It is helpful to read the aliquots from right to left. So look for the SE4 and then the East Half of the that quarter section. You have what is called a “standup” 80 acres. You may only have a smaller net acres within the section. Leases often only describe the gross acreage.
If you are getting offers to buy, it is because there are rigs on site drilling horizontal wells through 18/19/30/31. The spacing of those wells will include your 80 acre description. If it were me, I would not sell…