Yes and No. Here is an excerpt from the Oil and Gas Act: "the grant of a petroleum retention licence in respect of such of the blocks as the licensee satisfies the Minister contain a gas field or a part of a gas field or, for the better administration of petroleum activities, should be included in a petroleum retention licence."
For example PRL 15 contains 9 blocks, all of them do not contain gas.
For example PRL 15 contains 9 blocks, all of them do not contain gas.

