CHALK, MARY, -BE-

Oil · District 10 · Lease #16930

Operator: MARATHON OIL COMPANY

Cum Oil

27k BBL

Cum Gas

0 MCF

Wells

5

Production

1993-01 — 2012-08

Peak Month

1993-10

Production History

Cum Oil: 27,206 BBL Cum Gas: 0 MCF

Decline Curve Analysis

qi

262 BBL/mo

Di (annual)

14.3%

b-factor

0.3

EUR

29,189 BBL

R-squared

0.786

type

hyperbolic

Wells (5)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
5GUTHRIE, A. K. OPERATING CO.11,5001977-09-15
142-227-04133--------
242-227-04140--------
342-227-04144--------
4 D42-227-04136--------
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