MARSHALL, MARY ANN

Oil · District 03 · Lease #17816

Operator: VALENCE OPERATING COMPANY

Cum Oil

330k BBL

Cum Gas

86 MCF

casinghead

Wells

1

Production

1993-01 — 2024-08

Peak Month

1994-05

Production History

Cum Oil: 330,214 BBL Cum Gas: 86 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

2,386 BBL/mo

Di (annual)

10.3%

b-factor

0.2

EUR

328,012 BBL

R-squared

0.546

type

hyperbolic

Operator History (from monthly production reports)

1993-10 — 2024-11 VALENCE OPERATING COMPANY 374 mo
1993-01 — 1993-09 FINA OIL & CHEMICAL COMPANY 9 mo

Wells (1)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
1VALENCE OPERATING COMPANY19,8001984-06-08