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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 64 (1980)

Issue: 5. (May)

First Page: 672

Last Page: 672

Title: Petroleum Prospects of Anambra Basin, Southern Nigeria: ABSTRACT

Author(s): A. A. Avbovbo, E. O. Ayoola

Article Type: Meeting abstract

Abstract:

The Anambra basin occupies an area of about 40,000 sq km in southern Nigeria. Twenty-one exploratory wells have been drilled in the basin between 1952 and 1974. None tested formations older than lower Turonian. Five of the exploratory wells discovered gas while only one well encountered oil. These discoveries indicate that the basin is dominantly a gas-condensate basin. Because of plans to build an LNG plant in the neighboring Niger delta, an intensive exploration must be carried out in the basin to determine the gas reserves which can be tied into the proposed Niger delta LNG.

About 5,000 m of sediments ranging in age from Aptian(?) to Miocene are exposed in the basin. The sediment distribution consists of shales and limestones in the central part of the basin which grade into coarse-grained sandstones in the northwestern and eastern flanks of the basin.

Evaluation of wells drilled shows that the basin is most prospective where peripheral sandstones interfinger with or are overlain by shale units. Future exploration efforts should be concentrated on Turonian and Maestrichtian objectives which show good sand development beneath the zone of freshwater flushing.

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Copyright 1997 American Association of Petroleum Geologists