74-ATASCOSA UNIT 1

Oil · District 01 · Lease #21817

Operator: MARATHON OIL EF LLC

Cum Oil

10k BBL

Cum Gas

15k MCF

casinghead

Wells

4

Production

2025-10 — 2026-04

Peak Month

2025-10

Production History

Cum Oil: 9,747 BBL Cum Gas: 14,717 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

1,548 BBL/mo

Di (annual)

55.4%

b-factor

2.0

EUR

218,316 BBL

R-squared

0.608

type

hyperbolic

Operator History (from monthly production reports)

2025-10 — 2026-07 MARATHON OIL EF LLC 10 mo

Wells (4)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
13HMARATHON OIL EF LLC122,0002021-01-15
3MARATHON OIL EF LLC113,5002011-06-10
4MARATHON OIL EF LLC113,5002011-06-10
1MARATHON OIL EF LLC113,5002011-05-19