Looks like the headquarters of the merged companies will be in OKC.
Chesapeake Energy Corporation, Southwestern Energy To Merge; OKC To Be Headquarters
https://www.news9.com/story/659fd8675e0a905bd81bc6f6/chesapeake-energy-corporation-southwestern-energy-to-merge-okc-to-be-headquartered
Chesapeake Energy Corporation, Southwestern Energy To Merge; OKC To Be Headquarters
https://www.news9.com/story/659fd8675e0a905bd81bc6f6/chesapeake-energy-corporation-southwestern-energy-to-merge-okc-to-be-headquartered