NORTH BLOCK 12 UNIT

Oil // district 10 // lease#19954

op: VISTA RESOURCES, INC. (A)

cum_oil

587k BBL

cum_gas

0 MCF

wells

4

production

1993-01 — 2026-03

peak_month

1993-01

-- production_history

cum_oil: 586,840 BBL cum_gas: 0 MCF

-- decline_curve_analysis

qi

10,938 BBL/mo

Di (annual)

19.3%

b-factor

0.0

EUR

679,527 BBL

R-squared

0.304

type

exponential

-- wells (4)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
10COSTILLA PETROLEUM CORPORATION111,5001996-09-17
8CONOCO INC.211,7001992-05-29
7CONOCO INC.18,7751983-05-25
242-003-00975--------
EOF // data source: Texas Railroad Commission // 2026