This technical report describes the technical evaluation work conducted on the Okoki structure in Shell Exploration NZ Limited's PEP 38459. Previous exploration and production well drilling in the adjacent Pohokura Mining Permit are investigated in reference to the Okoki structure. There is significant uncertainty surrounding potential in-place volumes as Okoki-1 well did not intersect a fully saturated hydrocarbon column. The volumes have therefore been calculated probabilistically using a base structure map. Finally development scenarios are discussed.