Michigan's Antrim Shale boom happened before a lot of today's owners were even paying attention to their mail, and thirty-plus years later most of those wells are still out there, still paying, still on the same long slow decline they've been on for two decades.
The Antrim Shale play across northern lower Michigan — Otsego, Antrim, Montmorency, and the surrounding counties — took off in the late 1980s and through the 1990s, using a shallow coalbed-style gas play years before shale drilling became a household term in Texas and Pennsylvania. It's a low-pressure, biogenic gas play, meaning the gas formed from bacterial action on organic material rather than deep heat and pressure, which gives it a very different production personality than a Haynesville or Marcellus well.
That personality means slow, steady decline rather than the sharp early drop-off you'd see in a modern shale well. A lot of Antrim wells drilled in the 1990s are still producing today at a fraction of their original rate, and owners who've held these interests for decades have generally seen a long, gradual taper rather than any dramatic swings tied to well performance itself.
Biogenic Antrim gas production comes with real water volumes, especially in a well's earlier years, and dewatering costs show up on statements from older Antrim wells even now, decades in. The gathering systems built to handle this production date back to the original boom, and running costs on infrastructure that age can take a real bite out of the net number compared to gross wellhead pricing you might see quoted for Michigan generally.
Because the play is dry gas with essentially no natural gas liquids revenue to lean on, your check moves with gas price directly, the same way a Fayetteville or Antrim-adjacent play would, without any liquids cushion softening the swings. That direct exposure is worth understanding before you assume a low check means the well is failing rather than simply reflecting a soft gas market that month.
A well drilled in 1992 has likely seen its royalty interest pass through at least one, often two generations of family ownership since then, and Michigan probate records on rural northern-county land don't always keep pace cleanly with who actually holds what fraction today. It's common for us to find an interest listed under a name that's been deceased for years, with heirs who never formally updated county records because the checks kept arriving regardless.
That's not a dealbreaker for a sale, but it does mean title work matters more on a legacy Antrim interest than it would on a freshly leased tract, and we build that research into how we put an offer together. We've closed deals where the paperwork hadn't been touched since the well was first drilled, and it just took a little extra time to sort out the current heirs.
With this much production history — often twenty-five or thirty years of real data — we're working from a genuinely reliable decline curve rather than a projection. That lets us price a legacy Antrim interest with more confidence than we'd have on a newer, less-proven play, even though the absolute volumes involved are typically modest by modern shale standards.
If your family has been collecting a small, steady Antrim check for decades and you're weighing whether the remaining years of production are worth more to you now as a lump sum, that's exactly the kind of decision we can price honestly against real numbers rather than guesswork.
Antrim is a biogenic, shallow gas play formed by bacterial action rather than deep heat and pressure, giving it a low-pressure production profile with real water volumes and a much slower, more gradual decline than a typical modern shale well.
Antrim wells produce meaningful water alongside gas, especially in earlier years, and water handling costs are a normal deduction on statements from this play even decades into production.
Yes, though it typically requires probate or heirship documentation to establish current ownership. We handle that title research as part of putting together an offer.
Often yes. Decades of real production history give us a reliable decline curve to price against, and a steady, mature stream can still carry real value even at modest current volumes.
Biogenic gas like Antrim's forms from bacterial breakdown of organic material at shallow depth, while thermogenic gas forms from heat and pressure deep underground. The two behave differently in the reservoir, which is part of why Antrim wells decline so much more gradually than a typical shale well.
