Mineral Rights Glossary

What Are Mineral Rights?

Mineral rights are the legal ownership of subsurface minerals—oil, natural gas, coal, and other resources—beneath a property, separate from surface land ownership. When you own mineral rights, you can generate ongoing income by leasing them to oil and gas operators who pay you royalties for the right to extract and produce minerals. These rights can be inherited, purchased, or held as part of a property deed, and they're valuable assets that can be sold fully or in part to raise capital.

What Is a Mineral Royalty?

A mineral royalty is your percentage share of revenue generated from oil and gas production on your property, typically ranging from 12.5% to 20% of gross income. Unlike operating costs for drilling, development, and production, royalty owners don't pay these expenses. The oil and gas operator (lessee) sends you royalty payments directly, usually monthly or quarterly, based on the volume of minerals produced and current commodity prices.

What Is a Division Order?

A division order is a legal document that specifies each mineral owner's decimal share (ownership percentage) of production from a specific oil or gas well. The operator prepares the division order, and you must sign it to authorize royalty payments to you from that well's production. The document establishes your decimal interest percentage and ensures the operator distributes production revenue correctly to all legitimate owners.

What Is an NPRI?

NPRI (Non-Participating Royalty Interest) is a type of mineral interest that receives royalty payments but has no lease-signing rights or bonus payments. NPRI holders cannot participate in lease negotiations, bonus decisions, or drilling approvals. NPRIs typically receive 12.5% to 18.75% of production revenue without making capital contributions or decisions, making them more passive investments than full mineral rights.

What Is Force Pooling?

Force pooling is a legal process that allows oil and gas operators to drill on mineral properties without obtaining consent from all owners, when certain percentage thresholds are met (typically 80-90% depending on state law). When forced pooled, non-consenting owners become unleased royalty interest holders receiving production royalties. State regulations govern force pooling rules, timing, and owner protections, varying significantly by jurisdiction.

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Complete glossary terms below →

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1031 Exchange

A tax-deferral strategy that lets mineral owners defer capital gains taxes when selling mineral rights by reinvesting the proceeds into similar "like-kind" property within set timeframes. Learn more about 1031 exchanges →

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Abandoned Well

A well no longer in use or maintained by the operator. State rules require abandoned wells to be properly plugged to protect groundwater and the environment.

Accommodation Doctrine

The legal rule balancing the mineral owner's right to use the surface to develop minerals against the surface owner's existing uses, requiring reasonable accommodation where practical alternatives exist. Central to split-estate disputes.

Acreage

The total land area, in acres, subject to a mineral lease or ownership interest.

Ad Valorem Tax

A county property tax based on the assessed value of mineral interests — typically a percentage of the estimated market value of annual production.

AFE (Authorization for Expenditure)

An operator's itemized cost estimate for drilling or completing a well, sent to working-interest owners to approve their share of the spend. Royalty owners are not billed AFEs.

Affidavit of Heirship

A sworn statement identifying a deceased mineral owner's heirs, recorded in the county records. A common curative document for establishing ownership of inherited minerals when no probate was opened. Inherited mineral rights guide →

Allocation Well

A horizontal well whose lateral crosses two or more separate leases or units, with production allocated among them by a stated formula rather than a formal pooling order.

API Number

The unique identifier assigned to every oil and gas well in the United States (American Petroleum Institute numbering). The first digits encode the state and county. Use it to look up any well in state records and production databases.

Assignment

The legal transfer of rights, title, or interest in a mineral lease or mineral ownership from one party to another. Selling mineral rights is executed through an assignment or mineral deed.

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Barrel (BBL)

The standard unit for crude oil, equal to 42 U.S. gallons. Production and royalty statements report oil volumes in barrels.

Basin

A large geological depression holding thick sedimentary rock that may contain oil and gas — e.g., the Permian, Williston, and Anadarko Basins. Basin location strongly affects mineral value.

BOE (Barrel of Oil Equivalent)

A unit that converts natural gas volumes to their energy equivalent in barrels of oil, typically BOE = barrels of oil + (Mcf of gas / 6). Useful for comparing oil-and-gas properties.

Bonus Payment

An upfront, one-time payment from an operator to a mineral owner for signing a lease, separate from royalties and usually paid per net mineral acre.

BTU (British Thermal Unit)

A measure of the heat (energy) content of natural gas. Gas is often priced and measured by its BTU/MMBtu content, not just volume.

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Capital Gains Tax

The tax on the profit from selling a capital asset such as mineral rights, generally at long-term rates if held over a year. Inherited minerals usually receive a stepped-up basis to date-of-death value, reducing the taxable gain. Consult a CPA. Tax implications of selling →

Carried Interest

An arrangement where one party has its share of costs paid by another up to a defined point — often until "payout" — after which it begins bearing costs or its interest reverts. Common in farmouts and promoted deals.

Casing

Steel pipe cemented into a drilled wellbore to stabilize it and isolate underground formations and groundwater from the produced fluids.

Casing Point Election

Under a JOA, the decision point after a well is drilled to total depth where each working-interest owner elects whether to fund the completion (running casing and completing) or go non-consent.

Casinghead Gas

Natural gas produced along with crude oil from an oil well, as opposed to gas from a dedicated gas well.

Chain of Title

The unbroken sequence of recorded conveyances showing how mineral ownership passed from one party to the next over time. A clean chain of title is what a buyer, operator, or title attorney verifies before paying or closing.

Check Stub (Revenue Statement)

The statement accompanying royalty payments, detailing production volumes, prices, deductions, taxes, and net payment for each well — key to understanding income and evaluating offers. How to read your royalty statement →

Clear Title

Mineral ownership free of defects, liens, or questions about legitimacy. Clear title is essential to sell and affects how quickly a sale can close.

Completion

The work that turns a drilled wellbore into a producing well — running casing, perforating, and (in shale plays) hydraulic fracturing. A well that is drilled but awaiting this step is a DUC.

Condensate

A light, liquid hydrocarbon that drops out of natural gas as it is produced and cooled; often priced near crude oil.

Conveyance

A legal document that transfers ownership of mineral rights, such as a mineral deed. Selling minerals is completed by signing a conveyance.

Correlative Rights

The principle that each owner over a common reservoir gets a fair opportunity to produce their share. Spacing, pooling, and allocation rules all exist to protect correlative rights.

Cost Basis

What you paid for minerals plus certain acquisition costs, used to compute taxable gain on a sale. Inherited minerals usually receive a stepped-up basis. Tax implications of selling →

Cost Depletion

A tax deduction that recovers the cost of an investment in mineral property as the minerals are produced. Consult a tax professional for your situation.

Curative

The process of correcting title defects or chain-of-ownership errors via affidavits, ratifications, or corrective deeds. Often resolved before a sale can close.

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Decimal Interest

A mineral owner's share of production expressed as a decimal — generally (net mineral acres ÷ unit size) × royalty rate. For example, a 1/8 royalty equals 0.125. Division orders explained →

Decline Curve

A graph of how a well's production falls over time — steep early, then a long flattening tail. Used to forecast future production and value remaining mineral interests. Why wells decline →

Defects in Title

Errors in the chain of ownership that create uncertainty about who legally owns the minerals — e.g., missing signatures, bad legal descriptions, or gaps in the chain.

Delay Rental

Periodic payments from a lessee to keep a lease in force during the primary term when no drilling has begun. Less common today, as most leases are now "paid-up."

Depletion Allowance

A tax deduction recognizing that minerals are a finite resource being used up. Percentage and cost depletion are the two common methods; consult a CPA.

Direct Buyer

A purchaser that buys mineral and royalty interests with its own capital to hold, rather than brokering or reselling them. The key diligence question for any offer: is closing contingent on the buyer finding someone else's money? Who buys mineral rights — the buyer landscape →

Division Order

A document specifying each owner's decimal share of production from a well, used by the operator to distribute royalty payments correctly. Division orders explained →

Drilling Permit

State authorization (TX RRC, OK OCC, etc.) an operator must obtain before drilling a well. New permits near your acreage are one of the strongest forward-looking signals of mineral value. Texas drilling activity report →

Dry Hole

A well drilled without finding commercially producible oil or gas. The drilling risk dry holes represent is a core reason undeveloped minerals are valued at a discount to producing ones.

DUC (Drilled but Uncompleted)

A well that has been drilled but not yet hydraulically fractured or put on production. DUC inventory is a leading indicator of near-term completion activity.

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Effective Date

In a purchase and sale agreement, the date from which the buyer is entitled to production revenue. Revenue before it generally belongs to the seller. Purchase & sale agreements explained →

Enhanced Oil Recovery (EOR)

Techniques that extend field life beyond primary production — waterflooding, CO2 injection, and similar methods. EOR units (like the legendary West Texas CO2 floods) can pay royalties for many decades.

Escheatment

The transfer of unclaimed property — including uncashed royalty checks and long-suspended funds — to the state after a dormancy period. Escheated mineral royalties are recoverable by the rightful owner or heirs. Unclaimed mineral royalties →

Escrow

A neutral third party that holds funds and documents until closing conditions are met. In a mineral sale, purchase funds and the signed deed can be held in escrow and released simultaneously at closing.

Executive Rights

The right to negotiate and sign oil and gas leases on behalf of a mineral interest, including setting bonus and royalty terms. A non-executive interest lacks this right.

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Fair Market Value

The price a willing buyer and willing seller would agree on for a mineral or royalty interest, neither under pressure and both informed. It reflects production, decline, remaining locations, your interest, and prices — not a flat per-acre figure.

Farmout Agreement

A deal in which a leaseholder assigns drilling rights to another company that commits to drill, usually keeping an overriding royalty. A common way ORRIs are created.

Fee Simple Mineral Rights

The most complete form of mineral ownership — outright, permanent, and inheritable, including executive rights and royalty income.

Force Majeure

A lease clause that suspends an operator's obligations (and can extend the lease) when events beyond its control — natural disasters, war, certain regulatory actions — prevent operations. Owners should note how broadly their lease defines it.

Force Pooling

A legal process by which a state agency combines mineral interests into a drilling unit when voluntary pooling cannot be reached, so a well can proceed. Force pooling explained →

Formation

A distinct layer of rock with consistent characteristics that may hold oil and gas — e.g., the Wolfcamp, Spraberry, or Bakken. Drilling targets specific formations.

Fractional Interest

Ownership of a portion (a fraction) of the total mineral estate in a tract, common after generations of inheritance and conveyances divide the original interest.

Freehold Mineral Rights

Indefinite, inheritable ownership of the minerals beneath a tract — the Canadian equivalent of U.S. fee simple mineral ownership.

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Gas Balancing

The accounting process that reconciles differences when co-owners in a well take unequal shares of gas over time. An "overproduced" party owes a "make-up" to the "underproduced" party, in volume or cash.

Gathering System

The pipelines and equipment that move oil or gas from the wellhead to a central point or larger pipeline. Gathering fees are a common post-production cost.

Gross Acres

The total surface size of a tract or unit, as distinct from net mineral acres, which reflect your fractional ownership of the minerals beneath it. Net mineral acre explained →

Gross Overriding Royalty (GORR)

A share of gross production revenue, before most post-production deductions, carved out of the working interest under a lease.

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Habendum Clause

The lease clause defining how long the lease lasts: a fixed primary term plus a secondary term that continues as long as the lease produces. The source of the phrase "held by production."

Held by Production (HBP)

A lease status meaning the lease has extended past its primary term and stays in force because of ongoing production. Held-by-production explained →

Henry Hub

The Louisiana pipeline hub that serves as the delivery point for U.S. natural gas futures — the benchmark price quoted for American gas, against which your realized gas price can be compared. Live WTI & Henry Hub prices →

Horizontal Drilling

Drilling that turns from vertical to run laterally through a target formation, exposing far more reservoir rock — the backbone of modern shale development.

Hydraulic Fracturing

Pumping fluid and proppant at high pressure to create fractures in tight rock so oil and gas can flow to the wellbore; the "completion" step after drilling.

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Inherited Mineral Rights

Mineral interests received through a will, trust, or intestate succession. Title is established via probate or affidavit of heirship before royalties pay to the heir. Inherited mineral rights guide →

Initial Production (IP) Rate

A new well's early production rate (often quoted as IP30 or IP90, the first 30/90-day average). Impressive IPs fade fast: modern shale wells decline steeply from their initial rates. Why oil & gas wells decline →

Intangible Drilling Costs (IDC)

Non-salvageable drilling expenses (labor, fuel, site prep) that working-interest owners may deduct for tax purposes. Generally relevant to operators, not royalty owners.

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Joint Interest Billing (JIB)

The monthly invoice an operator sends non-operating working-interest owners for their share of a well's drilling and operating costs. Royalty owners do not receive JIBs; working-interest owners do.

Joint Operating Agreement (JOA)

The contract among working-interest owners in a unit that names the operator and governs how costs, revenue, voting, and non-consent elections are handled. It does not bind royalty owners but shapes how a well is developed.

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Landman

A professional who researches mineral title, negotiates leases, and manages land and mineral records for operators or owners.

Landowner Royalty

The royalty reserved to the mineral owner in an oil & gas lease — the classic 1/8-to-1/4 share of production, free of drilling and completion costs. Distinguished from an overriding royalty, which is carved out of the working interest.

Lateral

The horizontal section of a modern well, drilled along the target formation — commonly one to three miles long. Longer laterals contact more rock, which is why lateral length appears in permit data and valuations.

Lease Bonus

See Bonus Payment — the upfront, per-net-mineral-acre payment for signing an oil and gas lease.

Lease Operating Expense (LOE)

The recurring cost of running a producing well (labor, power, chemicals, maintenance). Borne by the working interest, not the royalty owner.

Legal Description

The precise survey description of a tract (e.g., section-township-range or metes-and-bounds) used in deeds, leases, and division orders to identify the property.

Lessee

The party that leases mineral rights from the owner (the operator), gaining the right to explore and produce in exchange for bonus and royalty.

Lessor

The mineral owner who grants an oil and gas lease to a lessee in exchange for bonus and royalty payments.

Life Estate

An ownership interest that lasts only for the lifetime of a named person (the life tenant); at their death it passes to the remaindermen. Common in inherited minerals — the life tenant typically receives income while the remaindermen own the future interest. Inherited mineral rights guide →

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MCF / MMBtu

MCF is one thousand cubic feet of natural gas (a volume); MMBtu is one million British thermal units (an energy measure). Gas is reported and priced in both.

Mineral Deed

The instrument that actually transfers ownership of mineral rights from seller to buyer and is recorded in the county records at closing.

Mineral Estate

The bundle of rights to the minerals beneath a tract — including the right to develop, lease, and receive royalties — which can be owned separately from the surface.

Mineral Rights

The legal ownership of subsurface minerals (oil, gas, and others) beneath a property, separate from surface ownership, including the right to lease and earn royalties. Mineral rights vs. royalties →

Muniment of Title

A streamlined Texas probate proceeding that admits a will to record solely to establish ownership — no executor, no administration — available when the estate has no unpaid debts. Widely used to move inherited mineral title quickly, but Texas generally requires the will to be probated within four years of death. If you inherited minerals under an unprobated will, this is the tool to ask an attorney about first. The inherited-minerals paperwork checklist →

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Net Mineral Acres (NMA)

Your actual mineral acreage — gross acres × your fractional mineral interest. A 1/4 interest in a 320-acre tract is 80 net mineral acres. Net mineral acre explained →

Net Profits Interest (NPI)

A non-operating interest paid from a share of a well's net profits (revenue minus defined costs) rather than gross revenue like a royalty. NPI payments can fall to zero in low-price or high-cost periods.

Net Revenue Interest (NRI)

An owner's share of production revenue after the royalty burden — the decimal actually used to pay each interest from a well's revenue.

Net Royalty Acre (NRA)

A standardized measure of royalty ownership, usually normalized to a 1/8 royalty basis, used to compare royalty interests on common terms.

Non-Consent Penalty

The penalty a working-interest owner pays for electing not to fund its share of a well under a JOA — the consenting owners recover a multiple of their advanced costs from the non-consenting party's revenue before it participates.

Non-Executive Mineral Interest

A mineral interest that shares in bonus and royalty but lacks the executive right to negotiate or sign leases; someone else leases on the group's behalf. NPRI & executive rights →

Non-Operated Working Interest

A working interest whose owner shares in a well's costs and revenue but does not run day-to-day operations — the operator does. Non-operators pay their share via joint interest billings and vote on operations under the joint operating agreement.

Non-Participating Royalty Interest (NPRI)

A royalty interest entitled to a share of production but with no right to lease, no bonus, and no delay rentals — royalties only. NPRI explained →

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Operator

The company responsible for drilling and running a well on behalf of the working-interest owners; the entity that issues division orders and pays royalties.

Orphan Well

A well whose operator no longer exists or cannot be located, leaving plugging obligations to state orphan-well funds. Distinct from an abandoned well, which still has a responsible operator.

Overriding Royalty Interest (ORRI)

A royalty carved out of the working interest, free of operating costs, that expires when the underlying lease terminates. ORRI guide →

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Paid-Up Lease

A lease whose entire primary-term rental is paid at signing, so no delay rentals are owed to keep it alive during the primary term.

Paying Quantities

The legal standard that a well must produce enough to yield a profit over operating costs to hold a lease past its primary term. A well producing "in paying quantities" keeps the lease alive; one that stops may cause the lease to terminate.

Payor

The company that issues royalty and revenue checks for a well — usually the operator or a first purchaser. The payor is who you contact about a missing check, a suspended account, or a division-order question.

Payout

The point at which a well's cumulative revenue has repaid its drilling and completion costs. Many working-interest and some royalty arrangements change terms before versus after payout.

Plat

A drawn map of a survey, unit, or well location filed with state regulators — showing boundaries, acreage, and the wellbore path. Reading the plat tells you whether your tract is inside a producing unit.

Plugging and Abandonment (P&A)

Permanently sealing a depleted or non-viable well with cement and removing surface equipment, as required by state regulators. A working-interest obligation.

Pooling

Combining small mineral tracts into a single drilling unit so a well can be drilled and production shared proportionally among the owners. Pooling vs. unitization →

Post-Production Costs

Costs to gather, process, compress, and transport oil and gas to market that may be deducted from royalties depending on lease language. "Cost-free" clauses limit them.

Post-Production Costs

Expenses incurred between the wellhead and the point of sale — gathering, compression, dehydration, processing, and transportation. Whether they can be deducted from your royalty depends entirely on your lease language, and on gas they can take a startling share of the headline price. A cost-free royalty clause is the protection; your check stubs show what is actually being taken. See how deductions change your check math →

Preferential Right to Purchase

A contractual right (a "pref right" or ROFR) letting a co-owner or partner match a third-party offer before an interest can be sold to that outsider. It can affect the timing and mechanics of a mineral sale.

Primary Term

The initial fixed period of a lease (often 3-5 years) during which the operator must drill or otherwise maintain the lease, or it expires.

Prior Period Adjustment

A correction on a royalty statement restating volumes or prices from earlier months — metering fixes, price restatements, or ownership corrections. It appears as positive or negative line items dated months in the past, and a large negative one can shrink a current check unexpectedly. You are entitled to the supporting detail; ask the operator when an adjustment is material or unexplained. Why checks stop or shrink — and how to fix it →

Probate

The court process that validates a will and transfers a decedent's property — including minerals — to heirs, establishing clear title for the new owner.

Proppant

Sand or engineered particles pumped during hydraulic fracturing to hold the created fractures open so oil and gas can keep flowing.

Proved Developed Producing (PDP)

Reserves from existing wells that are already producing — the lowest-risk reserve category. PDP is the backbone of most royalty valuations because the cash flow is already established.

Proved Reserves

Quantities of oil and gas that geologic and engineering data show, with reasonable certainty, to be recoverable under current economic and operating conditions.

PUD (Proved Undeveloped Reserves)

Proved reserves expected from future drilling on undeveloped locations. PUD potential can add value to minerals beyond current production.

Pugh Clause

A lease clause that releases acreage or depths not held by production after the primary term, preventing one well from holding a large lease indefinitely.

Purchase and Sale Agreement (PSA)

The contract governing a mineral sale — price, exactly what is conveyed, effective date, title and closing, and warranties. The mineral deed then transfers title. PSA explained →

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Quiet Title Action

A lawsuit asking a court to settle competing claims and confirm ownership of property, including minerals. The judicial cure for title defects that affidavits and deeds cannot fix.

Quitclaim Deed

A deed that transfers whatever interest the grantor may have — with no warranty that the title is good or even that they own anything. Used to clear clouds on title; a buyer generally prefers a warranty or mineral deed instead.

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Ratification

A document by which a mineral owner adopts and confirms an existing lease or pooling, often used to cure title or bring an interest under a unit.

Realized Price

The actual price per barrel or Mcf an owner receives after location and quality differentials, gathering, and marketing — typically below the WTI or Henry Hub benchmark. Your check stub shows realized price, not the headline benchmark. Live benchmark prices →

Recompletion

Reworking an existing well to produce from a different formation or zone than it originally did. Like a workover, a recompletion can extend a well's life and revive royalty payments. Why wells decline →

Recoupment

An operator's recovery of money it previously overpaid you, deducted from later royalty checks — commonly after a decimal correction, metering fix, or price restatement. Recoupment is legal and routine, but it should always tie to a documented prior-period adjustment. If checks suddenly shrink with negative line items you cannot trace, request the adjustment support before assuming the math is right. Shrinking checks, explained →

Remainderman

The person who takes full ownership of property — including minerals — when a life estate ends. During the life tenant's lifetime, neither party alone can usually convey the whole interest: selling life-estate minerals typically requires the life tenant and remainderman acting together, and royalty and bonus money is divided between them under state rules. Common in family land planning, and a frequent source of stuck title. Co-owned and family minerals, explained →

Reservation

Language in a deed by which a seller keeps (reserves) some or all of the mineral rights when conveying the surface or another interest.

Reversionary Interest (Back-In)

A right to receive an interest in a well after a triggering event — usually once the paying party recovers its costs (payout). A "back-in after payout" converts a carried or overriding position into a working interest at that point.

Rig Count

The number of drilling rigs actively working in an area, published weekly as an industry activity barometer. A rising rig count in your county signals more future permits, wells, and potential royalties.

Royalty

A cost-free share of production revenue paid to the mineral owner, free of drilling and operating expense; the income side of mineral ownership. Mineral rights vs. royalties →

Royalty Deed

A recorded instrument conveying a royalty interest — the income stream — while the grantor keeps the underlying mineral ownership and executive rights. How many NPRIs are created.

Royalty in Kind

A royalty taken as a physical share of the produced oil or gas rather than as cash. Most royalty owners take cash instead.

Royalty Rate

The fraction of production paid to the owner under a lease. 1/8 (12.5%) is historical; modern leases reach 3/16 or 1/4 (25%), with 25% the strongest owner-favorable target. What is a good royalty rate? →

Rule of Capture

The historic doctrine that an owner may produce oil and gas from a well on their land even if it drains from beneath a neighbor. Spacing and pooling rules developed to temper its effects.

Runsheet

A chronological abstract of every recorded instrument affecting a tract's title, prepared by a landman from courthouse records. It is the working document used to build the chain of title and a title opinion.

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Saltwater Disposal (SWD) Well

A well that injects produced water back underground rather than producing hydrocarbons. SWD payments generally belong to the surface estate, not the mineral owner — a frequent surprise. SWD wells and mineral owners →

Section, Township & Range (PLSS)

The Public Land Survey System grid used in most producing states outside Texas: 640-acre sections within 36-section townships, located by township and range lines. The standard legal description for minerals in Oklahoma, Kansas, and the Rockies.

Severance

The legal separation of mineral rights from surface rights, creating two distinct ownership interests in the same property.

Severance Tax

A state tax on the value or volume of oil and gas produced ("severed") from the ground, typically withheld before royalties are paid.

Shut-In

A well capable of producing that is temporarily closed, often for lack of a market or pipeline. Shut-in royalty clauses can keep a lease alive during shut-in.

Sidetrack

A secondary wellbore drilled off an existing one — to bypass an obstruction, reach a better target, or re-enter a formation. A sidetrack can restore or add production from a well you already have an interest in.

Spacing Unit

The acreage a regulator assigns to a well to drain a reservoir efficiently; your decimal interest depends partly on the unit size.

Spud

To begin drilling a new well. The spud date marks the start of drilling and is a common activity indicator.

Stepped-Up Basis

For inherited minerals, a cost basis reset to fair market value at the prior owner's date of death, which can sharply reduce taxable gain on a later sale. Tax implications of selling →

Stripper Well

A marginal well producing under roughly 15 barrels (or 90 Mcf) per day. Individually small but collectively significant, stripper wells often produce for decades with shallow decline — which is why mature "small-check" royalties still carry real value.

Surface Rights

Ownership of the surface of the land, distinct from the mineral estate. Where severed, the mineral owner generally has reasonable use of the surface to develop minerals.

Surface Use Agreement

A contract setting how an operator may use the surface (roads, pads, water) to develop minerals, and any compensation to the surface owner.

Suspense Funds

Royalty money an operator holds without paying out, typically due to a title issue, missing address, or unsigned division order. Unclaimed suspense funds eventually escheat to the state — and they are recoverable. Unclaimed mineral royalties →

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Take-or-Pay

A gas-contract provision requiring a purchaser to pay for a minimum volume whether or not it takes delivery. Historically significant in gas disputes; it can affect how and when production revenue reaches owners.

Term Royalty

A royalty interest that lasts only for a defined term or for as long as there is production, after which it reverts to the grantor.

Title Opinion

An attorney's formal opinion on who owns the minerals and on what terms, based on a review of the title chain; relied on by operators before paying royalties.

Top Lease

A new lease taken on a tract that is already leased, effective only if and when the existing (bottom) lease expires.

Type Curve

A modeled "average well" production profile for a play or operator, used to estimate how a new or future well is likely to produce and decline. Buyers use type curves to value undeveloped drilling locations.

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Undeveloped Acreage

Leased or owned acreage with no producing wells yet — value rests on the potential for future drilling rather than current cash flow. Often the biggest swing factor between two otherwise similar interests.

Undivided Interest

Ownership of a fractional share of an entire tract rather than a specific physical piece of it — each co-owner owns a percentage of the whole. Most mineral and royalty interests are undivided fractional interests.

Unitization

Combining multiple leases or tracts into one unit to develop a reservoir as a whole, with production allocated among owners by a formula. Pooling vs. unitization →

Unleased Mineral Interest

A mineral interest not currently under an oil and gas lease. Unleased owners may be force-pooled or carried into a unit depending on state law.

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Warranty Deed

A deed in which the grantor guarantees clear title and agrees to defend it against claims — the strongest assurance for a buyer. Contrast with a quitclaim deed, which conveys interest with no such guarantee.

Warranty of Title

A seller's guarantee in a deed or PSA that they own what they are selling. A general warranty is broad; a special or "subject to" warranty is narrower. Purchase & sale agreements →

Wellbore Interest

A royalty or interest limited to production from a specific existing wellbore only — not the surrounding acreage or future wells on the tract.

Wildcat Well

An exploratory well drilled in an unproven area away from known production — higher risk, higher potential reward.

Working Interest

The operating ownership share in a lease — the right and obligation to explore, drill, and produce, and responsibility for the operating costs.

Workover

Maintenance or remedial work on an existing well to restore or boost production, such as cleaning out, re-perforating, or re-stimulating.

WTI (West Texas Intermediate)

The light, sweet crude grade priced at Cushing, Oklahoma that serves as the U.S. oil benchmark. Your realized oil price on a check stub typically tracks WTI minus location and quality differentials. Live WTI & Henry Hub prices →

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