Comstock Resources is in talks to purchase Chesapeake Energy Corp’s Haynesville shale assets in Louisiana, according to Reuters, who cited sources familiar with the matter.

If the companies can come to a concrete agreement, the deal could be worth more than $1 billion. At this time, Comstock and Chesapeake have settled on a basic structure for a potential deal and hope to reach an agreement by the end of the year.

Reuters sources declined to be identified as talks of the deal are confidential and what has been agreed upon is subject to change. There is no guarantee these talks will end successfully.

Learn more: Reuters > Exclusive: Comstock in talks to buy Chesapeak’s Haynesville assets – sources