Automatic History Matching Theory, Implementation, and Field Applications

History matching (HM) is a mandatory step for any reservoir simulation study. Without a proper history match, a reservoir simulation model may lose credibility, or even worse, may lead to erroneous conclusions. HM is typically approached by reservoir enginners (RE) using a trial and error method, but there is a new, more advanced methodology known as computer assisted or automatic automatic history matching. Although assisted HM technology is well developed, its acceptance in the RE community has been slow. This paper aims to explain the concepts in a simple manner and suggest practical tips to make it easier for a practitioner to use automatic HM technology properly.