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.