Palynofacies Analysis of Ida 5 Well, Niger Delta Basin, Nigeria

Abstract

Palynofacies anlyses of the strata penetrated by Ida-5 well were carried out with the aim of establishing palynostartigraphic zones, biochronology and palaeoenvironment of deposition of the staritgraphic sequence of the well. Fiftyu ditch cutting samples within the interval of 2207 - 3569 m were analysed. The acid method of sample preparation for palynofacies analyses was followed. the analyses yielded low to abundant pollen and spores, small to large sized palynomacerals 1 and 2, with few palynomacerals 3 and 4. The lithology showed alternation of shale and sandstone units as well as sandy shale. The studied intervals were dataed middle Miocene to Late Miocene based on the recovered age diagnostic species such as Multiarcolites formasus, Verrutricolporites rotundiporus, Crassoretitriletes vanraadshoveni and Striatrcolporites catatumbus-Racemonocolpites hians zones. The lithology indicates that the entire studied interval belongs to the Agbada Formation. Using the international Stratigraphic guide for the establishment of biozones, three interval range zones were established. These area: Multiareolites formosus, Monoporites annulatus, Verrutricolporites rotundiporous-Crassorentitreletes vanraadshoveni and Striatricolporites catambus-Racemonocolpites hian zones. Paleoenvironmental interpretation based on the lithology and palynofacies association revealed that the startigraphic interval was in the coastal-deltaic environments.