BARNHART (EF)-J.M. PRESTON SA1

Oil · District 01 · Lease #21712

Operator: MARATHON OIL EF LLC

Cum Oil

220k BBL

Cum Gas

135k MCF

casinghead

Wells

1

Production

2025-01 — 2026-04

Peak Month

2025-02

Production History

Cum Oil: 219,611 BBL Cum Gas: 135,269 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

28,857 BBL/mo

Di (annual)

147.3%

b-factor

0.0

EUR

235,313 BBL

R-squared

0.878

type

exponential

Operator History (from monthly production reports)

2025-01 — 2026-07 MARATHON OIL EF LLC 19 mo

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
115HMARATHON OIL EF LLC122,0002024-04-25