TEXAS · WELLS · ZAPATA COUNTY · MARSHALL, S. G. LEASE · API 42-505-36412 · DISTRICT 04
Marshall S. G. #39
Zapata County · J. C. Martin (Lobo) field · Producing · Vertical
Marshall S. G. #39 (API 42-505-36412) is a well in Zapata County operated by Hilcorp Energy Company, completed May 28, 2009 and listed as producing on the RRC schedule, shut in August 1, 2026.
The RRC has issued one drilling permit, issued March 20, 2009, permitted to 10,793 ft.
It was permitted by Chevron U. S. A. Inc. and has since transferred to Hilcorp Energy Company on the wellbore schedule.
Completion filings report 6 formation tops, including Queen City, Wilcox, Big Blue, Base Of Big Blue.
Its lease has reported 134 barrels of oil and 614K mcf of gas since May 2009, last reporting volume in April 2026.
Operator of record
Permitted by Chevron U. S. A. Inc.; the EWA schedule now lists a different operator.
- Based in
- Houston, TX
- P-5 status
- Active – Extension (X)
- P-5 last filed
- Mar 27, 2026
- Permits on file
- 3,454
- Phone
- (713) 209-2400
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Hilcorp Energy Company |
| Production reports | Hilcorp Energy Companythrough Apr 2026 |
| Latest permit | Chevron U. S. A. Inc.Mar 20, 2009 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 10,793
- total depth, ft
- 1
- permits on file
- Mar 20, 2009
- last permit issued
- May 28, 2009
- completed
- 134
- cumulative oil, bbl
- 614K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · May 2009 THROUGH Apr 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- May 28, 2009
- Shut in
- Aug 1, 2026
- Plugged
- —
Operator's P-5 on the schedule: Active (A)
Surface location
No coordinates on the permit record yet. The RRC's GIS record usually lands within days of issuance; historical master-file permits never carry one.
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 |
|---|---|---|---|---|---|---|
| Marshall, S. G. G-4-249368 | J. C. Martin (Lobo) | Hilcorp Energy Company | 1 | 134 | 614K | May 2009 – Apr 2026 |
Gas, mcf lease total
Last 12 months 1,379 · prior 12 1,110(+24%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Chevron U. S. A. Inc.May 2009 → Aug 2014
- 2Hilcorp Energy CompanySep 2014 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 679645-99 | Drill | Chevron U. S. A. Inc. | Mar 19, 2009 | Mar 20, 2009 | Apr 18, 2009 | 11,800 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| May 28, 2009 | Marshall S. G. G-4-249368 | J. C. Martin (Lobo) | Hilcorp Energy Company | Producing · shut in Aug 1, 2026 | 10,793 |
Formation tops
As filed on W-2/G-1. Subsea from 410 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Queen City | 3,060 | -2,650 |
| Wilcox | 4,780 | -4,370 |
| Big Blue | 6,710 | -6,300 |
| Base of Big Blue | 6,810 | -6,400 |
| Lobo Unconformity | 8,950 | -8,540 |
| Lobo 1 | 9,270 | -8,860 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 9,294 | 9,304 | Perforated |
| 9,372 | 9,386 | Perforated |
| 10,184 | 10,194 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 996 | 12.25 | 331 S |
| 7 | 7,100 | 8.75 | 302 S |
| 2.875 | 10,793 | 6.25 | 544 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. The record date is the RRC's own date on the record, not the day the report was filed: 462,034 of the state's filings carry 1984-01-12. About these reports →
| Suffix | RRC record date | W-2 / G-1 date | Logs referenced |
|---|---|---|---|
| 00 | Aug 19, 2009 | Jul 8, 2009 | Yes |
| 00 | Jul 17, 2009 | — | — |
Well logs
1 log loaded from the RRC's log index, the latest received Jun 13, 2012. Density, Neutron, Resistivity. These are the logs loaded into Petrora from the Railroad Commission's inventories, not necessarily every log run on the well. The RRC holds the files; each opens from its log search for the well. The kind is the RRC's description of the log; the interval is the one filed for it.
Open the RRC's log search for this well ↗| Logas described | Files | Intervalft, as filed | Datereceived | SizeMB |
|---|---|---|---|---|
| COMBINATION: RESISTIVITY/NEUTRON/DENSITY POROSITYSpans Queen City, Wilcox, Big Blue, Base Of Big Blue, Lobo Unconformity, Lobo 1 | TIFF | 200 to 10,809 | Jun 13, 2012run Apr 28, 2009 | 3.05 |
"Spans" is by this well's own filed formation tops: a formation runs from its top to the next deeper top filed, and the deepest runs to the bottom of the log. Depths are measured along the wellbore, so on a horizontal the lateral counts in the formation it was landed in.
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 42-505-36412 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-505-36412 → scanned completion filings
The logs loaded for this well are under Well logs, with the RRC's log search for it.
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/50536412, documented in the API reference.