SIENKIEWICZ UNIT

Oil · District 02 · Lease #10797

Operator: MARATHON OIL EF LLC

Cum Oil

1.1M BBL

Cum Gas

3.9M MCF

casinghead

Wells

6

Production

2012-11 — 2026-02

Peak Month

2015-05

Production History

Cum Oil: 1,059,876 BBL Cum Gas: 3,875,722 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

40,509 BBL/mo

Di (annual)

111.4%

b-factor

0.4

EUR

721,384 BBL

R-squared

0.824

type

hyperbolic

Operator History (from monthly production reports)

2012-11 — 2026-07 MARATHON OIL EF LLC 165 mo

Wells (6)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
4HMARATHON OIL EF LLC319,0002015-09-04
505HMARATHON OIL EF LLC219,5002015-09-04
10HMARATHON OIL EF LLC119,5002014-10-08
503HMARATHON OIL EF LLC119,5002014-10-08
3HMARATHON OIL EF LLC115,5002012-06-07
2HMARATHON OIL EF LLC115,5002012-04-17