Journal of Petroleum Geology, Vol.16,
No.2, pp. 197-212, 1993
©Copyright 2000 Scientific Press,
Ltd.
DEPOSITIONAL HISTORY OF
THE E2.0 RESERVOIR
IN THE KOLO CREEK
FIELD, NIGER DELTA
F. E. Oboh*
* Dept. of Geology and Geophysics,
University of Missouri, Rolla, MO 65401. USA.
Abstract
The paleoenvironments of the middle Miocene
E2.0 Reservoir in the Kolo Creek field have been
reconstructed in cores of Wells 27 and 29 from investigations of
sedimentological and microfossil data. The sediments were
examined for lithological features, trace fossils, mineralogical
composition, diagenetic imprints, palynodebris, palynomorphs and
foraminifera, and these results were integrated with geophysical
log data. Seven deltaic sub-environments of deposition have been
recognized, the distributary channel-fill, lagoon/tidal flat,
coastal barrier and delta fringe sub-environments were common to
both cores, while the prodelta was present in the core of Well
27, and lagoonal and flood-tidal deltas occurred in Well 29. The
sequence stratigraphic concept has been applied to these
sub-environments, and using the information from Wells 27 and 29,
well-to-well log correlation across the entire field allowed a
reconstruction of the depositional history of the reservoir. The
reservoir was deposited as one or two progradational
parasequences during a high-frequency highstand systems tract.
There was more open vegetation and extensive development of
lagoons/tidal flats in the western part of the field, but the
overall depositional trend is similar to that of the present-day
Niger Delta.