Sell Mineral Rights
in Karnes County,
Texas.
Karnes County sits at the heart of the Eagle Ford black oil window, where the play first proved itself at scale in 2010 and 2011. If you own mineral rights here, you own a piece of one of the most productive shale oil counties in the country, with active Eagle Ford development, legacy production still on the books, and a growing pipeline of Austin Chalk redevelopment. We are happy to help you understand what you have.
The heart of the Eagle Ford
black oil window.
Karnes County sits in South Texas, roughly an hour southeast of San Antonio, in the part of the Eagle Ford that produces predominantly black oil. The Eagle Ford itself runs in a long arc across South Texas, transitioning from oil in the north to condensate to dry gas as it deepens to the south. Karnes lies in the sweet spot of that transition where the rock is mature enough to have generated oil, but not so deep that it has been cooked into gas.
The Eagle Ford was the first major US shale oil play to be developed at scale, and Karnes was at the center of it from the beginning. The first horizontal Eagle Ford wells in Karnes were drilled around 2009 and 2010, and the county quickly became one of the most active in Texas. Operators built out gathering pipelines, processing facilities, and trucking infrastructure that still serves the region today. Production peaked in the mid 2010s, declined as drilling slowed during the 2015 to 2016 oil price downturn, and has settled into a steadier rhythm with periodic refracturing and Austin Chalk development layered on top of the original Eagle Ford program.
If you are reading this, you may own a piece of that. Maybe you inherited minerals tracing back to a Spanish or Mexican land grant, an old family ranch, or a homestead patent. Maybe you have been receiving royalty checks since 2011 and are wondering where things go from here. Maybe a landman just sent you a letter about a new Austin Chalk lease. This page walks through the rock, the operators, the geography, valuation, and the regulatory landscape, in plain language.
Have minerals in Karnes County? Send us what you have and we will take a look.
Two productive horizons
stacked together.
Karnes County's productive geology is straightforward by Permian standards but exceptionally consistent. The Eagle Ford shale is the primary target, lying at roughly 9,000 to 11,000 feet across most of the county. The Austin Chalk sits directly above it and has emerged as a meaningful secondary target. Both are typically developed horizontally, with the Eagle Ford program now mature and Austin Chalk activity accelerating.
The Eagle Ford shale is an organic-rich marine mudstone deposited during the Late Cretaceous. Across Karnes County the formation is generally between 200 and 400 feet thick, with operators typically targeting the lower Eagle Ford bench, which has the highest organic content and the best fracability. Karnes sits in the part of the play where the Eagle Ford is mature enough to produce predominantly black oil rather than condensate or gas.
For mineral owners, Eagle Ford development in Karnes typically means one or more long-lateral horizontal wells per spacing unit, with steep initial decline followed by a long, shallow tail. Many original Eagle Ford wells drilled in 2011 and 2012 are still producing, and operators are increasingly returning to refrac existing wells with modern completion techniques.
The Austin Chalk lies directly above the Eagle Ford and is a fractured carbonate rather than a true shale. It has produced oil in Karnes and surrounding counties since long before the Eagle Ford boom, originally through vertical and short horizontal wells. In recent years operators have re-focused on the Austin Chalk as a horizontal target, drilling long laterals using modern completion techniques developed in the Eagle Ford.
For mineral owners, Austin Chalk activity is increasingly meaningful in Karnes. A spacing unit with established Eagle Ford production may now see additional Austin Chalk wells drilled, generating new royalty streams on the same minerals. The Austin Chalk and Eagle Ford are typically considered separate formations for spacing and royalty purposes.
Below the Eagle Ford, the Buda limestone has produced from vertical wells in parts of Karnes County for decades. Other shallower zones, including various Wilcox and Olmos sands, have also produced historically. None of these are major modern horizontal targets, but legacy vertical production from these zones still continues across many parts of the county and contributes to royalty income for some mineral owners.
The practical implication for mineral owners is that even outside of new Eagle Ford and Austin Chalk activity, older vertical wells may still be on production and generating modest royalty checks. These should not be ignored when looking at the full picture of what your minerals produce.
Who is drilling on your
Karnes County minerals.
The Eagle Ford operator landscape has consolidated over the years as the original wave of independents was acquired or merged with larger players. The operators below are leaders in current Karnes County activity, but Karnes has many more meaningful operators than this list captures.
We know how these operators develop in Karnes County. Happy to give you context on yours.
Not all Karnes County
minerals are built the same.
Karnes County covers about 750 square miles across South Texas. The Eagle Ford runs through the county at productive depth and quality, but reservoir character, operator activity, and remaining inventory vary by area. Karnes City is the county seat, and Kenedy is the largest town. Where in the county your minerals sit shapes everything from operator activity to formation depth and well vintage.
What your Karnes County
mineral rights are worth.
Valuation in Karnes County reflects its position as the heart of the Eagle Ford black oil window. Long history of activity, established infrastructure, multiple stacked targets, and continued refrac and Austin Chalk development all support strong mineral valuations. The four scenarios below cover what we see most often.
We would rather look at real facts than speak in generalities. Send us what you have.
Texas rules,
Eagle Ford realities.
Karnes County operates under the Texas oil and gas regime, administered primarily by the Texas Railroad Commission. The on-the-ground realities reflect the long history of Eagle Ford development, established gathering and processing infrastructure, and the layered chain-of-title work that comes with old South Texas land grants and decades of legacy production.
The Texas RRC and how spacing works
The Texas Railroad Commission (RRC) regulates oil and gas activity on private and state minerals in Texas. The RRC permits wells, conducts hearings on spacing and unitization issues, and maintains the public well database. Texas Eagle Ford spacing has evolved over the years as operators moved to longer laterals, and modern Karnes wells are often pooled into larger units that match two-mile or longer laterals across multiple legacy tracts.
Texas pooling and lease language
Texas relies primarily on lease pooling clauses rather than mandatory pooling. Whether and how your minerals can be pooled into a horizontal unit depends substantially on the language of your specific lease. Older leases sometimes have restrictive pooling language that can complicate modern unit formation. Newer leases generally have broader pooling clauses written with horizontal development in mind. This is one of the most important pieces of lease language to review when looking at value.
Post-production costs and royalty deductions
Texas generally allows operators to deduct certain post-production costs from royalty calculations unless the lease specifies otherwise. Whether your specific lease permits which deductions, and how the operator calculates them, depends entirely on the lease language. The Texas Supreme Court has issued several major decisions over the years interpreting royalty clauses, and the practical effect on a given owner can be material. Reading your lease carefully and checking how the operator is calculating deductions is worth doing.
Surface use and South Texas land grants
Many Karnes County tracts trace back to original Spanish and Mexican land grants, with chains of title that can span many generations of heirs spread across multiple states and sometimes multiple countries. This is normal in South Texas and is not in itself an obstacle to a clean transaction, but it does mean title work in Karnes is sometimes more involved than in counties with newer settlement histories. We are comfortable working through these chains.
The real questions
mineral owners ask.
We have been through these conversations hundreds of times. Below are honest answers to the things people actually want to know.
Find out what your
Karnes County minerals
are actually worth.
Send us what you have, or what you think you have. We will pull Texas Railroad Commission records, check operator activity in your section, and put together a plain-English summary with our reasoning laid out. If it makes sense to go further, we move on your timeline. If not, you have a free breakdown you can take anywhere.