42-255-36376
PRODUCING HorizontalSPAHN-MIKKELSON UNIT
KARNES County · District 2 · MARATHON OIL EF LLC · EAGLEVILLE (EAGLE FORD-2)
Permits
1
Max Depth
22,000 ft
First Permit
2019-03-18
Latest Activity
2019-03-18
Lifespan
< 1 yr
Regulatory Status
Schedule
ON SCHEDULE
Completion
2020-01-16
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
2012-05
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 347 ft (GR)
CSV| Formation | Top Depth (MD) | Subsea (+above / −below SL) |
|---|---|---|
| YEGUA - DISPOSAL (Yegua) | 1,625 ft | -1,278 ft |
| QUEEN CITY | 3,796 ft | -3,449 ft |
| REKLAW | 4,230 ft | -3,883 ft |
| CARRIZO | 4,779 ft | -4,432 ft |
| WILCOX - DISPOSAL (Wilcox) | 6,093 ft | -5,746 ft |
| AUSTIN CHALK - H2S (Austin Chalk) | 11,560 ft | -11,213 ft |
| EAGLE FORD - H2S (Eagle Ford) | 11,801 ft | -11,454 ft |
| EDWARDS - H2S (Edwards) | — | — |
| FRIO - DISPOSAL (Frio) | — | — |
| SLIGO - H2S (Sligo) | — | — |
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 |
|---|---|
| 12,075–16,887 ft | Perforated |
Casing (2)
| Size | Set Depth | Cement |
|---|---|---|
| 9.625" | 5,643 ft | 1,642 sx |
| 5.5" | 16,944 ft | 2,795 sx |
Permit History (1)
Applications (1)
Records & Logs
4 completion filings on record · 3 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
- 503H
- Max Depth
- 22,000 ft
- Drill Type
- Horizontal
- County
- KARNES
- District
- 2
- Operator
- MARATHON OIL EF LLC
- Completed
- 2020-01-16
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