CHALK, MARY, -BE-

Oil · District 08 · Lease #16930

Operator: MARATHON OIL COMPANY

Cum Oil

27k BBL

Cum Gas

21 MCF

casinghead

Wells

5

Production

1993-01 — 2011-11

Peak Month

1993-10

Production History

Cum Oil: 27,206 BBL Cum Gas: 21 MCF

RRC production reported through Apr 2026 · recent months incomplete

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

Operator History (from monthly production reports)

2006-04 — 2012-08 LEGACY RESERVES OPERATING LP 77 mo
1999-11 — 2006-03 BROTHERS PRODUCTION COMPANY INC. 77 mo
1996-04 — 1999-10 MARATHON OIL COMPANY 43 mo
1993-01 — 1996-03 GUTHRIE, A. K. OPERATING CO. 39 mo

Wells (5)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
5EXTEX OPERATING COMPANY11,5001977-09-15
142-227-04133EXTEX OPERATING COMPANY------
242-227-04140EXTEX OPERATING COMPANY------
342-227-04144EXTEX OPERATING COMPANY------
4 D42-227-04136EXTEX OPERATING COMPANY------