Unproved reserves which analysis of geological and engineering data suggests are less likely to be recoverable than probable reserves. When probabilistic methods are used, there should be at least a 10% probability (P10) that the quantities actually recovered will equal or exceed the amount of estimated reserves. Also often referred to as P3. Possible reserves may include: (1) reserves that based on geological interpretations could possibly exist beyond areas classified as probable; (2) reserves in formations that appear to be petroleum bearing but may not be productive at commercial rates; (3) incremental reserves attributed to infill drilling that are subject to technical uncertainty; (4) a project is planned but is not yet in operation or there is a reasonable doubt that it can be developed commercially, (5) reserves would appear to be structurally lower than the proved area