← Wells

42-013-36187

PRODUCING Horizontal

HIERHOLZER RETZLOFF-MCMAHON SA1

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

Permits

1

Max Depth

24,000 ft

First Permit

2024-08-01

Latest Activity

2024-08-01

Lifespan

< 1 yr

Regulatory Status

Schedule

ON SCHEDULE

Completion

—

Shut-In

—

Plugged

—

P-5 Org Status: Active

Production Summary

Cum Oil

— bbl

Cum Gas

— mcf

First Production

2025-03

Last Production

2026-07

Lease Production

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

Oil
production & DCA →

Formation Tops (10) Elevation 450 ft (GR)

CSV
FormationTop Depth (MD)Subsea (+above / −below SL)
QUEEN CITY 2,721 ft-2,271 ft
REKLAW 3,257 ft-2,807 ft
CARRIZO 3,983 ft-3,533 ft
WILCOX - DISPOSAL (Wilcox)4,107 ft-3,657 ft
ANACACHO - H2S (Anacacho)10,243 ft-9,793 ft
AUSTIN CHALK - H2S, DISPOSAL (Austin Chalk)10,368 ft-9,918 ft
BARTOSH ——
ESCONDIDO - H2S, DISPOSAL (Escondido)——
NAVARRO - H2S (Navarro)——
OLMOS - DISPOSAL (Olmos)——

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
✓ 42-013-36186 HIERHOLZER RETZLOFF-MCMAHON SA2 · MARATHON OIL EF LLC
0.0 mi
Queen City 2,721'Reklaw 3,257'Carrizo 3,983'Wilcox 4,107'Anacacho 10,235'Austin Chalk 10,362'Escondido —Bartosh —Olmos —Navarro —
✓ 42-013-36185 HIERHOLZER RETZLOFF-MCMAHON SA3 · MARATHON OIL EF LLC
0.0 mi
Queen City 2,778'Reklaw 3,376'Carrizo 4,083'Wilcox 4,202'Anacacho 10,238'Austin Chalk 10,367'Olmos —Escondido —Bartosh —Navarro —
✓ 42-013-35543 KOWRS ALLOCATION #5 · XTO ENERGY INC.
0.4 mi
Queen City 830'Carrizo 1,580'Olmos 1,820'Reklaw 1,900'Escondido 2,600'Bartosh 3,150'Navarro 3,600'Wilcox 4,660'Anacacho 10,223'Austin Chalk 10,235'Eagle Ford 10,552'
✓ 42-013-35520 KOWRS ALLOCATION #4 · XTO ENERGY INC.
0.4 mi
Queen City 830'Carrizo 1,580'Escondido 1,820'Reklaw 1,900'Olmos 2,600'Bartosh 3,150'Navarro 3,600'Wilcox 4,660'Anacacho 10,215'Austin Chalk 10,231'
✓ 42-013-35519 KOWRS ALLOCATION #3 · XTO ENERGY INC.
0.4 mi
Queen City 830'Carrizo 1,580'Escondido 1,820'Reklaw 1,900'Reklaw 1,902'Olmos 2,600'Bartosh 3,150'Navarro 3,600'Wilcox 4,660'Anacacho 10,220'Austin Chalk 10,231'
✓ 42-013-35542 KOWRS ALLOCATION #2 · XTO ENERGY INC.
0.4 mi
Queen City 830'Reklaw 1,580'Carrizo 1,580'Olmos 1,820'Reklaw 1,900'Carrizo 1,900'Escondido 2,600'Bartosh 3,150'Navarro 3,600'Wilcox 4,660'Anacacho 10,212'Austin Chalk 10,231' +1 more
✓ 42-013-35521 KOWR ALLOCATION #1 · XTO ENERGY INC.
0.4 mi
Queen City 830'Carrizo 1,580'Carrizo 1,581'Olmos 1,820'Anacacho 1,830'Reklaw 1,900'Escondido 2,600'Austin Chalk 3,050'Bartosh 3,150'Bartosh 3,151'Navarro 3,600'Navarro 3,602' +3 more
✓ 42-013-35411 CHAPMAN ROTHE UNIT · MARATHON OIL EF LLC
0.9 mi
Queen City 2,858'Reklaw 3,433'Bartosh 3,686'Carrizo 4,104'Wilcox 5,520'Navarro 8,670'Olmos 9,057'Anacacho 10,386'Austin Chalk 10,524'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
10,760–24,059 ftPerforated

Casing (2)

SizeSet DepthCement
9.625"5,048 ft1,405 sx
5.5"24,059 ft4,744 sx

Permit History (1)

#901580 Drill Final Completion

HIERHOLZER RETZLOFF-MCMAHON SA1 · 24,000 ft

2024-08-01

Spud 2024-10-23

Applications (1)

#901580 A MARATHON OIL EF LLC
received 2024-07-25

Records & Logs

1 completion filing on record · 1 with log images at RRC.

W-2/G-1 2025-05-08 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 28.806073
Lon -98.138688

Well Details

Well Number
1H
Max Depth
24,000 ft
Drill Type
Horizontal
County
ATASCOSA
District
1
Operator
MARATHON OIL EF LLC

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