This chart shows the supply costs in C$ per gigajoule for the Duvernay Shale’s marketable gas resource. There are four sets of two curves. Each set represents a year from 2015 to 2018. The pairs in each set represent fixed oil prices of C$60 per barrel and C$70 per barrel. Supply costs are progressively lower with each year. Costs based on C$60 per barrel oil are slightly higher than $70 per barrel oil in each pair. Each cost curve gradually rises until it nears the 72 Tcf area. At this time the curve becomes much steeper as it approaches the total amount of marketable gas available of 76.6 Tcf. Source: NEB.