--> Northwest Niger Delta Regional Geologic Framework and Chronostratigraphy, by Val Onyia, Adedoja Ojelabi, Elliot Ibie, Unwana Nkeme, Richard C. Haack, Louise Linden, and Joshua Adubiobi; #90037 (2005)

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Northwest Niger Delta Regional Geologic Framework and Chronostratigraphy

Val Onyia1, Adedoja Ojelabi1, Elliot Ibie1, Unwana Nkeme1, Richard C. Haack2, Louise Linden1, and Joshua Adubiobi1
1 Chevron Nigeria Limited, Lagos, Nigeria
2 ChevronTexaco, San Ramon, CA

Integration of 3D seismic and well-log data, high resolution biostratigraphy and geochemical indicators provides an understanding of the geological processes that dominated the formation of the northwestern arm of the Niger Delta basin. Through time, rapid subsidence has been prevalent and a variety of structural and stratigraphic styles have developed.

Over twenty sequence boundaries and chronostratigraphic surfaces have been mapped across the northwestern flank of the Niger Delta, a number of which have been tied to the Global Cycle Chart of Haq et al. (1987). The incision history from the late Oligocene (25.5Ma) to the Pliocene (3.0Ma) has been developed to highlight extent and rates of erosion in this part of the Delta. Shelf edge maps demonstrate the distribution of slope failures through geological time, and transects constructed across the area from different vantage points reveal transitions from shelf to slope facies.

Important outcomes of this regional study include: 1) the ability to predict sand fairways in the northwestern Niger Delta and beyond, 2) correlation of reservoir sands within and among oil fields in the area, 3) recognition of prospective new sand-rich intervals in unexploited areas near developed fields and facilities, 4) and finally, development of a chronostratigraphic chart which is applicable to a large portion of the western Niger Delta.