Tullow announced in March its Ngamia-1 prospect in Nigeria encountered more than 65 feet of net oil pay. Once deepened by roughly 1,650 feet, however, the company said the total pay for the prospect is greater than 325 feet across multiple reservoir zones.
"Many leads and prospects similar to Ngamia have been identified and following this discovery the outlook for further success has significantly improved," the company said in a statement.
Ngamia is the first prospect tested by Tullow during its extensive drilling campaign planned for Kenya and Ethiopia.
Tullow said it aims to petition the Kenyan government to increase seismic surveys on top of its drilling campaign in the region.
The company said it plans to drill Ngamia-1 to a depth of around 8,800 feet.
"We now look forward to the drilling and evaluation of the deeper potential of this well and the acceleration of our seismic and drilling campaigns in the region," Exploration Director Angus McCoss said in a statement.