Miospore Biozonation and age characterization of Upper Miocene - Pliocene sediments in well X, deep offshore Niger delta.

Abstract

Miospore biozonation carried out on ditch cutting rock samples has been used to delineate the Upper Miocene/Pliocene sediments in well X, deep offshore, Niger delta. The rock succession is characterized by the alternation of sand and shale of variable thicknesses with lateral gradation in grain size. The base of the studied interval is made of Black shales intercalating with medium to coarse grained, sub rounded to rounded sandstone and siltstone at intervals representing the paralic Agbada formation while the top is made of Sub angular-sub rounded quartz pebble conglomerate, pebbly sandstone, medium-coarse grained, sub-rounded to well-rounded sandstone, intercalating with very thin lenses of grey shales typically of the coastal plain sand of the Benin Formation. The palynological characterization of the well yielded a well preserved and diverse biostratigraphic important Miospores among which sixty-one miospores (fifty-one pollen and ten spores) were identified and used to erect ten miospore zones. The biozonation is premised on the recognition of the first and last downhole occurrences of these Palynological events. The zones are defined from the base to top as follows: Magnastiatites howardi, Inerperturopollenites sp, Caryapollenites veripites, Striatricolpites catatumbus, Verrutricolporites rotundiporis, Echitriporites spinosus, Canthimidites sp, Pordocarpus milanjanus and Verrutriculporites rotundiporis. Correlation with the existing pantropical zones yielded Upper Miocene to Pliocene age. Results from textural and lithological analysis show that the rock succession penetrated the Agbada and Benin Formations.

Climate and geological change as drivers of Mauritiinae palm biogeography

“…Records of E. barbeitoensis were found only in the Miocene (Hoorn, 1994a;Jaramillo et al, 2011;Lorente, 1986;Muller et al, 1987;Rull, 1998). In Africa, G. magnaclavata and G. polygonalis are recorded until the late Miocene (Asadu & Ofuyah, 2017;Umeji, 2003).…”

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“…In order to create a geological model and shed light on the petroleum systems, the science of petroleum exploration uses a variety of tools, including the integration of palynology with other geological disciplines like geophysics, sedimentology, geochemistry, and petrophysics . Numerous authors from the past and present (Rull, 2002, Asadu & Ofuyah, 2017, Lucas & Ononeme, 2019, Jacinta & Edward, 2019, Fadiya et al, 2020, as well as many others, have conducted numerous research investigations using specific distinctive palynomorph indicators found within sediments with regard to understanding the perception of age determination, stratigraphic biozonation, paleoenvironmental impact, paleo-ecological dominance, and paleo-climatic implications as well as the presence of petroleum and other minerals.…”

Palynomorph Biostratigraphy of VIC 97 Well, Nothern Depo Belt, Niger Delta, Nigeria

“…In order to create a geological model and shed light on the petroleum systems, the science of petroleum exploration uses a variety of tools, including the integration of palynology with other geological disciplines like geophysics, sedimentology, geochemistry, and petrophysics . Numerous authors from the past and present (Rull, 2002, Asadu & Ofuyah, 2017, Lucas & Ononeme, 2019, Jacinta & Edward, 2019, Fadiya et al, 2020, as well as many others, have conducted numerous research investigations using specific distinctive palynomorph indicators found within sediments with regard to understanding the perception of age determination, stratigraphic biozonation, paleoenvironmental impact, paleo-ecological dominance, and paleo-climatic implications as well as the presence of petroleum and other minerals.…”