CHAPMAN-PFEIL ALLOCATION

Oil · District 01 · Lease #18361

Operator: MARATHON OIL EF LLC

Cum Oil

276k BBL

Cum Gas

584k MCF

casinghead

Wells

1

Production

2015-01 — 2025-06

Peak Month

2015-02

Production History

Cum Oil: 276,215 BBL Cum Gas: 583,994 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

10,042 BBL/mo

Di (annual)

65.8%

b-factor

0.3

EUR

260,843 BBL

R-squared

0.811

type

hyperbolic

Operator History (from monthly production reports)

2015-01 — 2026-07 MARATHON OIL EF LLC 139 mo

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
3HMARATHON OIL EF LLC119,2002014-08-30