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19. WELL CORRELATION AND SEISMIC STRATIGRAPHIC ANALYSIS OF “ENA FIELD”, NIGER DELTA BASIN, NIGERIA by F. A. LUCAS and O.O. EFEMENA Volume 53 (November 2019 Issue)
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WELL CORRELATION AND SEISMIC STRATIGRAPHIC ANALYSIS OF “ENA FIELD”, NIGER DELTA BASIN, NIGERIA

F. A. LUCAS and O.O. EFEMENA

Subsurface Evaluation Geology, Department of Geology, University of Benin, Benin, Nigeria

Abstract

Hydrocarbon exploration is becoming increasingly more difficult and expensive, since most of the identified structural closures on the shelf and upper slope have been drilled, but there is enough possibility of finding more oil and gas in the deep-water plays, if more accurate exploration technique is employed in the right place. This work is an integrated sequence stratigraphic study of “Ena Field”, in the coastal swamp depobelt I, Western Niger Delta, Nigeria. It is aimed at improving the present understanding of the structural development, sequence stratigraphic history, paleo- depositional environments and hydrocarbon reservoir potential of the field. A 3-D seismic volume, wireline logs from six wells were used to determine the different lithologies and to evaluate the reservoir properties, biofacies data and, check shot data were used to produced well-seismic ties on the 3-D seismic volume. Tie has a general good fitting. Seismic sequence interpretation revealed that the succession in the field consists of three sequence boundaries dated, 12.1Ma, 13.1Ma and 15.5Ma and three maximum flooding surfaces, dated 11.5Ma, 12.8Ma, and 15.0Ma respectively.

The correlation panel cross sections of the stratigraphic column revealed four wells to be dipping in NW – SE and three wells to be dipping NE – SW. The stratigraphic framework of the depositional sequence becomes thicker down the dip direction. Two correlation panel cross sections also showed the strike directions. The structure is bounded to the Northeast by a major growth fault. It is partially separated into two blocks by a synthetic growth fault with varying throws along its length. The depositional settings of the Middle Miocene strata were influenced by fluvial, tidal and marine systems. The up dip areas which seismically form a continuous high-amplitude reflection surface with closure signify possible hydrocarbon exploration targets. Good structures that favour hydrocarbon entrapment abound in the field. Oil and gas accumulation is high and widespread throughout the field.

Keywords: Seismic stratigraphy, Hydrocarbon potentials, sequence, exploration

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