Houston-based W&T said it plans to contest the fine.

The civil penalty from the Office of Natural Resources Revenue (ONRR) stems from what the Interior Department unit deemed "inaccurate" royalty reports that included "improper transportation cost deductions" on its Section 6 leases in the Gulf of Mexico.

"The Section 6 leases at issue do not allow transportation deductions for oil from royalty payments," ONRR said in a statement on Thursday.

“Accurate