The Educational Technology Unit at Karolinska Institutet (KI) in Sweden has developed an on-screen simulation software, SvalSim, that simulates field work for problem-oriented learning in petroleum geology. The system is using numerous authentic geological data, takes the time aspect into account and lets users control almost all events resulting in a very realistic simulation. The educational setting for use of the simulation software is general training in geosciences and field courses in Norway e.g., at Svalbard. This article describes the system and the pedagogical objectives.