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The Barents Sea sedimentary basin represents one of the key prospective regions for hydrocarbon resources in the Arctic realm (Figures 1a and 1b). However, while the Norwegian part of the Barents Sea is covered by a dense network of seismic lines and penetrated by numerous wells, the Russian portion is comparatively poorly studied. To date, the sedimentary succession of the Russian part has only been penetrated by a few wells drilled in the southern part of the basin and four wells drilled onshore across the Franz Josef Land (FJL) archipelago. FJL represents an important region, where the Mesozoic succession is exposed onshore for geological study (Figure 2b). Due to the lack of offshore wells, this archipelago represents the only area in the north-eastern Barents Sea where the Mesozoic succession can be directly described and sampled, offering vital insights into the geological evolution of this insufficient studied region.The deeper pre-Mesozoic succession of the north-eastern Barents Sea has been mainly constrained by seismic data (

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