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THE MFAMOSING LIMESTONE IN SE NIGERIA: OUTCROP‐SUBSURFACE CORRELATION AND RESERVOIR DEVELOPMENT
Author(s) -
Reijers T. J. A.
Publication year - 1998
Publication title -
journal of petroleum geology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.725
H-Index - 42
eISSN - 1747-5457
pISSN - 0141-6421
DOI - 10.1111/j.1747-5457.1998.tb00796.x
Subject(s) - geology , siliciclastic , outcrop , carbonate , progradation , marine transgression , shoal , paleontology , geochemistry , sequence stratigraphy , carbonate rock , sea level , geomorphology , facies , sedimentary rock , oceanography , materials science , structural basin , metallurgy
Key sequence‐stratigraphic markers define intervals recognised in outcrops and wells in the Aptian‐Albian Mfamosing Limestone Formation in SE Nigeria. These markers aid in outcrop‐to‐subsurface correlation. The influx of siliciclastics and sea‐level fluctuations controlled carbonate production. Peritidal, lagoonal and reefal carbonates rim the igneous Oban Massif and reflect an initial relative sea‐level highstand. Subsequent sea‐level fall was accompanied by the progradation of carbonates away from the exposed, siliciclastic‐shedding hinterland, and maximal carbonate production took place during a sea‐level lowstand, when an open‐marine carbonate shelf and a mixed carbonate‐siliciclastic shoal co‐existed side by side. In the Ituk area, wave action abraded the sea floor which was occasionally exposed, and hardgrounds and leached horizons were formed. Bed‐ andmatrix‐selective dorag dolomitisation improved the reservoir potential of the carbonates in certain intervals.