BLALOCK -33-

Oil · District 08 · Lease #40898

Operator: XTO ENERGY INC.

Fields: SPRABERRY (TREND AREA)

Cum Oil

64k BBL

Cum Gas

424k MCF

casinghead

Wells

2

Production

2011-01 — 2026-04

Peak Month

2011-03

Production History

Cum Oil: 63,962 BBL Cum Gas: 423,572 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

1,045 BBL/mo

Di (annual)

287.5%

b-factor

2.0

EUR

69,742 BBL

R-squared

0.317

type

hyperbolic

Operator History (from monthly production reports)

2014-11 — 2026-07 XTO ENERGY INC. 141 mo

2014-07 — 2014-10 LINN OPERATING, INC. 4 mo

2012-02 — 2014-06 BERRY OIL COMP. 29 mo

2011-03 — 2012-01 ROCA OPERATING, INC. 11 mo

2011-01 — 2011-02 PIEDRA OPERATING, LLC 2 mo

Wells (2)

WELL#	API	OPERATOR	PERMITS	DEPTH	LAST_ISSUED
5	42-173-34038	XTO ENERGY INC.	2	11,500	2013-10-26
4	42-173-33772	XTO ENERGY INC.	1	11,000	2010-08-27