Mae nifer o greigiau yng Nghymru a allai gynnwys nwy wedi'u nodi yn yr astudiaeth, ond dim ond drwy archwilio ac ymchwilio ymhellach y gellir asesu'r adnodd posibl sydd ar gael.
A number of geological horizons in Wales that might be prospective for gas are indicated in the study, but an assessment of the potential resource is only possible through further exploration and research.