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Laboratory estimation of aquifer effective porosities from core samples obtained during borehole drilling in parts of The Niger Delta Region, South-South, Nigeria

George, N.J., Obianwu V.I. and  Obot.

In this work, twenty-three core samples of aquifer units constituting fine sand, medium grained sand and gravelly sand were used to estimate the effective porosities in different locations covering ONN, EK and NSI of the southern part of Akwa Ibom State. Effective porosities have been found to range from 2.75 to 40.08% with an average of 23% approximately at the end of the laboratory analysis. The increases in porosities were found to prograde northeast of the entire study area indicating the orientation of high void to volume of sample ratio.