NET-SAND ESTIMATION USING SEISMIC ANISOTROPY MODELING IN THE CENTRAL NIGER DELTA Page No: 4733-4746

By: God\\\'swill I. Alaminiokuma and Jonathan I. Omigie

Keywords: Niger Delta, Kolo creek field net-sand, seismic anisotropy, eta cube, shale volume

Abstract: Net-sand was estimated using seismic anisotropy modelling in the Central Niger Delta. Gamma ray Logs, Pre SDM and PSDM seismic data from Kolo Creek Field were analyzed. A correlation of Hockey stick effects and seismic eta values which vary laterally with geologic surfaces confirmed the presence of anisotropy within the Field. Seismic eta cubes were generated along 11.5MFS, 12.1SB, 12.8MFS, 13.1SB, 15.0MFS, 15.5SB, 15.9MFS and 16.7SB geologic surfaces each having interval thickness lying between 150 to 250 m. Volume of shale, Vs calculated from Gamma ray logs was cross-plotted with seismic eta, ? values derived from seismic anisotropy processing. Results obtained showed that a linear relationship exist between eta, ? and volume of shale, Vsh. This was then used to estimate the interval net-sand of the region for which eta cube has been obtained. The results obtained were consistent with predictions made by other researchers using different methods. This study is useful for accurate estimation of the total volume of sand of a reservoir and is also essential for estimating the amount of hydrocarbon in place and also allows for proper additional placement of wells to optimally drain a reservoir.



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