Refined Reservoir Description to Maximize Oil Recovery


W.E. Flewitt,
Imperial Oil Limited

5th Formation
Evaluation Symposium of the Canadian Well Logging Society in
Calgary, May 5-7, 1975



INTRODUCTION To assure maximized oil recovery from older pools, reservoir description has been advanced by fully integrating ori ginal open-hole logs and the recently introduced interpretive techniques made available through cased-hole wireline saturation logs. A refined reservoir description utilizing normalized original wireline porosity logs has been completed in the Judy Creek Beaverhill Lake ‘A’ Pool, a reefal carbonate pool with current potential productivity of 100,000 BOPD and 188 active wells. Continuous porosity was documented within a reef rim and cap while discontinuous porous lenses characterized an interior lagoon. With the use of pulsed neutron logs and production data a separate water front and pressure response was recognized within discrete environ- mental units. The refined reservoir description aided in reservoir simulation model studies and quantifying pool perfor- mance. A pattern water flood has now replaced the original peripheral bottofi water drive to maximize oil recovery.