International Journal of Science and Technology

International Journal of Science and Technology>> Volume 7, Number 9, September 2017

International Journal of Science and Technology


Sequence Stratigraphy of Some Middle to Late Miocene Sediments, Coastal Swamp Depobelts, Western Offshore Niger Delta

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Author Adegoke, Adebanji Kayode
On Pages 18-27
Volume No. 2
Issue No. 1
Issue Date January 01, 2012
Publishing Date January 01, 2012
Keywords Niger Delta, Sequence stratigraphy, Depositional sequence, Systems tract, Sedimentary cycle, Source rock.


Abstract

An integrated interpretation of well logs and biostratigraphic data of three selected oil wells (Exxit 73, 75 and 78) of OML 99 within the western offshore Niger Delta was carried out for the sequence stratigraphic analysis of sediments penetrated by the wells. This enabled the subdivision of the stratigraphic column within the wells into depositional sequences and sedimentary cycles. Three depositional sequences were identified and they are characterized as highstand systems tract, transgressive systems tract and lowstand systems tract. Three maximum flooding surfaces and three sequence boundaries were also recognized. The depositional environment of the study area is inferred to be of deltaic shelfal-transitional type. These depositional sequences have potential to serve as excellent source rock and seals. Sand percentage calculation showed that the maximum flooding surfaces correspond to the major shale break i.e. high shale content. Further studies also identified the major fault planes and a hydrocarbon potential, speculated probably at 11800ft. Utilizing the Palynological Zonation of Exxit 73, 75 and 78, the ages of the sediments penetrated in the wells were inferred to range from Middle - Late Miocene.

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