UNIVERSITY -154-

Oil · District 08 · Lease #10925

Operator: LEGACY RESERVES OPERATING LP

Cum Oil

350k BBL

Cum Gas

193k MCF

casinghead

Wells

5

Production

1993-01 — 2026-04

Peak Month

1996-10

Production History

Cum Oil: 350,031 BBL Cum Gas: 193,493 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

3,082 BBL/mo

Di (annual)

12.8%

b-factor

0.0

EUR

288,391 BBL

R-squared

0.823

type

exponential

Operator History (from monthly production reports)

2023-03 — 2026-07 HIGHMARK ENERGY OPERATING, LLC 41 mo
2013-01 — 2023-02 LEGACY RESERVES OPERATING LP 122 mo
2009-01 — 2012-12 COG OPERATING LLC 48 mo
2001-04 — 2008-12 HENRY PETROLEUM LP 93 mo
1993-01 — 2001-03 HENRY PETROLEUM CORP. 99 mo

Wells (5)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
22HIGHMARK ENERGY OPERATING, LLC17,2001996-07-02
23HIGHMARK ENERGY OPERATING, LLC17,2001996-07-02
5HIGHMARK ENERGY OPERATING, LLC39,8881995-10-19
21HIGHMARK ENERGY OPERATING, LLC17,4001993-02-05
7HIGHMARK ENERGY OPERATING, LLC18,2901978-04-27