WELL · 42-013-35768 · DISTRICT 2
Guajillo Unit 15 South #1H
Atascosa County · Horizontal
Guajillo Unit 15 South #1H (API 42-013-35768) is a permitted horizontal well in Atascosa County filed by Marathon Oil EF LLC; no completion report is on file yet.
The RRC has issued 2 drilling permits (amended once) between 2019 and 2021, permitted to 22,000 ft.
Completion filings report 10 formation tops, including Queen City, Reklaw, Carrizo, Wilcox.
Its lease has reported 1.03M barrels of oil and 1.02M mcf of gas since January 2022, last reporting in July 2026. The lease carries 5 wells, so these are lease totals, not this well alone.
Operator of record
- 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 | none |
| Production reports | Marathon Oil EF LLCthrough Apr 2026 |
| Latest permit | Marathon Oil EF LLCNov 23, 2021 |
- 22,000
- total depth, ft
- 3
- permits on file
- Nov 23, 2021
- last permit issued
- —
- completed
- 1.03M
- cumulative oil, bbl
- 1.02M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 2022 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- —
- Shut in
- —
- Plugged
- —
Surface location
28.671858, -98.310497
Permit surface location from the RRC GIS record, in Atascosa 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; they carry 5 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Guajillo Unit 15 South O-2-12265 | Eagleville (Eagle Ford-2) | Marathon Oil EF LLC | 5 | 1.03M | 1.02M | Jan 2022 – Jul 2026 |
Oil, barrels lease total
Last 12 months 73,789 · prior 12 106,766(-31%)
Gas, mcf lease total
Last 12 months 63,157 · prior 12 175,773(-64%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Marathon Oil EF LLCJul 2022 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 874639-98 | Drill | Marathon Oil EF LLC | Aug 22, 2022 | Nov 23, 2021 | Jan 16, 2022 | 22,000 |
| 874639-99 | Drill | Marathon Oil EF LLC | Nov 18, 2021 | Nov 23, 2021 | Jan 16, 2022 | 22,000 |
| 858280-99 | Drill | Marathon Oil EF LLC | Oct 22, 2019 | Oct 28, 2019 | — | 22,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-2-12265 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 231 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Queen City | 2,741 | -2,510 |
| Reklaw | 3,094 | -2,863 |
| Carrizo | 3,728 | -3,497 |
| WilcoxWILCOX - DISPOSAL | 5,155 | -4,924 |
| AnacachoANACACHO - H2S | 10,371 | -10,140 |
| Austin ChalkAUSTIN CHALK - H2S, DISPOSAL | 10,616 | -10,385 |
| Bartosh | — | — |
| EscondidoESCONDIDO - H2S, DISPOSAL | — | — |
| NavarroNAVARRO - H2S | — | — |
| OlmosOLMOS - DISPOSAL | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 11,126 | 17,599 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 5,205 | 12.25 | 1,578 S |
| 5.5 | 17,599 | 8.75 | 2,717 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 | Nov 21, 2022 | Oct 20, 2022 | Yes |
| 00 | Aug 31, 2022 | Jul 29, 2022 | — |
| 00 | Feb 10, 2022 | Jan 25, 2022 | 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 42-013-35768 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-013-35768 → 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.
Guajillo Unit 15 South42-013-35769
0.0 KM · Marathon Oil EF LLC · Section with this well →
| Queen City | 2,741 | -2,511 |
| Reklaw | 3,094 | -2,864 |
| Carrizo | 3,728 | -3,498 |
| Wilcox | 5,155 | -4,925 |
| Anacacho | 10,372 | -10,142 |
| Austin Chalk | 10,608 | -10,378 |
| Eagle Ford | 10,730 | -10,500 |
| Escondido | — |
11 TOPS · FIRST 8
Guajillo Unit 15 South42-013-35770
0.0 KM · Marathon Oil EF LLC · Section with this well →
| Queen City | 2,741 | -2,511 |
| Reklaw | 3,094 | -2,864 |
| Carrizo | 3,728 | -3,498 |
| Wilcox | 5,155 | -4,925 |
| Anacacho | 10,337 | -10,107 |
| Austin Chalk | 10,586 | -10,356 |
| Olmos | — | |
| Bartosh | — |
10 TOPS · FIRST 8
Guajillo Unit 15 South42-013-35771
0.0 KM · Marathon Oil EF LLC · Section with this well →
| Queen City | 2,741 | -2,511 |
| Reklaw | 3,094 | -2,864 |
| Carrizo | 3,728 | -3,498 |
| Wilcox | 5,155 | -4,925 |
| Wilcox | 5,155 | -4,925 |
| Anacacho | 10,359 | -10,129 |
| Anacacho | 10,359 | -10,129 |
| Austin Chalk | 10,603 | -10,373 |
14 TOPS · FIRST 8
Guajillo Unit 15 South42-013-35772
0.0 KM · Marathon Oil EF LLC · Section with this well →
| Queen City | 2,741 | -2,511 |
| Reklaw | 3,094 | -2,864 |
| Carrizo | 3,728 | -3,498 |
| Wilcox | 5,155 | -4,925 |
| Anacacho | 10,366 | -10,136 |
| Austin Chalk | 10,615 | -10,385 |
| Olmos | — | |
| Navarro | — |
10 TOPS · FIRST 8
Guajillo Unit 14 South42-013-35848
0.6 KM · Marathon Oil EF LLC · Section with this well →
| Queen City | 2,505 | -2,236 |
| Reklaw | 3,210 | -2,941 |
| Carrizo | 3,895 | -3,626 |
| Wilcox | 5,810 | -5,541 |
| Anacacho | 10,422 | -10,153 |
| Austin Chalk | 10,660 | -10,391 |
| Bartosh | — | |
| Escondido | — |
10 TOPS · FIRST 8
Guajillo Unit 14 South42-013-35847
0.6 KM · Marathon Oil EF LLC · Section with this well →
| Queen City | 2,505 | -2,236 |
| Reklaw | 3,210 | -2,941 |
| Carrizo | 3,895 | -3,626 |
| Wilcox | 5,810 | -5,541 |
| Anacacho | 10,438 | -10,169 |
| Austin Chalk | 10,674 | -10,405 |
| Bartosh | — | |
| Olmos | — |
10 TOPS · FIRST 8
Guajillo Unit 14 South42-013-35846
0.6 KM · Marathon Oil EF LLC · Section with this well →
| Queen City | 2,505 | -2,237 |
| Reklaw | 3,210 | -2,942 |
| Carrizo | 3,895 | -3,627 |
| Wilcox | 5,125 | -4,857 |
| Anacacho | 10,450 | -10,182 |
| Austin Chalk | 10,686 | -10,418 |
| Escondido | — | |
| Bartosh | — |
10 TOPS · FIRST 8
Guajillo Unit 14 South42-013-35845
0.6 KM · Marathon Oil EF LLC · Section with this well →
| Queen City | 2,505 | -2,236 |
| Reklaw | 3,210 | -2,941 |
| Carrizo | 3,895 | -3,626 |
| Wilcox | 5,810 | -5,541 |
| Anacacho | 10,457 | -10,188 |
| Austin Chalk | 10,698 | -10,429 |
| Olmos | — | |
| Navarro | — |
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/01335768, documented in the API reference.