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In this paper, composite well log (gamma ray, sonic and density) was used to identify thin layers of different lithologies and the lithologic boundaries at various depths by the signature records of the logs, and checkshot data were used to check and/or validate the integrated time and sonic derived velocities. The results show that acoustic velocities are very much affected by different lithologic properties and depth; porosity decreases more in shale than sandstone and velocity increases more in shale than sandstone all with respect to depth. The result further showed that there was normal parametric trend for both wells from 120m to about 3450m depth beyond which overpressure sets in.

The influence of lithology and depth on acoustic velocities in South-east