Analysis of the results has reportedly been complicated because of the loss of drilling mud, seawater and remedial cement.
BG is continuing analysis of the well data and will create a forward-plan for the area using the results.
Pancontinental chief executive Barry Rushworth said this was a significant result for the region.
“We encountered a thick and effective seal over the top of the reef, which was an initial risk for us, and the regional follow-on implications of this are truly significant,” he said.
“Porosity, permeability and seal for the reservoir were all better than Pancontinental expected.
“Now that we know there is a prospective oil system in the Lamu basin and we know the important technical details, we are in a prime position to explore for larger volumes of oil over our very extensive portfolio of prospects and leads.”
Sunbird-1 was plugged and abandoned in according with the drilling programme.
Joint venture partners will now discuss follow-up exploration activities in light of the Sunbird-1 discovery.