Authors :
Eze, Emeka Lazarus; Okengwu, Kingsley Onyekwere; Soronnadi-Ononiwu, Geoffrey Chijioke
Volume/Issue :
Volume 8 - 2023, Issue 11 - November
Google Scholar :
http://tinyurl.com/2rftrsej
Scribd :
http://tinyurl.com/bdfzk2b7
DOI :
https://doi.org/10.5281/zenodo.10638273
Abstract :
Paleoenvironmental interpretation and
palynozonation was carried out using fifty ditch cutting
samples ranging from 7020 ft – 10020 ft, with a total
thickness of 3000 m from Osere-004 Well. The lithology
of the ditch cuttings was described and analysed using
wet-sieving technique. Palynological sample preparation
was also carried out on the ditch cuttings following the
non-mineral acid method and was analysed using
transmitting light microscope. The lithologic description
and wet-sieve analysis generated the lithology and sand-
shale ratio/gradational plot. The palynological analysis
indicated the palynomorphs recovered from the
palynological sample preparation which were grouped in
their paleoenvironments. The statistical analysis of the
recovered palynomorphs indicated dominance in
terrestrially derived palynomorphs (Pollen and spores)
over marine derived palynomorphs. This indicated
deposition within continental (fresh water to brackish
water) environment to nearshore marine and open
marine environment. The ditch cuttings were deposited
during the late Miocene to early Pliocene times and
corresponded to P870 to P860 of the SPDC palynological
zonation.
Keywords :
Paleoenvironment, Palynozonation, Lithostratigraphy, Sand-Shale Ratio, Gradation.
Paleoenvironmental interpretation and
palynozonation was carried out using fifty ditch cutting
samples ranging from 7020 ft – 10020 ft, with a total
thickness of 3000 m from Osere-004 Well. The lithology
of the ditch cuttings was described and analysed using
wet-sieving technique. Palynological sample preparation
was also carried out on the ditch cuttings following the
non-mineral acid method and was analysed using
transmitting light microscope. The lithologic description
and wet-sieve analysis generated the lithology and sand-
shale ratio/gradational plot. The palynological analysis
indicated the palynomorphs recovered from the
palynological sample preparation which were grouped in
their paleoenvironments. The statistical analysis of the
recovered palynomorphs indicated dominance in
terrestrially derived palynomorphs (Pollen and spores)
over marine derived palynomorphs. This indicated
deposition within continental (fresh water to brackish
water) environment to nearshore marine and open
marine environment. The ditch cuttings were deposited
during the late Miocene to early Pliocene times and
corresponded to P870 to P860 of the SPDC palynological
zonation.
Keywords :
Paleoenvironment, Palynozonation, Lithostratigraphy, Sand-Shale Ratio, Gradation.
