Abstract
Publisher Summary This chapter presents the performance and classification of carbonate reservoirs. Large and small oil and gas companies alike are conducting ongoing, interdisciplinary studies of reservoir characterization and analysis of production performance. Application of petrophysics, fluid flow behavior, formation evaluation, well-testing, and reserve estimation disciplines to carbonate reservoirs is presented. The chapter explores the application of this knowledge to carbonate reservoir classification schemes and production practices so that more accurate and reliable predictions can be made of the reservoir's productive potential and performance. Four carbonate reservoir classification schemes will be discussed based on: (1) fluid composition in the reservoir, (2) type of available reservoir energy (drive mechanism), (3) type of pore system, and (4) geological nature of the reservoir. Classifications, based on fluid type or drive mechanism, apply to both carbonate and sandstone oil reservoirs. A classification system for carbonate reservoirs based on the configuration of the void space is unique to carbonate rocks. The fundamental difference, between the performance of sandstone and carbonate reservoirs, is because of the unique variations in limestone and dolomite porosity and their influence on fluid properties.
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