< leases

LOCKHART BANK UNIT NO. 3

Oil · District 03 · Lease #20075

Operator: SHERIDAN ENERGY,INC.

Fields: ALVIN, SOUTH (39 SEG. D)

Cum Oil

39k BBL

Cum Gas

63k MCF

casinghead

Wells

2

Production

1993-01 — 1998-04

Peak Month

1993-12

Production History

Cum Oil: 39,171 BBL Cum Gas: 63,431 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

1,284 BBL/mo

Di (annual)

35.3%

b-factor

0.0

EUR

43,572 BBL

R-squared

0.652

type

exponential

Operator History (from monthly production reports)

2006-01 — 2008-03 ROSETTA RESOURCES OPERATING LP 27 mo
2002-08 — 2005-12 CALPINE NATURAL GAS L.P. 41 mo
2002-05 — 2002-07 CALPINE NATURAL GAS COMPANY L.P. 3 mo
2000-03 — 2002-04 CALPINE NATURAL GAS COMPANY 26 mo
1997-12 — 2000-02 SHERIDAN ENERGY,INC. 27 mo
1997-11 — 1997-11 PIONEER RESOURCES PRODUCING, L.P 1 mo
1995-02 — 1997-10 PARKER & PARSLEY PRODUCING L.P. 33 mo
1994-10 — 1995-01 PARKER & PARSLEY DEVELOPMENT L.P 4 mo
1993-01 — 1994-09 BRIDGE OIL COMPANY, L. P. 21 mo

Wells (2)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
342-039-31871CORNERSTONE ENERGY, INC.712,5002013-01-10
142-039-31826DRILLMAR ENERGY, INC.612,5002002-11-01