BARNHART (EF)-J.M. PRESTON SA8

Oil · District 01 · Lease #21149

Operator: MARATHON OIL EF LLC

Cum Oil

176k BBL

Cum Gas

269k MCF

casinghead

Wells

1

Production

2023-08 — 2026-04

Peak Month

2023-08

Production History

Cum Oil: 175,856 BBL Cum Gas: 269,266 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

17,950 BBL/mo

Di (annual)

778.0%

b-factor

1.4

EUR

350,646 BBL

R-squared

0.661

type

hyperbolic

Operator History (from monthly production reports)

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

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
46HMARATHON OIL EF LLC126,0002023-03-09