HIERHOLZER SEEWALD UNIT

Oil · District 01 · Lease #15599

Operator: MARATHON OIL EF LLC

Cum Oil

189k BBL

Cum Gas

214k MCF

casinghead

Wells

1

Production

2011-05 — 2026-03

Peak Month

2011-06

Production History

Cum Oil: 189,330 BBL Cum Gas: 214,182 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

6,082 BBL/mo

Di (annual)

61.3%

b-factor

0.4

EUR

194,410 BBL

R-squared

0.676

type

hyperbolic

Operator History (from monthly production reports)

2011-11 — 2026-07 MARATHON OIL EF LLC 177 mo
2011-05 — 2011-10 HILCORP ENERGY COMPANY 6 mo

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
1HMARATHON OIL EF LLC113,5002011-02-17