AKPABIO I. O
University of Uyo
Title: Rock attributes analysis for enhanced Reservoir fluid and lithology discrimination: Case study of a niger delta basin
Biography
Biography: AKPABIO I. O
Abstract
Elastic properties of rocks have been derived from well logs and 3D pre-stack seismic data from Onshore Niger Delta through rock physics modelling and LamdaMuRho (LMR) seismic inversion and analysed to map hydrocarbon bearing sands and the different fluid types trapped in them. P-impedance, S-impedance, Vp/Vs ratio, porosity, LamdaRho (λρ) and MuRho (µρ) were derived from well logs using appropriate relations. LMR inversion of the pre-stack seismic data was also carried out to generate Acoustic Impedance, Shear Impedance and Density volumes. These rock parameters were analyzed in cross-plots space and used to determine which of them constituted better indicators of pore fluids and lithology. Data slices of the elastic rock parameter volumes were then used to study the characteristics of the identified hydrocarbon bearing intervals. The identified reservoirs of interest for wells A, B, C and D are HD 9000, GC 7100, HD 2000 and HD 5000 respectively and their corresponding depths range from 6816 to 7356.86ft, 5538.60ft to 5930ft, 5842.8ft to 6028.34ft and 5838ft to 6051.5ft respectively. Results also showed that the cross-plot of LambdaRho versus MuRho from all the wells yielded best discrimination between fluids and lithology while a similar cross-plot from the inverted seismic volume validated the results from the wells.