Calcareous Nannofossil Biostratigraphy of XY-1 Field,Offshore Western Niger Delta, Nigeria

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Author(s) S. O. Obaje | E. A. Okosun | P. I. Olasehinde | E. E. Udensi
Pages 285-291
Volume 3
Issue 5
Date May, 2014
Keywords Calcareous nannofossils, biostratigraphy, XY-1 Field, offshore western Niger Delta, Nigeria

The scope and objectives of the research study involved the following: the identification of calcareous nannofossils and their abundance in the strata penetrated in the wells, calcareous nannofossil biozonation of the wells intervals, determination of the ages of the studied well depth intervals and the correlation of the five wells in the study area. The area of study is located in the offshore XY-1 Field of the offshore western Niger Delta area of Nigeria. Niger Delta lies between latitudes 4° and 6° N and longitudes 3° and 9° E in the south-south geo-political region of Nigeria. A total of 1,100 ditch cutting samples were collected from five wells at the industry standard of 9.14 m depth intervals. The pipette and smear laboratory technique was used for the calcareous nannofossils preparation. The identified calcareous nannofossil assemblages were used for biostratigraphic interpretation. Three calcareous nannofossil biozones were identified and they are Calcidiscus premacintyrei (Zone NN6-NN7), Catinaster coalitus (Zone NN8) and Discoaster hamatus (Zone NN9). The biozones were used for the correlation of the five wells. These biozones are indicative of Middle to Late Miocene age for the well depth intervals. The biostratigraphic interpretation of these wells is useful for mapping subsurface horizons in the offshore western Niger Delta area of Nigeria.

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