undergraduate, recomend a software to start

Hello.
i Study geology and while im still studying i want to learn how to work on some software related with mining, petroleum, stratigraphy, and those things.
i know how to work on ENVI, Photoshop, AutoCad and ArcGis. i want to learn how to work in a software widely used in the geologic world.

i have seen some like petrel, --- ------- suite, oasis montaj, omni, vista, rockworks, vulcan.
please recommend me some to start with.

thanks, sorry for my english