Integration of Petrophysical and Rock Physics Analysis for the Characterization of M-Field of Niger Delta Basin

Abstract

M field is located in deep offshore Nigeria, in water depths ranging
from 1110m to 1750m. Predicting lithologies and pore fluid
accurately is very important in petroleum prospecting and reservoir
characterization. The purpose of this work is to carry out
characterization of M-field in terms of fluid content and lithology by
integrating petrophysics and rock physics analyses. This involves
carrying out rock physics analysis in order to understand elastic
parameters relations with velocities and impedances of the M field.
Cross plots were used to understand the rock behavior that better
discriminate the reservoir. Cross plots of acoustic p-wave velocity
(Vp) versus Acoustic impedance (AI) are useful to characterize the
reservoir more confidently. While cross plot of Vp/Vs against AI is
useful for discriminating between the fluids. Analysis was carried
out on two reservoirs, Res1 and Res 2. It was observed that the three
wells considered for this study encountered both oil sands and water
sands. By integrating petrophysics and rock physics analysis the
lithology and fluid scenarios can be predicted accurately.