CHALLENGER UNIT B

Oil · District 2 · Lease #10434

Operator: MARATHON OIL EF LLC

Cum Oil

2.6M BBL

Cum Gas

0 MCF

Wells

9

Production

2013-02 — 2026-03

Peak Month

2014-03

Production History

Cum Oil: 2,593,194 BBL Cum Gas: 0 MCF

Decline Curve Analysis

qi

39,330 BBL/mo

Di (annual)

46.1%

b-factor

0.6

EUR

2,136,724 BBL

R-squared

0.627

type

hyperbolic

Wells (9)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
4HMARATHON OIL EF LLC117,2002013-09-30
3HMARATHON OIL EF LLC117,2002013-09-27
5HMARATHON OIL EF LLC117,3002013-09-27
6HMARATHON OIL EF LLC117,1002013-09-27
7HMARATHON OIL EF LLC217,3002013-08-06
8HMARATHON OIL EF LLC217,2002013-08-06
9HMARATHON OIL EF LLC217,5002013-08-06
2HMARATHON OIL EF LLC116,7002013-01-24
1HMARATHON OIL EF LLC117,0002012-11-30
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