HIERHOLZER SEEWALD RETZLOFF SA3

Oil · District 01 · Lease #21175

Operator: MARATHON OIL EF LLC

Cum Oil

235k BBL

Cum Gas

240k MCF

casinghead

Wells

1

Production

2023-08 — 2026-04

Peak Month

2024-04

Production History

Cum Oil: 234,661 BBL Cum Gas: 239,872 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

40,811 BBL/mo

Di (annual)

248.5%

b-factor

0.0

EUR

197,767 BBL

R-squared

0.814

type

exponential

Operator History (from monthly production reports)

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

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
3HMARATHON OIL EF LLC218,0002023-06-30