“…In this case, the process of considering the optional wells can be repeated after additional data have been collected. In this manner, the staged approach allows the mitigation of the downside risk, which could reduce the economic value of the project if the company commits to drill all the wells before actually starting to produce the field (Willigers et al, 2017). This phenomenon is particularly relevant for marginal fields, in which drilling costs may represent a large part of the capital expenditure and highly influence the overall value of the project.…”