← Wells

42-255-38368

Horizontal

HIERHOLZER QUAD SA B

KARNES County · District 2 · MARATHON OIL EF LLC

Permits

1

Max Depth

17,500 ft

First Permit

2026-02-26

Latest Activity

2026-02-26

Lifespan

< 1 yr

Regulatory Status

Schedule

OFF SCHEDULE

Completion

—

Shut-In

—

Plugged

—

Formation Tops

No tops on file for this well. Formation tops come from W-2/G-1 completion filings — this well has none yet, which is normal for permits that were never drilled, dry holes plugged without a filing, or wells completed before digital records. The nearest completed wells below show what to expect at this location.

Check this well's filings at RRC ↗

Offset Well Tops (nearest 8 wells with tops)

What nearby completed wells reported — this well has no filings of its own yet.

Cross-section
✓ 42-255-37842 MAY-RYAN ABC-ATLAS SA · MARATHON OIL EF LLC
0.5 mi
Sparta 2,964'Queen City 3,266'Reklaw 3,798'Carrizo 4,446'Wilcox 4,504'Anacacho 10,873'Austin Chalk 11,015'Eagle Ford 11,193'Frio —Sligo —Yegua —Edwards —
✓ 42-255-37814 MAY-RYAN UNIT C-H.HEDTKE SA · MARATHON OIL EF LLC
0.5 mi
Sparta 2,964'Queen City 3,266'Reklaw 3,798'Carrizo 4,446'Wilcox 4,504'Anacacho 10,874'Austin Chalk 11,023'Eagle Ford 11,201'Yegua —Frio —Edwards —
✓ 42-255-37812 MAY-RYAN UNIT C · MARATHON OIL EF LLC
0.5 mi
Sparta 2,964'Queen City 3,266'Reklaw 3,798'Carrizo 4,446'Wilcox 4,504'Anacacho 10,890'Austin Chalk 11,011'Eagle Ford 11,194'Edwards —Sligo —Yegua —Frio —
✓ 42-255-37811 MAY-RYAN UNIT C · MARATHON OIL EF LLC
0.5 mi
Sparta 2,964'Queen City 3,266'Reklaw 3,798'Carrizo 4,446'Wilcox 4,504'Anacacho 10,890'Austin Chalk 11,011'Eagle Ford 11,194'Frio —Yegua —
✓ 42-255-37810 MAY-RYAN UNIT C · MARATHON OIL EF LLC
0.5 mi
Sparta 2,964'Queen City 3,266'Reklaw 3,798'Carrizo 4,446'Wilcox 4,504'Anacacho 10,864'Austin Chalk 11,013'Eagle Ford 11,185'Yegua —Sligo —Edwards —Frio —
✓ 42-255-37815 MAY-RYAN ABC-ATLAS SA · MARATHON OIL EF LLC
0.5 mi
Eagle Ford —Frio —Queen City —Edwards —Austin Chalk —Reklaw —Carrizo —Sligo —Yegua —Wilcox —
✓ 42-255-38050 BEAM MEYER-BALSER SA1 · MARATHON OIL EF LLC
0.8 mi
Queen City 3,075'Reklaw 3,773'Carrizo 4,392'Wilcox 4,492'Austin Chalk 10,989'Eagle Ford 11,193'Frio —Yegua —Sligo —Edwards —
✓ 42-255-38049 BEAM MEYER-RICHARD BUTLER B SA3 · MARATHON OIL EF LLC
0.8 mi
Queen City 3,075'Reklaw 3,773'Carrizo 4,392'Wilcox 4,492'Austin Chalk 10,987'Eagle Ford 11,190'Frio —Yegua —Sligo —Edwards —

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).

Permit History (1)

#913500 Drill

HIERHOLZER QUAD SA B · 17,500 ft

2026-02-26

Applications (1)

#913500 A MARATHON OIL EF LLC
received 2026-02-13

Records & Logs

No W-2/G-1 filings on record in the RRC wellbore file for this well.

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 28.827997
Lon -98.039531

Well Details

Well Number
1
Max Depth
17,500 ft
Drill Type
Horizontal
County
KARNES
District
2
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
3,166