Integration of 3D Seismic and Well log Data In the Optimal Reservoir Characterisation of EMI Field, Offshore Niger Delta Oil Province, Nigeria

Abstract

Seismic and Petro-physical evaluation of EMI field revealed typical structural features of the Niger Delta, namely the roll over anticlines and growth faults with a promising good hydrocarbon accumulation. The extensive faults F2, F3 and F4, which were structure building faults, support suspected hydrocarbon prospects (P2 and P3) which could be explored in the future. The deeper of the two horizons mapped in this study, have better structures for hydrocarbon accumulation with supporting growth faults. The shallower horizon, H1 does not have any faults intersecting it. The two horizons marked the tops of reservoir sands in the field and they both correspond to sequence boundaries as observed on the seismic sections. The Petro-physical values – the Porosity, Net to Gross, Water saturation, Hydrocarbon saturation that were calculated from the POWERLOG software, were almost ideal for the Niger Delta reservoir sands with average porosity values of 0.25, water saturation of 0.42 and average Net to Gross value of 0.85. The lower the water saturation, the higher the hydrocarbon saturation in the reservoir sand, and also the higher the net to gross value, the higher the hydrocarbon saturation.