CHALLENGER UNIT A

Oil · District 02 · Lease #10519

Operator: MARATHON OIL EF LLC

Cum Oil

2.9M BBL

Cum Gas

4.4M MCF

casinghead

Wells

11

Production

2012-02 — 2026-04

Peak Month

2014-08

Production History

Cum Oil: 2,928,480 BBL Cum Gas: 4,382,155 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

73,880 BBL/mo

Di (annual)

137.4%

b-factor

0.9

EUR

2,379,658 BBL

R-squared

0.736

type

hyperbolic

Operator History (from monthly production reports)

2012-02 — 2026-07 MARATHON OIL EF LLC 174 mo

Wells (11)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
11HMARATHON OIL EF LLC118,1002014-03-17
10HMARATHON OIL EF LLC118,0002014-03-15
7HMARATHON OIL EF LLC118,0002014-03-15
8HMARATHON OIL EF LLC118,1002014-03-15
9HMARATHON OIL EF LLC118,1002014-03-15
3HMARATHON OIL EF LLC118,3002013-10-25
4HMARATHON OIL EF LLC117,7002013-10-25
5HMARATHON OIL EF LLC117,0002013-10-25
6HMARATHON OIL EF LLC117,1002013-10-25
2HMARATHON OIL EF LLC217,0002013-08-09
1HMARATHON OIL EF LLC117,0002013-01-24