Hydrogeochemistry of shallow gas accumulations in fractured Devonian black shales Dr. Jennifer McIntosh, Department of Hydrology and Water Resources, University of Arizona, Tucton, AZ 85721 800
Adirondack Uplift
1)
Huron
440
n ui nq o g Al
420
Lak
MI
Ar
ch
Summary of major results:
740
760
780
Lake
N
820
dilution of Devonian Shale Chemical isotopewaters brines by and recharge analyses of coproduced different than modern natural gas and formation meteoric waters.
440
Lake Ontario
ON
100 km
rie eE
NY PA
42
Fin
dla y
Arc
h
OH
0
860
WV
KY
2.0-2.9 4.0-4.9 >5.0
840
820
50
740
760
780
800
400
1.0-1.9 3.0-3.9
60
Alkalinity (meq/kg)
Upper Devonian Organic-Rich Shale CAI Map
All egh eny Val Fro l ey nt and Rid ge
380
Cin cin nat iA rch
400
Antrim and New Albany shale biogenic gas wells
40
30
380
depth, while microbial methanogenesis is important High δ13C-DIC values (up to at depth in select locations. 30 per mil) with relatively low
0 -30
-20
-10
0
10
δ 13CDIC (‰)
20
30
40
-4
-6
-8
-10
Range in modern precipitation -12
alkalinities (
