Study of the Mauddud Carbonate Reservoir, Sabriyah Field, North Kuwait presented by Sabry A. Eisa

2018 AAPG International Conference and Exhibition

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A Novel Approach of Integrated Reservoir Characterization and Advanced High-Resolution Geocellular Modeling: A Case Study of the Mauddud Carbonate Reservoir, Sabriyah Field, North Kuwait presented by Sabry A. Eisa

Abstract

Ibrahim Hossam, (Kuwait Oil Company), Yassien Mohamed (ROXAR), Marko Maucec (Blue River Analytics), Gustavo Carvajal (BP) Abstract This paper describes a comprehensive workflow and integrated approach following the best practices to perform reservoir characterization and build a high-resolution geo-cellular modeling of a giant carbonate multi-reservoir in Sabriyah Mauddud (SAMA) in North Kuwait Fields. The Mauddud is a depletion reservoir and has been under water flood since 1999. The reservoir has been producing for almost 55 years and currently has an average water cut of approximately 40%. In previous dual porosity – dual permeability numerical models the observed water breakthrough appeared earlier than simulated, which indicates that the previous reservoir characterization could not capture the early water breakthrough. Further studies were conducted and concluded that the Mauddud reservoir is single porosity – single permeability model. This new conclusion lead to develop and build a high resolution geocellular model to capture the high permeability (super perm) streaks. The geological complexity of the field was better imaged by constructing the structural framework to include more than 80 seismic faults. This structural fault network provides a better understanding of PVT complexity in the reservoir. The previous studies have demonstrated that structural faults do not carry an important role in compartmentalization. This study described that these faults act as the main lateral baffle/barrier blocking the fluid flows and have an important effect on the streamline flow patterns. The PLT selection criteria was based on a single phase flow simulation at the beginning of the exploitation phase of wells with more than two perforated intervals, and PVT and production data available for production matching. The model was initialized using 26 J-Function tables, defined for the reservoir units as well as facies, due to deteriorating petrophysical properties towards flank and with depth. The final size of high-resolution geo-cellular grid is approximately 27 million cells. The new geological reservoir model captured additional 30% of STOIIP and was successfully history matched with no upscaling, using the Hybrid approach and high-performance parallel computing, providing better understanding of reservoir connectivity derived from PLT profiles and the chemical tracer data.