Abstract This paper discusses the reservoir aspects of the Countess ‘B’ Fireflood Pilot Project in southeastern Alberta. The Countess 'B J Pool is a Glauconitic channel sandstone and has been under waterflood since 1973. The fireflood pilot was initiated in 1983 and the operation is expected to continue until 1991. This 16 ha inverted five-spot includes one injector and four producers. The pilot was designed to determine the level of incremental recovery that could be achieved from the process application and to obtain operating experience from a reservoir containing 28 ° API oil. An extensive program of well testing and fluid analysis has been conducted to identify and evaluate the pilot performance. The Countess ‘B’ Fireflood Pilot has broken new ground in a number of ways. Results suggest that a waterflooded light oil reservoir can be fireflooded successfully. A mineralogical examination of a post-combustion core indicates that firefront temperature in this pool is 300 °C to 400 °C and oil is effectively displaced. To the end of 1988, the cumulative burned volume represented 20% of the pilot volume. To date the pilot has achieved most of its objectives and will likely achieve the remaining objectives prior to its termination in 1991. Introduction The Countess Upper Mannville ‘B’ Pool is located in Township 19, Range 16W4M, approximately 20 km west of the town of Brooks. Alberta (Fig. I). This pool is part of the Countess Latham trend and was discovered in 1965. The pool is operated by PanCanadian Petroleum Limited and jointly owned (50%) with LL&E Canada Ltd. The pool is currently in the later stages of waterflood. Extensive engineering and laboratory studies conducted on the Countess ‘B’ Pool during the period 1978–80 concluded that fireflooding application is feasible. A pilot project commenced in January 1983 in Part II of the Countess ‘B’ Pool to evaluate the fireflood process and is expected to continue until 1991. Reservoir In the Countess ‘B’ Pool, oil production is from a series of southeast/northwest trending channel sands. These sands are elongate and narrow with a length of up to 5 km and a width ranging from 300 m to 1500 m. Thickness varies from 1 m to 12 m. Based on lithology and stratigraphic position, the sandstones of the Countess ‘B’ Pool are part of the "'Glauconitic" of the Upper Mannville Group. Part II of the Countess "B' Pool, as shown in Figure 2, is the largest of these sands. Following are the average reservoir properties of Pan II:depth 1080mgross pay thickness 8 mporosity 25%permeability 800 mDinitial oil saturation78%initial reservoir pressure 9.6 MPareservoir temperature 38 °Coil gravity28 °C APIoil Viscosity @ reservoir conditions 6 cpinitial formation volume factor 1.124 The Glauconitic sandstones of the Countess ‘B’ Pool are generally fine- to medium-grained, moderately well sorted and composed of quartz and chert with minor feldspar and decrial clay. Cementation is mainly by authigenic clays, including kaolinite and to a lesser degree illite.