200million barrel onshore poss 50 plus bagger, page-66

When temperatures of the organic-rich sedimentary rocks exceed 120oC (250oF) the organic remains within the rocks begin to be "cooked" and oil and natural gas are formed from the organic remains and expelled from the source rock. It takes millions of years for these source rocks to be buried deeply enough to attain these maturation temperatures and additional millions of years to cook (or generate) sufficient volumes of oil and natural gas to form commercial accumulations as the oil and gas are expelled from the source rock into adjacent reservoir rocks. Oil and gas formed in this manner are referred to as THERMOGENIC OIL AND GAS.

"Kate Prospect is a 15 sq. km mound that plays host to a number of thermogenic oil seeps at the surface, along its perimeter" TAG

ie. The oil and gas that has migrated to the surface around the perimeter of the anticline trap is THERMOGENIC ie.is generated from cooking of late creataceous source rocks and migrated(seeped to the surface). Trapping is the key and is why the combination of oil seeping to the surface and a large surface anticline trap is so highly regarded.
DYOR DYOR DYOR