# Depth Severance

**Source:** Buckhead Energy Oil & Gas Encyclopedia (https://www.buckheadenergy.com/learn) — canonical: https://www.buckheadenergy.com/depth-severance

Depth severance is the division of mineral ownership by depth or geologic formation rather than by surface area, so that one party may own the rights above a certain depth (or in a certain formation) while another owns the rights below it — creating separate "shallow" and "deep" mineral estates in the same tract, defined entirely by the depth language in the deed or reservation.

## Splitting the minerals vertically
Mineral ownership is usually pictured as a slice of the surface projected straight down — but it can also be split vertically. A depth severance divides the mineral estate by depth or formation: one owner holds everything above a stated depth or within a named formation, and another holds everything below it. The result is a shallow estate and a deep estate in the very same acreage.
This is done by the words of a deed or reservation — for example, conveying "all minerals below 8,000 feet" or "all rights in the Wolfcamp formation" while reserving the rest. Once severed by depth, the intervals are separate property that can be owned, leased, and sold independently.

## Why depth severances happen
Depth severances have become far more common with stacked plays — areas where several productive formations sit on top of one another. An owner might sell the deep shale rights (where the value is today) while keeping the shallow conventional rights, or a lease might cover only certain depths, releasing the rest. A horizontal Pugh clause (a depth clause) does exactly this: it releases the formations or depths the lessee has not developed, so a lease held by a shallow well does not tie up the deep rights.
The effect is that a single tract can have different owners and different operators at different depths, each developing their own interval.

## Reading the depth language
Because the split is entirely a creature of the deed, the exact depth or formation language controls, and it is a frequent source of title questions. Is the boundary a measured depth, the top or base of a named formation, or the deepest depth drilled? Formation tops can be ambiguous and can even shift with new geologic understanding, so a depth call that seemed clear can be disputed.
A depth severance also means your ownership question is not just "what fraction do I own?" but "at what depths?" — both have to be answered to know what you hold.

## What it means for owners and buyers
If your minerals are subject to a depth severance, you may own only part of the column — and the value depends heavily on which part, because the productive formation may be in the interval you own or the one you do not. Knowing your depths is essential before leasing or selling.
A careful buyer reads the depth language and confirms which formations an interest actually covers, since owning the deep rights in a deep play is very different from owning the shallow rights. Buckhead Energy verifies the depth and formation scope of an interest when valuing it. This page is educational information, not legal advice.

## Frequently asked questions

**What is depth severance?**
The division of mineral ownership by depth or geologic formation rather than by surface area, so one party may own the rights above a certain depth or in a certain formation while another owns those below it. It creates separate shallow and deep mineral estates in the same tract.

**Can mineral rights be owned by formation or depth?**
Yes. A deed or reservation can convey or reserve minerals by depth ("below 8,000 feet") or by formation ("the Wolfcamp"), severing the estate vertically. Once severed, each interval is separate property that can be owned, leased, and sold independently.

**What is a horizontal Pugh clause?**
A depth clause in a lease that releases the formations or depths the lessee has not developed, so a lease held by production in one interval does not tie up the other depths. It is how depth severances often arise out of leasing.

**Why do depth severances matter?**
Because you may own only part of the vertical column, and the value depends on which part — the productive formation may be in the interval you own or the one you do not. Knowing your depths, not just your fraction, is essential before leasing or selling.

**How do I know what depths I own?**
By reading the depth or formation language in the deeds in your chain, which controls the split. The boundary may be a measured depth, a formation top, or the deepest depth drilled, and formation tops can be ambiguous — so a depth severance is a common title question worth an attorney's review.

## Related terms
- [Pugh Clause](https://www.buckheadenergy.com/pugh-clause)
- [Split Estates](https://www.buckheadenergy.com/split-estates)
- [Types of Mineral Interests](https://www.buckheadenergy.com/mineral-interests-types)
- [Subsurface Rights](https://www.buckheadenergy.com/subsurface-rights)
- [Oil & Gas Encyclopedia — all terms](https://www.buckheadenergy.com/learn)

_Educational information only, not legal or tax advice. Buckhead Energy is a direct buyer of oil & gas mineral and royalty interests._