KEYSTONE

Oil · District 10 · Lease #25393

Operator: WHITING OIL AND GAS CORPORATION

Cum Oil

15k BBL

Cum Gas

0 MCF

Wells

1

Production

1993-01 — 2011-03

Peak Month

1993-11

Production History

Cum Oil: 15,405 BBL Cum Gas: 0 MCF

Decline Curve Analysis

qi

134 BBL/mo

Di (annual)

6.7%

b-factor

0.0

EUR

23,103 BBL

R-squared

0.472

type

exponential

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
1SOUTHLAND ROYALTY COMPANY111,4021978-10-17
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