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Paper Number: 131

Well log sequences stratigraphy and potential reservoirs of wells KF-1and KF-2; Kribi oil field, Douala-Kribi-Campo Basin, Cameroon.

N. L. Takem¹, C. M. Agyingi ² and N. N. Blaise²

¹Pan African University institute for Life and Earth Science including Health and Agriculture, University of Ibadan. Ibadan Nigeria, lionadotk2@gmail.com

² University of Buea, Cameroon.

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An integrated interpretation of wireline logs and lithology of two selected wells (KF-1 and KF-2) of Kribi oil field within the south eastern offshore Douala/Kribi Campo Basin [1], was carried out for sequence stratigraphic analysis of sediments penetrated by the wells [2]. The stratigraphic units within the wells were subdivided into depositional sequences using characteristic well log patterns that were deposited between Tertiary Miocene to lower Cretaceous.

Nine (9) and eight (8) depositional sequences were identified respectively for KF-1 and KF-2. The sequences comprise LST (progradational packages), TSTs (retrogradational packages) and HSTs (aggradational packages), which reflect depositional systems deposited during different phases of base level changes [3]. The (LST) consists of Basin Floor Fans (BFF), Slope Fans and Channel Sands deposited when sea level was low and accommodation space lower than rate of sediment influx. TST consists of retrogradational marine shales deposited during high relative sea levels and when accommodation space was higher than rate of sediment influx [4]. HST consisted of shoreface sands displaying mostly aggradational to progradational stacking patterns.

The rapid facies changes between successive systems tracts provide potential stratigraphic traps. Reservoir stratification and continuity vary greatly between systems tracts and this enhanced development of stratigraphic traps in the area.

References:

[1] B.M. Abbot, J.W Walker, J.A. Prissorsky, (1978): An evaluation of the Douala Permit, Cameroon, as an aid to the 1978 relinquishment. HTSC Rept. no. 442A 1822, 25 p.

[2] A.K. Adegoke, (2012): Sequence Stratigraphy of Some Middle to Late Miocene Sediments, Coastal Swamp Depobelts, Western Offshore Niger Delta Volume 2 No.1, ISSN 2224-3577.

[3]M.E Brownfield, and R.R Charpentier, (2006): Geology and Total Petroleum Systems of the West-Central Coastal Province (7203), West Africa. U.S. Geological Survey, Reston, Virginia, Bulletin 2207-BU, p.52.

[4] M.J. Ntamak-Nida, S. Bourquin, J-C. Makong, F. Baudin, J.E Mpesse, and C. Itjoko, (2010): Sedimentology and sequence stratigraphy from outcrops of the Kribi- Campo sub basin: Lower Mundeck Formation (Lower Cretaceous, southern Cameroon. Journal of African Earth Sciences, 58, 1–18.