POWELL -4- A

Oil · District 08 · Lease #33525

Operator: VANGUARD PERMIAN, LLC

Fields: COBRA (WOLFCAMP)

Cum Oil

1.5M BBL

Cum Gas

1.3M MCF

casinghead

Wells

1

Production

1993-01 — 2020-09

Peak Month

2002-03

Production History

Cum Oil: 1,480,505 BBL Cum Gas: 1,343,532 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

12,778 BBL/mo

Di (annual)

29.5%

b-factor

0.1

EUR

577,553 BBL

R-squared

0.941

type

hyperbolic

Operator History (from monthly production reports)

2017-07 — current OXY USA INC. 39 mo

2015-05 — 2017-06 VANGUARD OPERATING, LLC 26 mo

2013-04 — 2015-04 VANGUARD PERMIAN, LLC 25 mo

1998-09 — 2013-03 RANGE PRODUCTION COMPANY 175 mo

1998-04 — 1998-08 LOMAK PRODUCTION COMPANY 5 mo

1993-01 — 1998-03 TREND EXPLORATION COMPANY 63 mo

Wells (1)

WELL#	API	OPERATOR	PERMITS	DEPTH	LAST_ISSUED
23D	42-173-32210	OXY USA INC.	1	8,400	1992-06-22