WELL · 42-255-37678 · DISTRICT 2

Hedtke-Martinez-Henke SA #1H

Karnes County · Eagleville (Eagle Ford-2) field · Producing · Horizontal

Hedtke-Martinez-Henke SA #1H (API 42-255-37678) is a horizontal well in Karnes County operated by Marathon Oil EF LLC, completed September 24, 2023 and listed as producing on the RRC schedule.

The RRC has issued one drilling permit, issued January 20, 2023, permitted to 26,000 ft.

Completion filings report 10 formation tops, including Queen City, Reklaw, Carrizo, Wilcox.

Its lease has reported 226K barrels of oil and 395K mcf of gas since March 2023, last reporting in July 2026.

Operator of record

Marathon Oil EF LLC

Based in: Houston, TX
P-5 status: Active (A)
P-5 last filed: Sep 26, 2025
Permits on file: 3,191
Phone: (832) 486-2737

SOURCE · RRC EWA WELLBORE SCHEDULE

What each RRC source says

Wellbore schedule	Marathon Oil EF LLC
Production reports	Marathon Oil EF LLCthrough Apr 2026
Latest permit	Marathon Oil EF LLCJan 20, 2023

26,000: total depth, ft
1: permits on file
Jan 20, 2023: last permit issued
Sep 24, 2023: completed
226K: cumulative oil, bbl
395K: cumulative gas, mcf

PRODUCTION FROM PDQ LEASE REPORTS · Mar 2023 THROUGH Jul 2026

Regulatory status · RRC wellbore file

Schedule: ON SCHEDULE
Completed: Sep 24, 2023
Shut in: —
Plugged: —

Operator's P-5 on the schedule: Active (A)

Surface location

28.848389, -97.994408

Google Maps ↗

Permit surface location from the RRC GIS record, in Karnes County.

Lease production

PDQ LEASE REPORTS · REPORTED THROUGH APR 2026

Texas reports oil by lease, not by well. These are the lease this well is completed on; this well is the only one on it.Why →

Lease	Field	Reporting operator	Wells	Oil, bbl	Gas, mcf	Reported
Hedtke-Martinez-Henke SA O-2-12598	Eagleville (Eagle Ford-2)	Marathon Oil EF LLC	1	226K	395K	Mar 2023 – Jul 2026

Oil, barrels lease total

Last 12 months 29,291 · prior 12 52,405(-44%)

Gas, mcf lease total

Last 12 months 61,909 · prior 12 108,304(-43%)

Chain of custody

Every operator that reported production on this well's lease, in order.

1Marathon Oil EF LLCJul 2023 → Apr 2026

Permits

Permit	Type	Operator	Received	Issued	Spud	Depth
887318-99	Drill	Marathon Oil EF LLC	Jan 16, 2023	Jan 20, 2023	Feb 19, 2023	26,000

Completions

Completed	Lease	Field	Operator	Status	Depth
—	— O-2-12598	—	—	—	—

Formation tops

As filed on W-2/G-1. Subsea from 454 ft elevation.Download CSV →

Formation	MD ft	Subsea
Queen City	3,620	-3,166
Reklaw	4,213	-3,759
Carrizo	4,716	-4,262
WilcoxWILCOX - DISPOSAL	4,799	-4,345
Austin ChalkAUSTIN CHALK - H2S	11,439	-10,985
Eagle FordEAGLE FORD - H2S	11,634	-11,180
EdwardsEDWARDS - H2S	—	—
FrioFRIO - DISPOSAL	—	—
SligoSLIGO - H2S	—	—
YeguaYEGUA - DISPOSAL	—	—

Perforations

Perforated and open-hole intervals.

From	To	Type
12,044	18,877	Perforated

Casing

Strings as reported, shallowest first.

Casing in	Set at	Hole in	Cement
9.625	5,925	12.25	1,448 S
6	18,877	8.75	2,966 S

Completion filings

W-2 and G-1 reports on record in the RRC wellbore file, newest first. The suffix identifies the wellbore or completion event. About these reports →

Filed	W-2 / G-1 date	Logs referenced
Dec 13, 2023	Nov 28, 2023	Yes
Nov 29, 2023	Oct 19, 2023	—
Jul 13, 2023	Jun 22, 2023	Yes

The source documents

Petrora holds the structured record. The scanned filings live at the RRC; these links open its search already filled in for this API.

Wellbore filings for 42-255-37678 → W-2, G-1, plugging reports, as PDFs
Completion packets for 42-255-37678 → scanned completion filings

Log images are in archives with no per-well link: the RRC's Neubus archive (2004 onward). then paste it into their search.

Nearby wells and their tops

NEAREST 8 LOCATED WELLS WITH TOPS · WITHIN 16 KM

Draw a cross-section

This well's tops beside its 5 nearest neighbors, subsea-aligned so they line up regardless of surface terrain.

Open the cross-section →

Vajdos-Foegelle Unit42-255-37677

0.0 KM · Marathon Oil EF LLC · Section with this well →

Queen City	3,620	-3,166
Reklaw	4,213	-3,759
Carrizo	4,716	-4,262
Wilcox	4,799	-4,345
Austin Chalk	11,449	-10,995
Eagle Ford	11,648	-11,194
Sligo	—
Frio	—

10 TOPS · FIRST 8

Hedtke-Henke Unit42-255-37675

0.0 KM · Marathon Oil EF LLC · Section with this well →

Queen City	3,620	-3,166
Reklaw	4,213	-3,759
Carrizo	4,716	-4,262
Wilcox	4,799	-4,345
Austin Chalk	11,426	-10,972
Eagle Ford	11,623	-11,169
Yegua	—
Edwards	—

10 TOPS · FIRST 8

Vajdos-Foegelle Unit42-255-37676

0.0 KM · Marathon Oil EF LLC · Section with this well →

Queen City	3,620	-3,166
Reklaw	4,213	-3,759
Carrizo	4,716	-4,262
Wilcox	4,799	-4,345
Austin Chalk	11,470	-11,016
Eagle Ford	11,669	-11,215
Sligo	—
Edwards	—

10 TOPS · FIRST 8

Hedtke-Henke Unit42-255-37674

0.0 KM · Marathon Oil EF LLC · Section with this well →

Queen City	3,620	-3,166
Reklaw	4,213	-3,759
Carrizo	4,716	-4,262
Wilcox	4,799	-4,345
Austin Chalk	11,408	-10,954
Eagle Ford	11,603	-11,149
Sligo	—
Yegua	—

10 TOPS · FIRST 8

Davenport-Brown Dupnik B SA42-255-37316

0.3 KM · Marathon Oil EF LLC · Section with this well →

Yegua	1,745	-1,306
Queen City	3,861	-3,422
Reklaw	4,447	-4,008
Carrizo	4,800	-4,361
Wilcox	6,404	-5,965
Austin Chalk	11,422	-10,983
Eagle Ford	11,641	-11,202
Sligo	—

10 TOPS · FIRST 8

Brown-Dupnik B Unit42-255-37318

0.3 KM · Marathon Oil EF LLC · Section with this well →

Yegua	1,758	-1,319
Queen City	3,874	-3,435
Reklaw	4,460	-4,021
Carrizo	4,813	-4,374
Wilcox	6,417	-5,978
Austin Chalk	11,433	-10,994
Eagle Ford	11,644	-11,205
Edwards	—

10 TOPS · FIRST 8

Brown-Dupnik B Unit42-255-37317

0.3 KM · Marathon Oil EF LLC · Section with this well →

Yegua	1,795	-1,356
Queen City	3,896	-3,457
Reklaw	4,480	-4,041
Carrizo	4,833	-4,394
Wilcox	6,436	-5,997
Austin Chalk	11,447	-11,008
Eagle Ford	11,657	-11,218
Sligo	—

10 TOPS · FIRST 8

Scheele-Huth Unit A42-255-37533

0.9 KM · Marathon Oil EF LLC · Section with this well →

Queen City	3,602	-3,153
Reklaw	4,215	-3,766
Carrizo	4,746	-4,297
Wilcox	4,811	-4,362
Austin Chalk	11,428	-10,979
Eagle Ford	11,620	-11,171
Frio	—
Yegua	—

10 TOPS · FIRST 8

About this data

Permits from the RRC OGA049M master and daily daf420 files; wellbore and operator of record from the EWA schedule, weekly; completions, formation tops, casing, and perforations from the dbf900 wellbore file; production from PDQ lease reports, which lag two to three months; injection from UIC permits, H-10 reports, and TexNet daily volumes; earthquakes from the TexNet catalog.

New to these records? How to read a well page · API numbers · completion reports and tops · why production is by lease

Developers: this page as JSON is GET /v1/data/wells/25537678, documented in the API reference.