What does NMA stand for

Yes, you are correct. Only Sec 18 has anything to do with the two existing Tap Rock Black Marlin wells.

In fact, only the eastern half of your Sec 18 has anything to do with the two existing wells. Those wells are dedicated to a 320 acre strip that is 2 miles long and 1/4 mile wide down the Eastern edge of Sec 18 and 19. IMO, it’s helpful to know what acreage is dedicated to wells so you know how much of your acreage is dedicated to those wells, so you can make sense of what % you should/are getting paid.

You can go to NMOCD and look at a plat in the well file or else look up the acreage description in the permitting section. See some info below that may be helpful, may be confusing. But essentially you should own equal interests in four 320 acre strips. Two going north into Ameredev Par Three territory, two going south into Tap Rock Black Marlin unit. The E/2 of Sec 6/7 and Sec 18/19 respectively. These existing wells are in one of those 320 acre strips.

It looks like Tap Rock has started drilling more Black Marlin wells. And Ameredev submitted permit applications to the Feds for sections 6/7. So things should be looking up longer term.