Expert systems have been applied to the identification and use of microfossils in petroleum industries. Expert systems are also applied in evaluation of energy resources, widely used in Engineering Geology and Geophysics especially in areas of seismic data evaluations,Interpretation of Geological signals, and drill site evaluation and Geological survey. More so, Expert Systems would find their true home in Geological applications in aiding the complex multidisciplinary evaluation processes typically encountered in areas such as basin studies. More sophisticated expert systems software and its interfacing with spatial databases are required to attempt such tasks. Expert Systems have been applied on map contouring, mineral resources identification, rock identification as well as mineral exploration and mining .