In this course, we would like to take a different approach to all the other industry training on the subject and present a practical workflow on how to build a gemodel that can be effectively used for reservoir simulation. We emphasize the practical application of the geomodel for business decisions over the complicated geology or latest software advancements. We go through an entire process of building a geomodel and review multiple case studies for all major depositional environments. A strong emphasis is made on capturing uncertainty at every step of the geomodelling workflow. There is a healthy split between the presentation and exercise parts of the course and all the information presented is directly applicable to your day-to-day activities as a reservoir modeller.