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Proceedings of the Second International Energy 2030 Conference,
November 4-5, 2008, Abu Dhabi, U.A.E.

Carbonate Reservoir Characterization An Integrated Approach and Future Research Needs

J. Frederick Sarg

Colorado School of Mines, USA

Abstract
Many carbonate reservoirs today occur in mature production environments. The remaining oil in most mature carbonate fields is generally contained within low porosity and low permeability reservoirs, and optimizing recovery will require new technology and work flows that focus on these hard to produce reservoir units. The carbonate reservoirs of the Middle East region are in an emerging mature province. They have undergone a complex depositional, diagenetic, and tectonic history. In general, these Mesozoic and Tertiary-aged reservoirs were deposited on broad ramps, where facies tracts are aerially extensive. They do, however, have complex depositional geometries and multi-component pore systems that require an integrated approach to build a working geologic model appropriate for reservoir simulation (e.g., [1,2]). Depositional facies in this region appear to exert a first order control on most reservoirs. The pore systems can be modified by both early (e.g. marine cementation, karsting, and dolomitization), and late burial diagenesis. Tectonic fracturing and faulting further overprint permeability and flow pathways. All of these factors must be accounted for in any geologic model.




 

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