Lithostratigraphical and Palynostratigraphical Studies of Igbomotoru-1 Well, Niger Delta

Abstract

Palynological investigations were carried out on 41 side wall core samples of Igbomotoru-1 Well in the Niger Delta. The samples were from the intervals 1,123 to 3,583 m. A lithostratigraphical interpretation of the well was made by studying gamma ray logs, the drilled samples and lithologic descriptions made available by the Shell Petroleum Development Company of Nigeria (SPDC). It resulted in the delineation of four informal lithostratigraphical units (A, B, C, D) which show lithological characters of the Benin and Agbada Formations. The studied interval was assigned Middle Miocene to Upper Miocene age on the basis of such age diagnostic miospores as Crassoretitriletees vanraadshoveni, Peregrinipollis nigericus, Zonocostites ramonae and Multiareolites formosus. Three palynological sub-zones which were from top to bottom and subdivision of Crassoretitriletes vanraadshooveni zone of earlier workers in the area were established. These are: Peregrinipollis nigericus sub-zone Retitricolpites sp. 1 sub-zone Clavamonocolpites sp. sub-zone. Paleoenvironmental analysis based on the palynomorph assemblage and lithological characters indicated a transitional depositional environment. However, the relative abundance of Zonocostites ramonae (cf. Rhizophora sp.) at some levels in the studied interval pointed to a dominantly mangrove swamp environment.

Department(s)

Geosciences and Geological and Petroleum Engineering

Keywords and Phrases

depositional environment; gamma ray log; lithostratigraphy; palynology; stratigraphic analysis; Nigeria, Niger Delta

Geographic Coverage

Niger

International Standard Serial Number (ISSN)

0899-5362

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1989 Elsevier, All rights reserved.

Publication Date

01 Jan 1989

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