CHALK -A-

Oil · District 10 · Lease #31394

Operator: EXCEL ENERGY CO.

Cum Oil

188k BBL

Cum Gas

0 MCF

Wells

8

Production

1993-01 — 2012-03

Peak Month

1993-05

Production History

Cum Oil: 188,410 BBL Cum Gas: 0 MCF

Decline Curve Analysis

qi

1,065 BBL/mo

Di (annual)

3.9%

b-factor

1.3

EUR

368,119 BBL

R-squared

0.782

type

hyperbolic

Wells (8)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
9CALLEY, BOB13,1001986-12-16
8CALLEY, BOB13,1001986-08-14
142-227-00163--------
242-227-04330--------
342-227-02479--------
542-227-02478--------
642-227-02481--------
742-227-30036--------
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