--> Abstract: Best Practices in Static Modeling of Giant Carbonate Reservoirs, Onshore Abu Dhabi, United Arab Emirates, by Gérard Bloch, Shamsa Al Maskary, Luis Ramos, and Avni S. Kaya; #90077 (2008)

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Best Practices in Static Modeling of Giant Carbonate Reservoirs, Onshore Abu Dhabi, United Arab Emirates

Gérard Bloch*, Shamsa Al Maskary, Luis Ramos, and Avni S. Kaya
ADCO
*[email protected]

Over the last few years, the static reservoir modeling effort in ADCO has been significantly increased. Larges carbonate reservoir models have been either updated or generated for the first time. These models cover areas of 500–2,000 square km and reservoir thicknesses in the range of 15–450 ft. Average grid size of 50–250 m in the X and Y directions and 1–5 ft in the vertical axis are resulting in static model sizes of 2–40 million cells. The following practices have been shown to add considerable value to the static modeling effort: (1) integration of high-resolution sequence stratigraphy; (2) detailed definition of flow units, in line with dynamic requirement, captured in the static model as individual sub-zones; (3) geologically derived trend maps to constrain facies, thickness and porosity; (4) introduction of the shoulder bed concept to more accurately model reservoir property and avoid vertical leakages of properties; (5) thorough-core description and integration of thin sections, poro-perm and mercury injection capillary pressure (MICP) data to define reservoir rock types; (6) careful validation of core permeability data; (7) integration of core permeability values with well-test horizontal permeability (kh) and/or Production Logging Tool (PLT) data where available and derivation of actual K multipliers; (8) replacement of permeability values honoring well test kh and/or PLT results in un-cored sections and considering them as additional hard K data to improve dynamic history-matching; (9) integration of log saturation using J functions to link saturation to porosity, permeability and reservoir rock types; (10) Power Law linking porosity to permeability and stochastic modeling of the residual permeability to capture heterogeneity; (11) systematic production of quality-control plots. Some of these practices are still being refined and feedback from the audience will be very much appreciated.

 

AAPG Search and Discovery Article #90077©2008 GEO 2008 Middle East Conference and Exhibition, Manama, Bahrain