This report presents a detailed palynostratigraphic analysis of Triassic successions from the UK and Dutch sectors of the Southern North Sea, with additional data from Dutch onshore and Central North Sea wells. Building on the framework established in CASP.BSSC.1, this study refines and applies the palynozonal scheme offshore, significantly improving age constraints and cross-border correlation.

A total of 295 samples were analysed from the Southern North Sea and Dutch onshore, alongside 69 samples from the Central North Sea. This analysis led to the recognition and description of twelve biozones (Changhsingian–Hettangian), enhancing regional correlation and refining the dating of key reservoir and seal intervals. The resulting biostratigraphic framework strengthens regional stratigraphic understanding and supports ongoing reservoir and seal characterisation for Geological Carbon Storage and Geological Disposal Facility development.

Delivery of data

The data are presented in a fully illustrated physical and electronic report (233 pages), which includes ten photo plates and twelve enclosures documenting the biozonal assemblages and the range and occurrence of their constituent Triassic palynomorphs, respectively.

Completed: March 2025

Report details: A palynozonation of the Bunter Sandstone CO2 storage complex: offshore well study

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