THOMAS UNIT

Oil · District 8A · Lease #68520

Operator: SCHALK OIL COMPANY, INC.

Cum Oil

298k BBL

Cum Gas

28 MCF

casinghead

Wells

1

Production

2003-01 — 2026-04

Peak Month

2003-03

Production History

Cum Oil: 297,951 BBL Cum Gas: 28 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

3,368 BBL/mo

Di (annual)

14.6%

b-factor

0.0

EUR

276,386 BBL

R-squared

0.861

type

exponential

Operator History (from monthly production reports)

2003-01 — 2026-07 SCHALK OIL COMPANY, INC. 283 mo

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
1SCHALK OIL COMPANY, INC.15,3002002-11-21