Predicting Coastal Depositional Style: The Role of Accommodation/Sediment Supply and Basin Morphology within a Sequence Stratigraphic System on Selected Wells (Mid Miocene to Pliocene) in Coastal Swamp Depobelt, Niger Delta Basin, Nigeria

Abstract

The depositional style of mid- Miocene to Pliocene sediments of selected wells in Niger Delta was studied to ascertain its dominating and influencing depositional system. The Ainsworth predictive model/trends were applied in determining the depositional system and styles, which takes into consideration the Basin morphology and accommodation/ sediment supply regime within a sequence stratigraphic system. The study suggests that depositional style of sequences 1,2,5 and 6 are fluvial- dominated, tide-influenced environment, which is marked by low wave effectiveness, high sediment supply/low accommodation and moderately embayed shoreline morphology, while sequences 3,4 and 7 are wave dominated, tide-influenced environment, which was noted with high wave effectiveness, low accommodation/high sediment supply and moderately embayed shoreline  morphology. This study shows that the underlying basis morphology (moderately embayed) played a significant role in predicting the depositional style of the study area.

Keywords: sequence stratigraphy, accommodation/sediment supply, basin morphology, Depositional style and Niger Delta Basin.