42-177-34613
PRODUCING HorizontalBARNHART (EF)-J.M. PRESTON SA5
GONZALES County · District 1 · MARATHON OIL EF LLC · EAGLEVILLE (EAGLE FORD-1)
Permits
1
Max Depth
24,000 ft
First Permit
2023-12-11
Latest Activity
2023-12-11
Lifespan
< 1 yr
Regulatory Status
Schedule
ON SCHEDULE
Completion
2023-10-31
Shut-In
—
Plugged
—
P-5 Org Status: Active
Production Summary Production data is a work in progress — still being validated against RRC filings. Spot something off or have questions? [email protected]
Cum Oil
— bbl
Cum Gas
— mcf
First Production
2023-10
Last Production
2026-07
Lease Production
Production is reported at the lease level. View production data, decline curves, and history on the lease page.
Formation Tops (10) Elevation 223 ft (GL)
CSV| Formation | Top Depth (MD) | Subsea (+above / −below SL) |
|---|---|---|
| SPARTA | 1,168 ft | -945 ft |
| QUEEN CITY | 1,817 ft | -1,594 ft |
| REKLAW | 2,104 ft | -1,881 ft |
| CARRIZO | 2,648 ft | -2,425 ft |
| WILCOX - DISPOSAL (Wilcox) | 2,901 ft | -2,678 ft |
| ANACACHO | 8,697 ft | -8,474 ft |
| AUSTIN CHALK - H2S (Austin Chalk) | 8,831 ft | -8,608 ft |
| EAGLE FORD - H2S (Eagle Ford) | 9,283 ft | -9,060 ft |
| BUDA - H2S, DISPOSAL (Buda) | — | — |
| NAVARRO | — | — |
As reported by operators on W-2/G-1 completion filings (RRC wellbore records). Depths are measured depth; names appear as filed. Subsea = reported elevation − measured depth (negative = below sea level; vertical wellbores only). View filings & logs at RRC ↗
Offset Well Tops (nearest 8 wells with tops)
What nearby completed wells reported.
Nearest wells within 10 mi (surface locations). Click wells to select them, then open the cross-section to compare tops side by side (max 6 wells per section, including this one).
Perforations (1)
| Interval | Type |
|---|---|
| 9,641–19,565 ft | Perforated |
Casing (2)
| Size | Set Depth | Cement |
|---|---|---|
| 9.625" | 4,629 ft | 1,526 sx |
| 6" | 19,565 ft | 3,086 sx |
Permit History (1)
Applications (1)
Records & Logs
1 completion filing on record · 1 with log images at RRC.
Completion packets open directly (post-2011 filings include attached logs). Log images can't be deep-linked — clicking copies the API for you to paste.
Well Details
- Well Number
- 121H
- Max Depth
- 24,000 ft
- Drill Type
- Horizontal
- County
- GONZALES
- District
- 1
- Operator
- MARATHON OIL EF LLC
- Completed
- 2023-10-31
Operator
- Name
- MARATHON OIL EF LLC
- Location
- HOUSTON
- P-5 Status
- Active (filed 2025-09-26)
- Cum Oil (all leases)
- 409,189,156 bbl
- Cum Gas (all leases)
- 1,029,735,602 mcf
- Activities
- CSGD/G, CSGD/P, G/PUR, GTHS/C, GTHS/G, GTHS/O, OPRS/G, OPRS/O
- Total Permits
- 3,173