BARNHART (EF)-J.M. PRESTON SA4

Oil · District 01 · Lease #21224

Operator: MARATHON OIL EF LLC

Cum Oil

340k BBL

Cum Gas

227k MCF

casinghead

Wells

1

Production

2023-10 — 2026-04

Peak Month

2023-11

Production History

Cum Oil: 340,306 BBL Cum Gas: 226,955 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

37,219 BBL/mo

Di (annual)

183.4%

b-factor

0.1

EUR

271,014 BBL

R-squared

0.853

type

hyperbolic

Operator History (from monthly production reports)

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

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
120HMARATHON OIL EF LLC124,0002023-12-11