CHALK, G. O. -B-

Oil · District 10 · Lease #18988

Operator: CONOCOPHILLIPS COMPANY

Cum Oil

242k BBL

Cum Gas

0 MCF

Wells

10

Production

1993-01 — 2012-04

Peak Month

1993-08

Production History

Cum Oil: 241,880 BBL Cum Gas: 0 MCF

Decline Curve Analysis

qi

1,709 BBL/mo

Di (annual)

15.5%

b-factor

2.0

EUR

405,364 BBL

R-squared

0.679

type

hyperbolic

Wells (10)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
18CONOCO INC.23,1001987-02-11
17CONOCO INC.13,1001983-03-30
11CONOCO INC.13,9001981-12-22
16CONOCO INC.13,2001980-05-01
13W42-227-30341--------
14W42-227-30342--------
1542-227-31165--------
242-227-00516--------
342-227-00497--------
542-227-10056--------
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