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42-013-34409

Final Completion Horizontal

RETZLOFF-TOM UNIT

ATASCOSA County · District 1 · MARATHON OIL EF LLC · EAGLEVILLE (EAGLE FORD-2)

Permits

2

Max Depth

16,000 ft

First Permit

2011-08-09

Latest Activity

2019-08-21

Lifespan

8 yrs

Regulatory Status

Schedule

OFF SCHEDULE

Completion

2011-10-11

Shut-In

—

Plugged

—

Production Summary

Cum Oil

— bbl

Cum Gas

— mcf

First Production

2011-10

Last Production

2026-07

Operator History

Chain of Custody

HILCORP ENERGY COMPANY 2011-2011→ MARATHON OIL EF LLC 2011-2021

Lease Production

Production is reported at the lease level. View production data, decline curves, and history on the lease page.

Oil
production & DCA →
Oil
production & DCA →

Formation Tops (6) Elevation 389 ft (GL)

CSV
FormationTop Depth (MD)Subsea (+above / −below SL)
ANACACHO 10,500 ft-10,111 ft
AUSTIN (Austin Chalk)10,660 ft-10,271 ft
AUSTIN CHALK 10,660 ft-10,271 ft
EAGLE FORD 10,787 ft-10,398 ft
EAGLE FORD 10,870 ft-10,481 ft
EAGLEFORD (Eagle Ford)10,870 ft-10,481 ft

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.

Cross-section
✓ 42-013-35830 TOM FAMILY-RETZLOFF SA3 · MARATHON OIL EF LLC
0.3 mi
Queen City 2,714'Reklaw 3,294'Carrizo 3,969'Wilcox 4,044'Olmos 9,054'Anacacho 10,449'Austin Chalk 10,612'Escondido —Bartosh —Navarro —
✓ 42-013-35829 TOM FAMILY-RETZLOFF SA2 · MARATHON OIL EF LLC
0.3 mi
Queen City 2,714'Reklaw 3,294'Carrizo 3,696'Carrizo 3,969'Wilcox 4,044'Wilcox 6,844'Olmos 9,054'Anacacho 10,445'Austin Chalk 10,608'Navarro —Bartosh —Escondido —
✓ 42-013-35828 TOM FAMILY-RETZLOFF SA1 · MARATHON OIL EF LLC
0.3 mi
Queen City 2,714'Reklaw 3,294'Carrizo 3,969'Wilcox 4,044'Olmos 9,054'Anacacho 10,450'Austin Chalk 10,610'Bartosh —Escondido —Navarro —
✓ 42-013-35978 RETZLOFF MAY-MAUCH KRUEGER SA · MARATHON OIL EF LLC
0.7 mi
Queen City 2,617'Reklaw 3,171'Carrizo 3,985'Wilcox 4,061'Anacacho 10,409'Austin Chalk 10,574'Olmos —Escondido —Navarro —Bartosh —
✓ 42-013-35977 MAUCH TOM KRUEGER-ETHRIDGE SA · MARATHON OIL EF LLC
0.7 mi
Queen City 1,791'Reklaw 3,171'Carrizo 3,895'Wilcox 4,061'Anacacho 10,408'Austin Chalk 10,571'Olmos —Bartosh —Navarro —Escondido —
✓ 42-013-35976 MAUCH TOM KRUEGER SA2 · MARATHON OIL EF LLC
0.7 mi
Queen City 2,617'Reklaw 3,171'Carrizo 3,985'Wilcox 4,061'Anacacho 10,409'Austin Chalk 10,569'Bartosh —Escondido —Olmos —Navarro —
✓ 42-013-35667 RETZLOFF TOM-MAY PSA A · MARATHON OIL EF LLC
1.0 mi
Queen City 3,095'Reklaw 3,457'Bartosh 3,661'Carrizo 4,104'Wilcox 5,439'Navarro 8,777'Olmos 9,287'Anacacho 10,713'Austin Chalk 10,902'Escondido —
✓ 42-013-35668 RETZLOFF TOM-MAY PSA B · MARATHON OIL EF LLC
1.0 mi
Queen City 3,095'Reklaw 3,457'Bartosh 3,661'Carrizo 4,104'Wilcox 5,439'Navarro 8,777'Olmos 9,287'Escondido 9,287'Anacacho 10,702'Austin Chalk 10,904'Olmos —Escondido —

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)

IntervalType
11,031–14,632 ftPerforated

Casing (2)

SizeSet DepthCement
10.75"5,318 ft2,225 sx
5.5"14,730 ft2,100 sx

Permit History (2)

#855965 Field Transfer Final Completion

RETZLOFF-TOM UNIT · 16,000 ft

2019-08-21

Spud 2019-07-29

#721624 Drill Final Completion

RETZLOFF-TOM UNIT · 13,500 ft

2011-08-09

Spud 2011-09-17

Applications (2)

#855965 A MARATHON OIL EF LLC
received 2019-08-06
#721624 A HILCORP ENERGY COMPANY
received 2011-08-04

Records & Logs

4 completion filings on record · 2 with log images at RRC.

W-2/G-1 2024-08-19
W-2/G-1 2023-09-05
W-2/G-1 2019-08-31 log on file
W-2/G-1 2011-11-07 log on file
Completion packets + logs ↗ Wellbore filings ↗

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.

Google Maps → Explorer Map →
Lat 28.747583
Lon -98.177462

Well Details

Well Number
1H
Max Depth
16,000 ft
Drill Type
Horizontal
County
ATASCOSA
District
1
Operator
MARATHON OIL EF LLC
Completed
2011-10-11

Operator

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