HALL-MANNING

Oil · District 01 · Lease #18030

Operator: MARATHON OIL EF LLC

Cum Oil

564k BBL

Cum Gas

609k MCF

casinghead

Wells

4

Production

2014-08 — 2026-04

Peak Month

2014-09

Production History

Cum Oil: 563,636 BBL Cum Gas: 608,923 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

24,649 BBL/mo

Di (annual)

145.7%

b-factor

0.3

EUR

290,041 BBL

R-squared

0.814

type

hyperbolic

Operator History (from monthly production reports)

2014-08 — 2026-07 MARATHON OIL EF LLC 144 mo

Wells (4)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
4HMARATHON OIL EF LLC123,0002021-12-10
1HMARATHON OIL EF LLC117,5002014-05-14
2HMARATHON OIL EF LLC117,5002014-05-14
11HMARATHON OIL EF LLC117,5002012-07-02