THE SEDIMENTOLOGY, SEQUENCE STRATIGRAPHY, AND FLUID MIGRATION HISTORY OF NON-MARINE AND SHALLOW MARINE RESERVOIRS, NORTH OF APOI-FUNIWA FIELD, OFFSHORE NIGER DELTA
Published:December 01, 1997
G.D. WACH, M.W. HOFFMAN, O. OGUNYOMI, S. OLEAR, E.L. COLLING, T.L. FRITZEL, P. RUSSO, 1997. "THE SEDIMENTOLOGY, SEQUENCE STRATIGRAPHY, AND FLUID MIGRATION HISTORY OF NON-MARINE AND SHALLOW MARINE RESERVOIRS, NORTH OF APOI-FUNIWA FIELD, OFFSHORE NIGER DELTA", Shallow Marine and Nonmarine Reservoirs: Sequence Stratigraphy, Reservoir Architecture and Production Characteristics, Keith W. Shanley, Bob F. Perkins
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The North Apoi-Funiwa field comprises Pliocene and Miocene non-marine and shallow marine sediments offshore of the central Niger River delta. The major sequences, or delta cycles, are controlled by progradation and retrogradation of the Niger delta. Depositional environments of the minor sequences occur on a reservoir scale and comprise a complex mix of shoreface, estuarine, fluvial and delta plain deposits. Sediments deposited along the unstable progradational Niger delta complex were subject to syndepositional slumping and faulting which contributed to field compartmentalization and apparent reservoir heterogeneity.
The field has 7 to 8 producing intervals with reserves of 500-600 Mbo. Enhanced reservoir production can be achieved through rigorous stratigraphic definition of the reservoir intervals within the complex structural overprint. Reservoir compartmentalization and connectivity were defined through detailed core description of physical and biogenic sedimentary structures, well log analysis, and sequence stratigraphic correlation. This provided the framework for geochemical modeling of hydrocarbon migration and entrapment of fluids within reservoir intervals.