Collected reprints: Abstract 2983

Collected reprints

Abstract

Jacobs, P.; Bolle, I.; De Batist, M.; De Ceukelaire, M.; De Corte, B.; Sevens, E.; Van Burm, Ph.; Walraevens, K. (1997). Integrated stratigraphy and sedimentology of the Late Ypresian Egem Member sands (Yd) (Southern Bight North Sea Basin, Belgium). Zbl. Geol. Paläont. Teil I. 5/6: 423-442

In the Belgian Basin, the overall regressive conditions at the end of the Early Eocene Ypresian stage are superimposed by several minor but distinct transgressive pulses. Biostratigraphic resolution was in general too poor to unravel the vertical succession of the sandy glauconitic deposits spanning the Early to Middle Eocene boundary. High sediment supply and a rapidly changing deltaic depositional environment created strong lateral facies shifts which resulted in several stratotypes of local importance. In this paper an attempt is made to decode these lateral and vertical facies variations in the Late Ypresian Egem Member sands. Lithology-related characteristics (like geotechnical data and geophysical well log parameters for onshore sediments together with offshore seismic data) enable the reconstruction of a general vertical succession of lithological Egem Member sands subunits. This model seems valid in the regional context of the Southern Bight of the North Sea Basin : its sequence stratigraphical framework was tested through correlation feedback to outcrops and boreholes, and its sediment facies architecture was interpreted in terms of relative sea level fluctuations.

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