Give us some details.
So you inherited about 0.16 acres of oil and gas interest. You should team up with other family members. They should have been approached, too. You can get better terms, and maybe a better bonus if you do. If you want to go crazy with genealogy, you can trace all of your great-grandpa's descendants and team up with them. That will take a huge amount of time, though. I know because I used to work as a landman.
Whatever you do, make sure to get a No Warranty of Title clause, and and Indemnification clause. Those will help to protect you from future legal issues. Not that anyone can predict what will happen in the future, but those clauses will certainly help.