The Tiffany and Toni fields lie at the western margin of the South Viking Graben in the Northern North Sea in UK Block 16/17. The reservoirs are composed of coarse clastic sediments of the Upper Jurassic Brae Formation, which were deposited by turbidity currents and debris flows in a submarine fan setting. The Brae Formation accumulated adjacent to the graben margin fault scarp and abuts pre-Jurassic rocks of the Fladen Ground Spur to the west. The Kimmeridge Clay Formation provides both the source of hydrocarbons and the seal for the reservoir.

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