TURNBULL E-F-KOWALIK SA1

TURNBULL E-F-KOWALIK SA1 is a Texas oil lease in Karnes County, Railroad Commission district 02, operated by Marathon Oil Ef LLC. It has 1 wellbore on file with the Commission. Reported production runs from July 2023 to August 2026, totalling 195,819 barrels. The lease is currently producing. Fitting a decline curve to that history and pricing the remaining production at today's forward curve values the whole lease — a 100% undivided interest — at about $4.7M, with roughly $1.2M expected over the next twelve months. An individual royalty owner receives their own decimal interest times that figure. Over the last twelve months on file it averaged 1,607 barrels a month. Its strongest month on the record we hold was August 2023, at 24,047 barrels. In our own backtest, leases producing at this rate are forecast to within about 17% of what they went on to produce, and that measured error is the range shown on the page rather than a confidence of our own devising.

Key facts about TURNBULL E-F-KOWALIK SA1

Who operates TURNBULL E-F-KOWALIK SA1?: TURNBULL E-F-KOWALIK SA1 is operated by Marathon Oil Ef LLC, Railroad Commission of Texas operator number 525398.
Where is TURNBULL E-F-KOWALIK SA1?: TURNBULL E-F-KOWALIK SA1 is a Texas oil lease in Karnes County, Texas, in Railroad Commission district 02. Its Railroad Commission lease number is 12661.
Is TURNBULL E-F-KOWALIK SA1 still producing?: TURNBULL E-F-KOWALIK SA1 is currently producing. The most recent month of production reported to the Railroad Commission of Texas for TURNBULL E-F-KOWALIK SA1 is August 2026.
How much has TURNBULL E-F-KOWALIK SA1 produced?: TURNBULL E-F-KOWALIK SA1 has reported 195,819 barrels of oil (bbl) to the Railroad Commission of Texas between July 2023 and August 2026, from 1 wellbore.
How much is TURNBULL E-F-KOWALIK SA1 worth?: The remaining production from TURNBULL E-F-KOWALIK SA1 is estimated to be worth about $4.7M in total as of 26 August 2026, within a range of $3.9M to $5.5M. That figure is the whole lease, undivided — not any one owner's share. A royalty interest in TURNBULL E-F-KOWALIK SA1 is a fraction of it. The estimate fits an Arps decline curve to the production TURNBULL E-F-KOWALIK SA1 has already reported, prices the remaining production at the current forward strip, and discounts it at 12% a year. The figure shown for TURNBULL E-F-KOWALIK SA1 is an estimate of value, not an offer and not an appraisal.
How much income does TURNBULL E-F-KOWALIK SA1 generate in a year?: TURNBULL E-F-KOWALIK SA1 is forecast to net about $1.2M across the whole undivided lease over the twelve months following 26 August 2026, before income tax. A royalty owner in TURNBULL E-F-KOWALIK SA1 receives a fraction of that, set by the decimal interest printed on their check stub.

Lease record

TURNBULL E-F-KOWALIK SA1 as filed with the Railroad Commission of Texas
Operator	Marathon Oil Ef LLC
Field	Eagleville (Eagle Ford-2)
County	Karnes County, Texas
RRC district	02
Lease number	12661
Wellbores	1
Reported production	195,819 bbl
First reported	July 2023
Last reported	August 2026
Estimated royalty value	$4.7M

Where TURNBULL E-F-KOWALIK SA1 sits

Source: Railroad Commission of Texas lease production records, complete through August 2026. Figures on this page were computed on 26 August 2026.

Production figures are as reported to the Railroad Commission of Texas. The value shown is an estimate produced by fitting a decline curve to that reported history; it is not an offer or an appraisal. How this estimate is calculated.