Sections 23 and 15 have shallow production that is quite old-23 started in 1920s. If you are receiving royalties, then you are held by your (or your ancestor’s) earlier lease or pooling. Are you getting the royalties? If not, investigate. 15 & 23 are both in the Tatums Field Unit. Many, many wells have been drilled there.
Your property in TX has vastly different reservoirs with completely different economics.
This part of Carter County has a developing deeper Woodford shale horizontal play which is why you are getting offers to buy. Your section 15 has a permit for a Saltwater disposal well which is a hint that horizontal drilling may be coming for your area.