In the Dutch central offshore, the major part of exploration activity concerns the Lower Slochteren Sandstone Formation of the Saxonian series (Permian). These sands exhibit a decreasing thickness, from more than one hundred meters in the South to just a few meters in the North, and cannot be picked on the seismics. They are sealed by the Silverpit Claystone Formation (Saxonian) itself overlain by the Zechstein Evaporates, and sourced by the coals of the Westphalian series. All the Saxonian series were deposited in a continental aeolian to fluvio-lacustrine environment, the sedimentary processes being controlled by the sand supply coming from the London-Brabant Massif in the South and by the fluctuating water table level of the Permian lake in the-North.


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