BARNHART (EF)-J.M. PRESTON SA5

Oil · District 01 · Lease #21225

Operator: MARATHON OIL EF LLC

Cum Oil

481k BBL

Cum Gas

314k MCF

casinghead

Wells

1

Production

2023-10 — 2026-04

Peak Month

2023-11

Production History

Cum Oil: 481,220 BBL Cum Gas: 314,285 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

31,817 BBL/mo

Di (annual)

81.1%

b-factor

0.0

EUR

470,913 BBL

R-squared

0.771

type

exponential

Operator History (from monthly production reports)

2023-10 — 2026-07 MARATHON OIL EF LLC 34 mo

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
121HMARATHON OIL EF LLC124,0002023-12-11