Tusc-county-man, Wow haven't heard that name in a while. They sold to Chevron who renewed the leases but then sold them to Pin Oak and EQT who let many of the leases expire. EAP/Encino then came in and has been leasing most of the area that Sierra Buckeye initially leased. Also many offers to buy minerals leased or not. Why are you asking? Are you hoping to get leased? Has anyone contacted you? What township are you in?
Tusc county man, I don't know anything about EOG but looking them up they seem to be a drilling company. So an oil and gas company who has now leased or bought leases probably hired them. It could be EQT or Pin Oak that hired them. So who is holding your upper formation now? They may be able to tell you
Tusc county man, Glad you got your answer. That right I do recall that CHK as well as Chevron got a lot of the leases from Sierra Buckeye.