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The Upper Jurassic Oxfordian Play on the NCS: The Role of Geophysics in Characterizing a Challenging Sandstone Reservoir

Exploration and development of Jurassic sandstones on the southern and central NCS mainly focused on the Brent reservoir interval. The Skarfjell discovery to the west of the Vega field refocused exploration in the area to the Upper Jurassic strata. We present a case study from the Vega area of Q35 where recent oil discoveries have been made in so far underexplored Upper Jurassic deep marine turbidite sandstones. Oxfordian sandstones penetrated by the exploration wells were found to be strongly cemented and tight, but significant sand thicknesses and turbidite channel fairways have been mapped on seismic. In a rather difficult seismic imaging context and in the structurally complex Northern North See geology including tilted and inverted fault blocks, seismic inversion was successfully used as sandstone facies discriminator. A new play concept was established for Upper Jurassic Oxfordian reservoirs. A refined integrated seismic to geomodelling approach using the new exploration wells as constraint allowed to characterize reservoir quantity and quality for development evaluation purposes.