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Previous published models for the stratigraphic evolution of the Middle Jurassic (Aalenian—Bathonian) Brent Group and its equivalents rely largely upon lithostratigraphy, with few reliable time lines for correlation across the Northern North Sea basin. To rectify this a new, largely well-based, multi-disciplinary regional study was undertaken, combining detailed biostratigraphic and sedimentological data from more than 450 wells across the whole of the Northern North Sea basin.

A basin-wide sequence stratigraphy for the Middle Jurassic has been developed, comprising two tectono-stratigraphic units (J20, Aalenian—Late Bajocian and J30, latest Bajocian—Middle Callovian), subdivided into five sequences: J22 (Aalenian), J24 (Early Bajocian), J26 (Early—Late Bajocian), J32 (latest Bajocian—Late Bathonian) and J34 (latest Bathonian—Middle Callovian). The tectono-stratigraphic units developed in response to …