Establishing Sand Body Continuity Using High Resolution Sequence Stratigraphic Analysis in Agbada Field, Niger Delta, Nigeria

Abstract

This study developed a sequence stratigraphic framework for Agbada Field. Field wide correlation gives an insight into stratigraphic succession of the field which is the typical sand/shale alternation of the Agbada Formation. This correlation was integrated with biostratigraphic data. The major maximum flooding surface (MFS) is the 15.9 Ma, Chiloguembelina-3 which was interpreted in the thick shale interval above the D1.0 reservoir. The other undated maximum flooding surface (MFS) lies below the D4.0 sand. The sequence boundary lies at the base of D3.0 reservoir. There are three systems tracts interpreted in the intervals of interest; a basal highstand system tract (HST) above which we have a Sequence Boundary and overlain by a Lowstand System tract (LST) above which there is a transgressive surface which signalled the onset of the Transgressive System Tract (TST) that completed the end of the cycle. Parasequence correlations revealed the continuity of sand units which give an indication of the lateral continuity of sand bodies and the potential trapping and retention capabilities which would help in infill drilling plans to maximally exploit the reservoirs.