Abstract: Major Seismic Facies of the Opuama Channel area, and their Hydrocarbon Potential - Southwestern Niger Delta

ADEJOBI, ADEDOJA R

The Opuama Channel area of Southwest Niger Delta is intriguing both for its complex geology and its potential as a major hydrocarbon trend in the basin.

The geometry, stratigraphy and hydrocarbon potentials of the Opuama Channel Complex area, were studied using good quality 3D seismic data integrated with biostratigraphic, geochemical and well log data. Four seismic facies units, A, B, C and D were recognized, based on reflection configuration, termination or continuity of events, shape and amplitude. Well logs, biostratigraphic and geochemical studies provided information on lithology, age, environment of deposition and the hydrocarbon system.

The resulting seismic time and depth maps indicate that the axis of the channel complex trends NE-SW, grazing the edges of the Opuama and Gwato Fields. Repeated and simultaneous channeling is also evident on seismic, suggesting the existence of secondary tributary channels within the Opuama Canyon area. The maximum depth of the channel complex within the study area is approximately 3200 m (10500 ft) subsea.

Besides structural plays, strong possibilities exist for stratigraphic plays, including truncation plays, canyon fill and drape structures. However, the stratigraphic plays have higher risk of finding hydrocarbons because the reservoirs are harder to predict. Integrating all exploration and evaluation tools to properly model the subtle plays expected will minimize the risk.

AAPG Search and Discovery Article #90942©1997 AAPG International Conference and Exhibition, Vienna, Austria