$1,000/ac in your area seems mighty low to me. As a rough measure, the Texas GLO is having a fairly routine O&G Lease sale on October 8, 2019, as follows:
GLO Sealed Bid O&G Lease Sale - October 8, 2019 #MGL 50 - E/2 SEC 43 BLK 72 PSL, 320 acres, A-4615 Minimum Bid $4,000/ac 3-Year Term, 25% RI
That half-section is 3.5 miles SW of you. Of course, 5 nma has something to do with worth… and no one has offered $4,000/ac yet… we shall see.