TURNBULL UNIT A-D-R. GRANDE SA5

Oil · District 02 · Lease #12688

Operator: MARATHON OIL EF LLC

Cum Oil

260k BBL

Cum Gas

693k MCF

casinghead

Wells

1

Production

2023-09 — 2026-04

Peak Month

2024-03

Production History

Cum Oil: 260,239 BBL Cum Gas: 693,177 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

39,886 BBL/mo

Di (annual)

468.4%

b-factor

0.8

EUR

374,319 BBL

R-squared

0.956

type

hyperbolic

Operator History (from monthly production reports)

2023-09 — 2026-07 MARATHON OIL EF LLC 35 mo

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
5HMARATHON OIL EF LLC122,0002023-05-26