HIERHOLZER RETZLOFF-MCMAHON SA1

Oil · District 01 · Lease #21771

Operator: MARATHON OIL EF LLC

Cum Oil

299k BBL

Cum Gas

413k MCF

casinghead

Wells

1

Production

2025-03 — 2026-04

Peak Month

2025-03

Production History

Cum Oil: 299,245 BBL Cum Gas: 413,491 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

40,366 BBL/mo

Di (annual)

374.7%

b-factor

1.7

EUR

1,800,966 BBL

R-squared

0.856

type

hyperbolic

Operator History (from monthly production reports)

2025-03 — 2026-07 MARATHON OIL EF LLC 17 mo

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
1HMARATHON OIL EF LLC124,0002024-08-01