Planktic Foraminiferal Biostratigraphy of A, B, C, D Wells, Offshore Niger Delta, Nigeria
Ajayi, Eunice Omozusi; Okosun, Edward Agboneni

Planktic Foraminiferal biostratigraphy was carried out in four wells drilled in the deep offshore area of the Niger Delta. Four hundred and fifty three ditch cutting samples from A,B,C,D wells were processed and analysed, in order to establish the age, biozones and correlation of the studied sections. Fourty-two planktic foraminiferal species were recovered from the four wells. Three planktic foraminifera zones were identified: Globorotalia margaritae margaritae subzone (N18), Globigerinoides obliquus extremus - Sphaeroidinellopsis seminulina zone (N17), and Globorotalia acostaensis acostaensis zone (N16), following the zonation schemes by Blow (1969, 1979) and Bolli and Saunders (1985) based on foraminiferal marker species whose stratigraphic ranges are well established globally and in the Niger Delta Neogene. The studied wells penetrated a sedimentary succession of Late Miocene to Early Pliocene age. The analyzed sections of the wells are composed of deepwater sediments deposited in the upper to lower bathyal environments.

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