Journal of Petroleum Geology, Vol.15, No.1, pp. 97-110, 1992
©Copyright 2000 Scientific Press, Ltd.
LOWER CRETACEOUS PALYNOLOGY AND SANDSTONE
DISTRIBUTION IN THE SCAPA FIELD, U.K. NORTH SEA
L. A. Riley,* S. D. Harker** and S. C. H. Green**
*Paleo Services, Watford, U.K.
**Elf Enterprise Caledonia Ltd., Aberdeen.
Three discrete turbidite sandstone bodies form the Scapa Sandstone
Member reservoir units within the limestone, marl and conglomerate sequence of the Early
Cretaceous Valhall Formation in the Scapa field (UK North Sea Block 14/19). Eighteen
palynological zones have been established for the Valhall Formation, designated as VA in
the early Aptian through VR in the latest Ryazanian. Scapa reservoir sandstones are
restricted to the late Hauterivian VF to early Valanginian VQ zones. Black, anoxic
mudstones of the Fischschiefer Member form a widespread intra- early Aptian correlation
marker at the base of zone VA in the upper Valhall Formation.