Most boundary and construction survey work deals with a single bundle of rights: whoever holds the deed to the surface controls the property. Oil and gas work breaks that assumption immediately. In most producing states — Texas and Oklahoma especially — the land underneath a tract can be owned by someone entirely different from the person who owns the surface, and the deeds that convey each interest look and behave nothing alike. Here's what actually separates them.
The Core Distinction: Severed Estates
A standard property deed conveys the surface estate — the dirt, and whatever is built on it. Unless the minerals were reserved or previously sold off, a surface deed traditionally carried mineral rights along with it. But minerals can be, and routinely are, severed from the surface: sold, reserved, or inherited separately from the land above them. Once that happens, the surface estate and the mineral estate become two legally distinct properties that just happen to occupy the same coordinates, at different depths.
This means a current owner of the surface may not own a single barrel of oil or cubic foot of gas beneath their own property — and may not even know it, if the severance happened generations earlier and was never mentioned when they bought the land.
The Mineral Estate Is the Dominant Estate
In most oil and gas states, the mineral estate is legally treated as the dominant estate. That means the mineral owner — or more commonly, the company that has leased the minerals from them — has an implied right to use as much of the surface as is reasonably necessary to explore for and produce the minerals, even without the surface owner's consent. Some states temper this with an accommodation doctrine requiring the operator to avoid unnecessary interference with existing surface use, but the underlying legal hierarchy still runs mineral-over-surface.
For survey crews, this is the part that shows up in real fieldwork: a well pad, access road, or pipeline route can move forward on legal authority that has nothing to do with the surface owner's deed — and everything to do with a mineral lease the surface owner may not have signed themselves.
How Each Type of Deed Describes the Land
Property deeds describe a tract using one of two systems, depending on the state: metes and bounds (courses and distances back to a point of beginning) or a PLSS aliquot description (section, township, and range). We covered both systems in detail in our comparison of the two land description systems.
A mineral deed typically describes the samesurface tract using the same method — there's usually no separate lateral boundary for the minerals, since they underlie the identical footprint at depth. What changes is everything layered on top of that description: depth limitations (all strata, or specific named formations only), and a fractional interest rather than a simple boundary. A mineral deed for “an undivided 1/4 mineral interest in and under” a described tract is describing the same ground a surface deed would, plus a fraction that surface deeds never need.
If you're parsing an old deed to figure out exactly what tract is involved — mineral or surface — the Deed Plotter will plot a metes-and-bounds description and calculate closure and acreage automatically. For PLSS-described tracts, the Aliquot Part Calculator does the same for section-based descriptions — both are free and take the description straight from the deed.
Types of Interests: Far More Than a Surface Deed Ever Has
A property deed is comparatively simple: fee simple, an easement, maybe a life estate. Oil and gas introduces a much longer list of distinct interests, each with different rights attached:
| Interest | What it holds |
|---|---|
| Mineral interest | Ownership of the minerals themselves, including the right to lease them for development |
| Royalty interest | A share of production revenue, free of drilling and operating costs, without the right to lease or make development decisions |
| Non-participating royalty interest (NPRI) | A royalty share carved out of the mineral interest, with no right to bonus payments, delay rentals, or leasing decisions |
| Working interest | The operating interest under a lease — bears the cost of drilling and production, and keeps the profit after royalties are paid |
| Overriding royalty interest (ORRI) | A royalty carved out of a working interest, tied to a specific lease and expiring when that lease terminates |
Deed vs. Lease — Two Different Documents People Conflate
Worth separating clearly: an oil and gas deed (or mineral deed) is a permanent conveyance, exactly like a property deed — it transfers ownership outright. An oil and gas leaseis a temporary contractual right: a primary term (often three to five years) that continues indefinitely afterward “as long as oil or gas is produced in paying quantities.” A mineral owner can sell their minerals outright with a deed, or lease the right to develop them to an operator while keeping ownership — the two documents get discussed interchangeably in casual conversation, but they do fundamentally different things.
Net Mineral Acres: A Unit With No Surface Equivalent
Because mineral ownership is so often fractional and inherited across generations, oil and gas title work uses net mineral acres (NMA)to express exactly how much of a tract's minerals a given owner holds. Owning half the minerals under a 100-acre tract is 50 net mineral acres. Owning a 1/4 interest under a 40-acre tract is 10 net mineral acres. Surface acreage has no equivalent concept — you either own the surface or you don't, in whole parcels, not fractional shares layered across a deed history.
Pooling and Unitization
Modern horizontal drilling routinely crosses the boundaries of multiple separate surface tracts in a single wellbore. To make that legal and to fairly compensate every affected mineral owner, interests from all the tracts a well drains get combined — pooled or unitized — into a single production unit, with revenue split among owners in proportion to their acreage within that unit. There is no comparable mechanism in ordinary property law; surface tracts don't get combined this way for any equivalent purpose.
What This Means for Survey Crews in the Field
This isn't abstract property law if your crew works pipeline, well pad, or right-of-way jobs in an oil- and gas-producing state:
- Surface use agreements are separate from surface ownership.A well pad or access road can proceed under a mineral lease the surface owner never signed — understanding who actually authorized the work matters before you're on site.
- Right-of-way and pipeline surveys often need their own metes-and-bounds description carved out of a larger PLSS-described tract, even in states where the underlying land is otherwise described by section and township.
- Title research runs deeperon oil and gas jobs — severed minerals, decades-old leases held by production, and fractional heirship interests all complicate a title search in a way a typical surface deed chain doesn't.
- The accommodation doctrine, where it applies, is a negotiationbetween the mineral lessee and the surface owner — not something a crew needs to resolve, but worth recognizing when a surface owner raises an objection your paperwork doesn't obviously address.
Quick Reference
- Severed estate — surface and mineral rights owned separately, common in TX and OK
- Dominant estate — the mineral estate legally outranks the surface estate in most producing states
- Mineral deed — permanent conveyance of mineral ownership, described using the same metes-and-bounds or PLSS system as a surface deed
- Lease — a temporary contractual right to develop minerals, not an ownership transfer
- Net mineral acres — a fractional-ownership unit with no surface-deed equivalent
- Pooling/unitization — combining mineral interests from multiple tracts into one production unit, unique to oil and gas