Palynostratigraphy, Palynozonation and Depositional Systems in Kombo-001 Well, Niger Delta Nigeria


Authors : Eze, Emeka Lazarus; Okengwu, Kingsley Onyekwere; Soronnadi-Ononiwu, Geoffrey Chijioke

Volume/Issue : Volume 8 - 2023, Issue 10 - October

Google Scholar : https://tinyurl.com/3x87pbf8

Scribd : https://tinyurl.com/4pybpnhy

DOI : https://doi.org/10.5281/zenodo.10077416

Abstract : Fifty ditch cuttings from Kombo-001 well were sampled and analysed for their palynological content in order to determine the palynostratigraphy, Palynozonation and depositional systems in Kombo-001 well. The study followed standard sample lithologic descriptions and palynological sample preparation using the non-mineral acid method of palynological sample preparation. The sample description which were presented as lithological log, sand/shale ratio and gradational profile showed alternation of sand and shale characteristic of the Agbada Formation in the Niger Delta. The palynomorphs identified in Kombo-001 well are abundant and diverse including gymnosperm and angiosperm pollen, pteridophyte and bryophyte spores, dinoflagellates, foraminiferal test linings, freshwater algae, dinocysts, diatom and fungal spores. The palynoforal assemblage consists of 45 (forty-five) pollen species representing 37 (thirty-seven) pollen genera, 18 (eighteen) pteridophyte and bryophyte spore species which comprise of monoletes, triletes and alete, and few fungal spores, freshwater algae and diatoms. The palynostratigraphy of Kombo-001 well indicated dominance in mangrove pollen species suggesting deposition within coastal to marginal marine settings under wet climatic condition. The palynological zones identified included P820 and P830 with boundary marked based on Quantitative Base Occurrence of Stereisporites sp. at 9110 ft and corresponding to late Miocene. Generally, the depositional systems and systems tract of the studied intervals in Kombo-001 well lies within the highstand systems tract (HST).

Keywords : Palynostratigraphy, Palynozonation, Depositional Systems, Systems Tract, Mangrove Pollens.

Fifty ditch cuttings from Kombo-001 well were sampled and analysed for their palynological content in order to determine the palynostratigraphy, Palynozonation and depositional systems in Kombo-001 well. The study followed standard sample lithologic descriptions and palynological sample preparation using the non-mineral acid method of palynological sample preparation. The sample description which were presented as lithological log, sand/shale ratio and gradational profile showed alternation of sand and shale characteristic of the Agbada Formation in the Niger Delta. The palynomorphs identified in Kombo-001 well are abundant and diverse including gymnosperm and angiosperm pollen, pteridophyte and bryophyte spores, dinoflagellates, foraminiferal test linings, freshwater algae, dinocysts, diatom and fungal spores. The palynoforal assemblage consists of 45 (forty-five) pollen species representing 37 (thirty-seven) pollen genera, 18 (eighteen) pteridophyte and bryophyte spore species which comprise of monoletes, triletes and alete, and few fungal spores, freshwater algae and diatoms. The palynostratigraphy of Kombo-001 well indicated dominance in mangrove pollen species suggesting deposition within coastal to marginal marine settings under wet climatic condition. The palynological zones identified included P820 and P830 with boundary marked based on Quantitative Base Occurrence of Stereisporites sp. at 9110 ft and corresponding to late Miocene. Generally, the depositional systems and systems tract of the studied intervals in Kombo-001 well lies within the highstand systems tract (HST).

Keywords : Palynostratigraphy, Palynozonation, Depositional Systems, Systems Tract, Mangrove Pollens.

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