Full text loading...
-
From Basin Analysis to Play Concept - A Systematic Approach Applied to the Northern Depobelt of Niger Delta Basin
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 78th EAGE Conference and Exhibition 2016, May 2016, Volume 2016, p.1 - 3
Abstract
Environments of deposition of rocks greatly affect the type, nature and quality of hydrocarbon reservoirs and source rocks formed, consequently determining the hydrocarbon potential of an area. This study was aimed towards enabling accurate prediction of hydrocarbon source beds and reservoirs preserved within the northern depositional belt of Niger Delta Basin over geologic time span through the concept of petroleum plays.
Well log and 3-D seismic data acquired from a studied field located in the south-eastern portion of the northern depobelt were used for this study. Six wells were studied and correlated along the field to create a lithostratigraphic column which provided subsurface information to understand the distribution and evolution of depositional sequences and facies as they occur in the subsurface.
Petrophysical analysis and log cross-plots revealed the potential hydrocarbon source and reservoir beds across the different depositional environment as preserved in the study area. FOUR sand Facies (belonging to the channel systems) showed good potentials for housing hydrocarbons. The sands were further evaluated using seismic interpretations. The result revealed that the distributary and tidal channel sands were the major possible hydrocarbon prospects in the area with thickness ranging from 30m to 70m, and hydrocarbon saturation ranging between 40% and 78%. Shale units of the shoreface and prodelta facies showed good potentials for source rocks and seals.
This study has clearly shown that the northern depobelt of Niger Delta Basin is a prolific area where hydrocarbons are generated in the shale units of shoreface and prodelta facies. Distributary channels and tidal channels constitute the reservoir rocks. The good faulting systems of the Niger Delta Province provided pathways for hydrocarbon migration.