* Faults must connect to permeable beds higher in the section or to the surface to leak significant amounts of petroleum. If [[growth fault]]s die upsection into a shale interval, leakage may be minimal except where natural hydrofracture ruptures seals (p. 11–17). | * Faults must connect to permeable beds higher in the section or to the surface to leak significant amounts of petroleum. If [[growth fault]]s die upsection into a shale interval, leakage may be minimal except where natural hydrofracture ruptures seals (p. 11–17). |