Journal of Geosciences and Geomatics
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Journal of Geosciences and Geomatics. 2013, 1(1), 15-21
DOI: 10.12691/jgg-1-1-3
Open AccessArticle

Palynostratigraphy and Age of the Sequence Penetrated by the Kolmani River 1 Well in the Gongola Basin, Northern Benue Trough, Nigeria

Nwojiji C.N.1, , Osterloff P.2, Okoro A. U3 and Ukeri P. O2

1Department of Geology and Exploration Geophysics, Ebonyi State University, Abakaliki, Nigeria

2Geological Services Team, Shell Petroleum Development Company (SPDC), Warri, Nigeria

3Department of Geological Sciences, Nnamdi Azikiwe University, Awka, Nigeria

Pub. Date: November 13, 2013

Cite this paper:
Nwojiji C.N., Osterloff P., Okoro A. U and Ukeri P. O. Palynostratigraphy and Age of the Sequence Penetrated by the Kolmani River 1 Well in the Gongola Basin, Northern Benue Trough, Nigeria. Journal of Geosciences and Geomatics. 2013; 1(1):15-21. doi: 10.12691/jgg-1-1-3

Abstract

Sediments from the Kolmani River -1 well in the Gongola Basin, Northern Benue Trough, Nigeria, have been analyzed for palynomorphs from 900 ft to 9140ft. The main lithologies encountered in the well consist of sandstones, sandy shales, mudstones and siltstones. The result of the pollen analysis shows that angiospermous pollens and pteridophyte spores dominate the five palynological Assemblage Zones delineated in the well. Each zone represents a time stratigraphic unit.correlatable to the identified lithostratigraphic units penetrated by the well. The Aquilapollenites minimus Assemblage Zone (Late Maastrichtian) correlates with the Kerri Kerri Formation. The Longapertites marginatus Assemblage Zone (Early Maastrichtian – Late Campanian) correlates with the Gombe Formation. The Dictyophyllidites harrisii Assemblage Zone (Early Santonian), the Syncolporites subtilis Assemblage Zone (Coniacian) and upper part of the Steevesipollenites binodosus Assemblage correlate with the Pindiga Formation while the lower Steevesipollenites binodosus Assemblage Zone (Turonian – Cenomanian) correlates with the Yolde Formation. The absence of the Late Santonian confirms the presence of the Santonian unconformity in the northern Benue Trough. Based on quantitative and qualitative biostratigraphic and sedimentological analyses, the overall depositional environment of the analyzed interval of the well varies from coastal plain/estuarine to open marine.

Keywords:
palynostratigraphy Benue Trough palynomorphs assemblage zones late cretaceous depositional environments age dating and unconformity

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