42-013-35416
PRODUCING HorizontalGUAJILLO UNIT 8 SOUTH
ATASCOSA County · District 1 · MARATHON OIL EF LLC · EAGLEVILLE (EAGLE FORD-1)
Permits
2
Max Depth
18,500 ft
First Permit
2016-11-08
Latest Activity
2016-11-08
Lifespan
< 1 yr
Regulatory Status
Schedule
ON SCHEDULE
Completion
2017-12-29
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
2017-12
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 251 ft (GR)
CSV| Formation | Top Depth (MD) | Subsea (+above / −below SL) |
|---|---|---|
| QUEEN CITY | 3,035 ft | -2,784 ft |
| REKLAW | 3,396 ft | -3,145 ft |
| BARTOSH | 3,795 ft | -3,544 ft |
| CARRIZO | 4,036 ft | -3,785 ft |
| WILCOX - DISPOSAL (Wilcox) | 5,324 ft | -5,073 ft |
| NAVARRO - H2S (Navarro) | 8,987 ft | -8,736 ft |
| OLMOS - DISPOSAL (Olmos) | 9,323 ft | -9,072 ft |
| ANACACHO - H2S (Anacacho) | 10,792 ft | -10,541 ft |
| AUSTIN CHALK - H2S, DISPOSAL (Austin Chalk) | 11,031 ft | -10,780 ft |
| ESCONDIDO - H2S, DISPOSAL (Escondido) | — | — |
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 |
|---|---|
| 11,509–17,782 ft | Perforated |
Casing (2)
| Size | Set Depth | Cement |
|---|---|---|
| 9.625" | 5,363 ft | 1,741 sx |
| 5.5" | 17,887 ft | 3,157 sx |
Permit History (2)
Applications (2)
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
- 4H
- Max Depth
- 18,500 ft
- Drill Type
- Horizontal
- County
- ATASCOSA
- District
- 1
- Operator
- MARATHON OIL EF LLC
- Completed
- 2017-12-29
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