CHALLENGER UNIT C

Oil · District 02 · Lease #10446

Operator: MARATHON OIL EF LLC

Cum Oil

3.9M BBL

Cum Gas

5.6M MCF

casinghead

Wells

10

Production

2013-02 — 2026-04

Peak Month

2017-11

Production History

Cum Oil: 3,855,382 BBL Cum Gas: 5,621,312 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

160,255 BBL/mo

Di (annual)

246.0%

b-factor

1.0

EUR

3,770,361 BBL

R-squared

0.951

type

hyperbolic

Operator History (from monthly production reports)

2013-02 — 2026-07 MARATHON OIL EF LLC 162 mo

Wells (10)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
2HMARATHON OIL EF LLC117,5002016-12-14
3HMARATHON OIL EF LLC117,5002016-12-14
4HMARATHON OIL EF LLC117,5002016-12-14
5HMARATHON OIL EF LLC217,5002016-12-14
6HMARATHON OIL EF LLC117,5002016-12-14
10HMARATHON OIL EF LLC118,5002014-11-18
11HMARATHON OIL EF LLC118,5002014-11-18
12HMARATHON OIL EF LLC118,5002014-11-18
9HMARATHON OIL EF LLC118,5002014-11-18
1HMARATHON OIL EF LLC116,0002012-11-08