KOWALIK 228-1R

Oil · District 02 · Lease #10909

Operator: MARATHON OIL EF LLC

Cum Oil

799k BBL

Cum Gas

2.6M MCF

casinghead

Wells

10

Production

2014-09 — 2026-04

Peak Month

2015-11

Production History

Cum Oil: 798,531 BBL Cum Gas: 2,579,793 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

29,560 BBL/mo

Di (annual)

91.2%

b-factor

0.3

EUR

554,985 BBL

R-squared

0.658

type

hyperbolic

Operator History (from monthly production reports)

2014-09 — 2026-07 MARATHON OIL EF LLC 143 mo

Wells (10)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
10HMARATHON OIL EF LLC122,1302017-06-21
11HMARATHON OIL EF LLC122,1302017-06-21
12HMARATHON OIL EF LLC122,1302017-06-21
307HMARATHON OIL EF LLC117,4002014-10-27
6HMARATHON OIL EF LLC117,3002014-10-27
8HMARATHON OIL EF LLC117,5002014-10-27
5HMARATHON OIL EF LLC216,6002014-06-13
2HMARATHON OIL EF LLC118,5002014-04-18
3HMARATHON OIL EF LLC116,5002014-04-08
4HMARATHON OIL EF LLC116,5002014-04-07