Kirkland & Ellis and Thompson & Knight represent GEP Haynesville in its pending $850 million purchase of Haynesville Shale assets from subsidiaries of Calgary-based Encana Corp., which turned to Gordon Arata McCollam Duplantis & Eagan.

Energy producer Encana announced on Aug. 25 that its wholly owned subsidiary Encana Oil & Gas (USA) had reached a definitive agreement to sell the Haynesville natural gas assets, located in Louisiana, to GEP Haynesville. GEP Haynesville is a joint venture formed by GeoSouthern Haynesville, of The Woodlands, and funds managed by GSO Capital Partners.

The transaction is subject to customary closing conditions, regulatory approvals and post-closing adjustments. It is expected to close during the fourth quarter, with an effective date of Jan. 1, 2016.