HIERHOLZER-CHAPMAN SA

Oil · District 01 · Lease #21193

Operator: MARATHON OIL EF LLC

Cum Oil

304k BBL

Cum Gas

296k MCF

casinghead

Wells

1

Production

2023-08 — 2026-04

Peak Month

2024-03

Production History

Cum Oil: 303,976 BBL Cum Gas: 296,102 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

27,193 BBL/mo

Di (annual)

193.5%

b-factor

1.1

EUR

893,806 BBL

R-squared

0.962

type

hyperbolic

Operator History (from monthly production reports)

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

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
1HMARATHON OIL EF LLC218,0002023-06-26