GUAJILLO UNIT 12 SOUTH

Oil · District 02 · Lease #11258

Operator: MARATHON OIL EF LLC

Cum Oil

664k BBL

Cum Gas

1.4M MCF

casinghead

Wells

4

Production

2016-06 — 2026-04

Peak Month

2016-06

Production History

Cum Oil: 663,856 BBL Cum Gas: 1,440,895 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

157,808 BBL/mo

Di (annual)

874.6%

b-factor

0.8

EUR

841,676 BBL

R-squared

0.765

type

hyperbolic

Operator History (from monthly production reports)

2016-06 — 2026-07 MARATHON OIL EF LLC 122 mo

Wells (4)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
2HMARATHON OIL EF LLC217,1002015-10-22
3HMARATHON OIL EF LLC217,1002015-10-22
4HMARATHON OIL EF LLC217,1002015-10-21
1HMARATHON OIL EF LLC217,1002015-10-20