Sell Your Mineral Rights in Union County, AR
Union County is the historic heart of Arkansas oil production — El Dorado sits at the center of a basin that's been producing since the 1920s and still has real activity today. Your mineral rights here may be worth more than you think, especially if they're in or near the Smackover trend. Let's give you an honest picture of what you're holding.
Est. per Acre
$500–$3,500
per net royalty acre
Active Wells
180+
Drilling Activity
Core Basin
Smackover / Arkla
Primary Formation
Primary Resource
Oil
Commodity Type
What's Actually Happening With Mineral Rights in Union County Right Now
Union County is one of the oldest oil-producing counties in Arkansas, and that history cuts both ways — there's real production here, but much of the low-hanging fruit has been developed over the past century. The Smackover Limestone, which sits roughly 7,000 to 8,500 feet below the surface in this part of the state, still draws operator interest for both oil and brine-based operations, and Murphy Oil has maintained a presence in the area for decades. If you've recently received an offer on your minerals, it likely means someone believes there's remaining or enhanced recovery potential on your specific acreage — which is worth taking seriously before you sign anything.
Union County Mineral Rights by the Numbers
~180
wells
Estimated Active Wells (state-reported)
$500 – $3,500
per acre (estimate)
Estimated Value Range per Acre
7,000 – 8,500
feet
Primary Target Depth (Smackover)
Oil
Primary Commodity
El Dorado
(Union County Courthouse)
County Seat
Who's Operating in Union County
Murphy Oil Corporation
MURSouthwestern Energy
SWNCallon Petroleum
CPEAethon Energy
PrivateEl Dorado Chemical Company
PrivateWhat's in the Ground
Smackover Limestone
This is the primary target in Union County and the reason oil was first discovered near El Dorado in 1921. The Smackover is a Jurassic-age carbonate formation that produces oil from porous reef and grainstone facies. In Union County, it sits between roughly 7,000 and 8,500 feet deep — deeper than in some neighboring counties to the north, which affects both well cost and recoverable economics. There is also meaningful interest in Smackover brine for bromine extraction, which adds a layer of industrial activity unique to this part of Arkansas.
Haynesville Shale
The Haynesville extends into southern Arkansas from the Louisiana side of the play. In Union County, it's deeper and thinner than in the core Louisiana parishes, which makes it less economical for most operators at current gas prices. It's worth knowing about if you own deep rights, but it's not the primary driver of value here right now.
Cotton Valley
A tight sandstone formation that has produced gas in parts of southern Arkansas. Historically drilled with vertical wells, Cotton Valley sees limited new drilling activity in Union County under current market conditions, though it may still contribute to legacy well production on your acreage.
What to Know About Union County
Deeds and Mineral Records Filed in El Dorado
All mineral conveyances, leases, and assignments in Union County are recorded at the Union County Courthouse in El Dorado. Arkansas uses a race-notice recording system, which means the first party to record a properly executed deed generally prevails in a title dispute. If you've inherited minerals and haven't formally recorded an updated deed or affidavit of heirship, it's worth addressing before any transaction.
Arkansas Forced Pooling and Integration Rules
Arkansas law allows operators to pool or integrate non-consenting mineral owners into a drilling unit. If you've received a pooling notice, you typically have the option to participate in the well, take a royalty only, or receive a risk penalty. Understanding your options before that deadline passes can meaningfully affect your economics.
Smackover Brine Rights — A Unique Local Consideration
Union County is one of very few places in the country where Smackover brine has significant commercial value for bromine extraction. Some leases and conveyances in this county specifically address brine rights separately from oil and gas. If you're reviewing an offer or an existing lease, pay attention to whether brine or saltwater disposal rights are included or carved out.
Murphy Oil's Long History Here
Murphy Oil Corporation, headquartered in El Dorado, has operated in Union County for decades and is one of the most active parties in local mineral transactions. If you've received an offer that traces back to Murphy or one of its affiliates, you're dealing with an operator that knows this acreage extremely well — which is one more reason to make sure you do too before agreeing to terms.
Questions We Hear From Union County Owners
I inherited minerals near El Dorado. Are they producing anything, and how do I find out?
An operator offered me $800 per acre. Is that a fair price for Union County minerals?
What makes Union County different from other Smackover counties in Arkansas?
Find Out What Your Union County Minerals Are Actually Worth
Whether you just got an offer, inherited rights you know nothing about, or have been sitting on these minerals for years, the first step is a free, no-pressure conversation. We'll look at your specific acreage, check what's been leased and produced nearby, and give you a straight answer — not a sales pitch.
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