SEISMIC ATTRIBUTES OF BETTA FIELD, ONSHORE NIGER DELTA, SOUTHERN NIGERIA

Abstract

The evaluation of the seismic attributes of BETTA Field, Onshore Niger Delta, Southern Nigeria using 3D-seismic data was undertaken. Six shale and five reservoir sand units were identified. All of these units were penetrated by three wells. The results revealed that the rock properties are variable and are controlled by environments of deposition during Oligocene – late Miocene. The Shales had high acoustic impedances, high transmission coefficients and low reflection coefficients compared to sands. The Seismic attributes analysis also revealed rock properties in terms of fluid content and depositional environments with moderate - high amplitude and strong reflection strength with continuity being continuous to chaotic and truncated by faults. From seismic attributes and gamma log motif, depositional environments of fluvio-deltaic plain, deltaic front and open shelf margin are inferred. The oil and gas yield of the field is high and can be exploited at profit.