42-013-35479
PRODUCING HorizontalGUAJILLO UNIT 16 NORTH
ATASCOSA County · District 1 · MARATHON OIL EF LLC · EAGLEVILLE (EAGLE FORD-1)
Permits
2
Max Depth
19,400 ft
First Permit
2017-05-08
Latest Activity
2017-05-08
Lifespan
< 1 yr
Regulatory Status
Schedule
ON SCHEDULE
Completion
2019-11-14
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
2018-10
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 5,250 ft (GR)
CSV| Formation | Top Depth (MD) | Subsea (+above / −below SL) |
|---|---|---|
| QUEEN CITY | 2,991 ft | +2,259 ft |
| REKLAW | 3,353 ft | +1,897 ft |
| BARTOSH | 3,752 ft | +1,498 ft |
| CARRIZO | 3,993 ft | +1,257 ft |
| WILCOX - DISPOSAL (Wilcox) | 5,281 ft | -31 ft |
| NAVARRO - H2S (Navarro) | 8,943 ft | -3,693 ft |
| OLMOS - DISPOSAL (Olmos) | 9,279 ft | -4,029 ft |
| ANACACHO - H2S (Anacacho) | 10,769 ft | -5,519 ft |
| AUSTIN CHALK - H2S, DISPOSAL (Austin Chalk) | 11,023 ft | -5,773 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 |
|---|---|
| 11,369–18,201 ft | Perforated |
Casing (2)
| Size | Set Depth | Cement |
|---|---|---|
| 9.625" | 5,381 ft | 1,735 sx |
| 5.5" | 18,310 ft | 3,246 sx |
Permit History (2)
Applications (2)
Records & Logs
3 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
- 4H
- Max Depth
- 19,400 ft
- Drill Type
- Horizontal
- County
- ATASCOSA
- District
- 1
- Operator
- MARATHON OIL EF LLC
- Completed
- 2019-11-14
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