WELL · 42-255-37681 · DISTRICT 2

Vajdos F-Forister 541 a SA #1H

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

Vajdos F-Forister 541 A SA #1H (API 42-255-37681) is a horizontal well in Karnes County operated by Marathon Oil EF LLC, completed September 13, 2023 and listed as producing on the RRC schedule.

The RRC has issued one drilling permit, issued January 23, 2023, permitted to 26,000 ft.

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

Its lease has reported 225K barrels of oil and 366K 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 23, 2023

26,000: total depth, ft
1: permits on file
Jan 23, 2023: last permit issued
Sep 13, 2023: completed
225K: cumulative oil, bbl
366K: cumulative gas, mcf

PRODUCTION FROM PDQ LEASE REPORTS · Mar 2023 THROUGH Jul 2026

Regulatory status · RRC wellbore file

Schedule: ON SCHEDULE
Completed: Sep 13, 2023
Shut in: —
Plugged: —

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

Surface location

28.853162, -97.982453

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
Vajdos F-Forister 541 a SA O-2-12564	Eagleville (Eagle Ford-2)	Marathon Oil EF LLC	1	225K	366K	Mar 2023 – Jul 2026

Oil, barrels lease total

Last 12 months 31,668 · prior 12 52,948(-40%)

Gas, mcf lease total

Last 12 months 65,456 · prior 12 108,663(-40%)

Chain of custody

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

1Marathon Oil EF LLCSep 2023 → Apr 2026

Permits

Permit	Type	Operator	Received	Issued	Spud	Depth
887436-99	Drill	Marathon Oil EF LLC	Jan 18, 2023	Jan 23, 2023	Feb 21, 2023	26,000

Completions

Completed	Lease	Field	Operator	Status	Depth
—	— O-2-12564	—	—	—	—

Formation tops

As filed on W-2/G-1. Subsea from 406 ft elevation.Download CSV →

Formation	MD ft	Subsea
Queen City	3,613	-3,207
Reklaw	4,189	-3,783
Carrizo	4,680	-4,274
WilcoxWILCOX - DISPOSAL	4,783	-4,377
Austin ChalkAUSTIN CHALK - H2S	11,455	-11,049
Eagle FordEAGLE FORD - H2S	11,646	-11,240
EdwardsEDWARDS - H2S	—	—
FrioFRIO - DISPOSAL	—	—
SligoSLIGO - H2S	—	—
YeguaYEGUA - DISPOSAL	—	—

Perforations

Perforated and open-hole intervals.

From	To	Type
12,032	18,863	Perforated

Casing

Strings as reported, shallowest first.

Casing in	Set at	Hole in	Cement
9.625	5,928	12.25	1,432 S
6	18,863	8.75	3,059 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 →

Suffix	Filed	W-2 / G-1 date	Logs referenced
00	Dec 4, 2023	Nov 21, 2023	Yes
00	May 30, 2023	May 17, 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 42-255-37681 → W-2, G-1, plugging reports, as PDFs
Completion packets for 42-255-37681 → 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 →

B.dupnik-V.foegelle-F.541 B SA42-255-37682

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

Queen City	3,613	-3,207
Reklaw	4,189	-3,783
Carrizo	4,680	-4,274
Wilcox	4,783	-4,377
Austin Chalk	11,487	-11,081
Eagle Ford	11,680	-11,274
Edwards	—
Frio	—

10 TOPS · FIRST 8

Holland-O.forister 541 B SA42-255-37680

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

Queen City	3,613	-3,207
Reklaw	4,189	-3,783
Carrizo	4,680	-4,274
Wilcox	4,783	-4,377
Austin Chalk	11,474	-11,068
Eagle Ford	11,669	-11,263
Edwards	—
Frio	—

10 TOPS · FIRST 8

Holland-Opiela Unit42-255-37679

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

Queen City	3,613	-3,207
Reklaw	4,189	-3,783
Carrizo	4,680	-4,274
Wilcox	4,783	-4,377
Austin Chalk	11,457	-11,051
Eagle Ford	11,677	-11,271
Edwards	—
Sligo	—

10 TOPS · FIRST 8

Holland-Opiela Unit42-255-37688

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

Queen City	3,613	-3,207
Reklaw	4,189	-3,783
Carrizo	4,680	-4,274
Wilcox	4,783	-4,377
Austin Chalk	11,490	-11,084
Eagle Ford	11,686	-11,280
Frio	—
Yegua	—

10 TOPS · FIRST 8

Holland-Opiela Unit42-255-36758

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

Yegua	1,596	-1,208
Queen City	3,719	-3,331
Reklaw	4,216	-3,828
Carrizo	4,855	-4,467
Wilcox	6,169	-5,781
Austin Chalk	11,495	-11,107
Eagle Ford	11,691	-11,303
Edwards	—

10 TOPS · FIRST 8

Holland-Opiela Unit42-255-36759

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

Yegua	1,596	-1,208
Queen City	3,719	-3,331
Reklaw	4,216	-3,828
Carrizo	4,855	-4,467
Wilcox	6,169	-5,781
Austin Chalk	11,513	-11,125
Eagle Ford	11,704	-11,316
Frio	—

10 TOPS · FIRST 8

Holland-Opiela Unit42-255-36760

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

Yegua	1,596	-1,208
Queen City	3,719	-3,331
Reklaw	4,216	-3,828
Carrizo	4,855	-4,467
Wilcox	6,169	-5,781
Austin Chalk	11,524	-11,136
Eagle Ford	11,718	-11,330
Sligo	—

10 TOPS · FIRST 8

Holland Opiela-Tipton Jonas SA42-255-36761

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

Yegua	1,596	-1,208
Queen City	3,719	-3,331
Reklaw	4,216	-3,828
Carrizo	4,855	-4,467
Wilcox	6,169	-5,781
Austin Chalk	11,534	-11,146
Eagle Ford	11,730	-11,342
Edwards	—

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/25537681, documented in the API reference.