HIERHOLZER SEEWALD RETZLOFF SA4

Oil · District 01 · Lease #21182

Operator: MARATHON OIL EF LLC

Cum Oil

277k BBL

Cum Gas

373k MCF

casinghead

Wells

1

Production

2023-08 — 2026-04

Peak Month

2024-03

Production History

Cum Oil: 276,609 BBL Cum Gas: 372,964 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

29,607 BBL/mo

Di (annual)

880.0%

b-factor

2.0

EUR

1,159,592 BBL

R-squared

0.772

type

hyperbolic

Operator History (from monthly production reports)

2023-08 — 2026-07 MARATHON OIL EF LLC 36 mo

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
4HMARATHON OIL EF LLC218,0002023-06-30