STATE TRACT 470

Oil · District 04 · Lease #12491

Operator: CHAPARRAL (USA) ENERGY, INC.

Fields: MUSTANG ISLAND, W. ( 5-A SD.)

Cum Oil

151k BBL

Cum Gas

392k MCF

casinghead

Wells

1

Production

1995-08 — 2012-10

Peak Month

1995-10

Production History

Cum Oil: 150,855 BBL Cum Gas: 392,392 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

2,493 BBL/mo

Di (annual)

18.9%

b-factor

0.0

EUR

158,011 BBL

R-squared

0.722

type

exponential

Operator History (from monthly production reports)

2002-10 — 2013-07 CHAPARRAL ENERGY, L.L.C. 130 mo

2000-10 — 2002-09 CHAPARRAL (USA) ENERGY, INC. 24 mo

1995-08 — 2000-09 BRISTOL RESOURCES CORPORATION 62 mo

Wells (1)

WELL#	API	OPERATOR	PERMITS	DEPTH	LAST_ISSUED
7	42-355-32033	ARCO OIL & GAS CO.	6	9,707	1993-12-14