Abstract

The Westphalian B in the Campine Basin in Belgium contains a low net-to-gross succession of fluvial channel and crevasse sandbodies embedded in lacustrine and floodplain claystone and siltstone. Study and correlation of closely spaced boreholes reveals a localized 15–25 m thick succession of stacked fluvial channel sandbodies in this overall low net-to-gross setting. This concentration of sandbodies is interpreted as the fill of a tectonically induced palaeo-valley based on the orientation of syn-sedimentary faults and the palaeogeographical setting of the Campine Basin, far away from the Westphalian sea. The depositional model was used to interpret stacks of fluvial sandstone of the Caister Sandstone (Westphalian B) in the Dutch offshore and may guide finding economic reservoirs in the overall low net-to-gross labyrinth-type fluvial architecture in this area and in comparable structural settings.

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