Subsurface rights are the rights to the substances and the space beneath the surface of a tract of land — a broad category that includes the mineral rights to oil, gas, and other minerals and, increasingly recognized as a distinct interest, the pore space (the void volume within the rock). They are distinguished from surface rights, which concern the ground and its use.
When land is divided into estates, the most familiar split is between the surface and the minerals. But "subsurface" is broader than "minerals." It refers to everything below the surface — most importantly the mineral estate (oil, gas, coal, and other minerals), and increasingly the pore space: the empty volume within the rock that can hold fluids. Depending on the state and context, subsurface interests can also touch geothermal resources and certain groundwater. Subsurface rights, in other words, are the umbrella; mineral rights are the best-known interest under it.
It helps to line the three up. Surface rights are the rights to occupy and use the ground — living, farming, building, access. Mineral rights are the rights to the oil, gas, and minerals beneath it. Subsurface rights encompass the mineral rights and the other below-ground interests such as pore space. In a split estate, surface and minerals are already owned separately; the newer question is who owns the space the minerals leave behind, which is not always the same party that owns the minerals.
The subsurface right drawing the most modern attention is pore space — the void volume in a formation that can store fluids. It matters because deep formations can be used to inject and hold substances underground. The key ownership rule in most U.S. states is that pore space belongs to the surface owner, not the mineral owner, because it is part of the rock itself rather than the minerals within it — though this varies and is still developing by state and by statute. For a fuller treatment see pore space rights vs. mineral rights.
Underground space has become economically valuable in ways that were once academic. Depleted reservoirs and deep saline formations can store natural gas seasonally or hold injected CO2 under EPA Class VI permits; hot rock at depth can supply geothermal energy; and salt caverns store hydrocarbons and other products. Each use raises the same question — who owns the right to use the space: the surface owner (who generally owns the pore space), the mineral owner, or a party who has acquired a specific subsurface right by contract?
As these uses grow, subsurface rights that were never separately valued are becoming the subject of leases, agreements, and in some states new statutes clarifying ownership. For a mineral or surface owner, that means an old deed can now control rights with real modern value — one more reason to know exactly which subsurface interests your chain of title actually conveys.
For a mineral owner, the practical point is that owning the minerals does not necessarily mean owning everything below the surface. Your mineral estate gives you the oil, gas, and minerals; the space they occupy, and rights to it, may belong to the surface owner. Conversely, a surface owner may hold valuable pore-space rights even where the minerals are severed away. As underground space becomes economically useful, confirming exactly which subsurface interests you own — minerals, pore space, or both — is increasingly worth doing. This is educational background, not legal advice; subsurface and pore-space ownership rules vary by state, so consult a qualified oil and gas attorney about your specific interest.
Oil & Gas Encyclopedia — all terms
Educational information only — not legal, tax, or investment advice. Consult a qualified attorney, CPA, or landman about your specific situation.
Subsurface rights are the rights to the substances and space beneath the surface of land — most importantly the mineral estate (oil, gas, and minerals) and, increasingly recognized as distinct, the pore space (the void volume in the rock). They are broader than "mineral rights" and separate from surface rights.
Not exactly. Mineral rights — to the oil, gas, and minerals — are the best-known subsurface interest, but "subsurface" is broader and also covers pore space (the empty space in the rock) and, in some contexts, geothermal or groundwater interests. Mineral rights are one interest under the subsurface umbrella.
In most U.S. states, pore space belongs to the surface owner rather than the mineral owner, because it is part of the rock itself rather than the minerals within it. This varies by state and is still developing through statutes and case law, so confirm your specific situation with a qualified attorney.
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