BIOCHRONOLOGICAL CORRELATION AND STRUCTURAL INTERPRETATION OF ‘X’ AND ‘Y’ FIELDS, CENTRAL DEPOBELT, NIGER DELTA, NIGERIA

The objective of this paper is to present stratigraphical results in a new developing trend by using bio chronological datum/events in carrying out correlation of five wells belonging to the ‘X’ and ‘Y’ field in the Niger Delta. High impact biostratigraphic interpretation of the wells was undertaken utilizing events/biozones, wireline log motifs, maximum flooding surfaces as well as the absolute ages. These results were further correlated to the third order cycles in other to establish a regional sequence stratigraphic framework of the studied area. When the interpreted datum was employed in the correlation panel across the wells however, possible fault displacement was observed with varying thickness. The correlation of these five wells within the two fields along the strike direction showed that the juxtapositioning of wells - ‘B’, ‘C’and‘E’ exhibited a distinctive fault throw with the following average displacements, thus wells -‘BC’ showed about 394m with well - ‘B’ on the up-thrown side relative to well - ‘C’; wells - ‘CA’ - 415m with well - ‘A’ on the up-thrown side relative to well - ‘C’; wells - ‘AE’ - 345m with well - ‘E’ on the down-thrown side relative to well - ‘E’. Furthermore, well - ‘D’ which is situated in the up-dip section showed a high fault-throw value with wells - ‘ED’ - 413m average displacement relative to well - ‘E’. As a result of this, it was further deduced that wells - ‘C’ and ‘E’ are on the down-thrown side relative to the correlative events and surfaces encountered in wells - ‘A’, ‘B’ and ‘D’.