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Abstract

Alba is a heavy oil (19 –20° API) field discovered in 1984 and brought on production in 1994. The oil is reservoired within middle Eocene turbiditic sands deposited within hemipelagic background argillaceous sediments. Alba sands have been subjected to postdepositional remobilization and sand injection on a field- wide scale. Sand geometries are highly complex. Prediction of sand-shale lithology from the Alba field four-component Ocean Bottom Cable seismic data set is refined through detailed horizontal and vertical well-seismic integration. Reservoir sands are subdivided into remobilized or injected and depositional facies in all wells by recognition in cores and/or logging-while-drilling response and by elastic impedance seismic character. An abundance of multiple horizontal well sidetrack data (commonly in the same vertical plane) in the Alba field allows the construction of facies cross sections against a seismic impedance data backdrop with some confidence. A new, threedimensional (3-D) geomodeling software is used that can directly include these facies cross sections as constraints on geomodeling, in addition to conventional well and seismic data constraints. This allows a degree of geological interpretation to be imposed and supported with outcrop analogs within the uncertainties of the available data. Numerous equiprobable 3-D cellular geomodel possibilities are created that differentiate remobilized or injected reservoir facies from depositional reservoir facies. The impacts of facies variability on production profiles are tested in a streamline reservoir simulator at the geological model scale.

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