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PROPERTIES OF SUBSURFACE FLUIDS 57
TEMPERATURE OF
3
I NORMAL THERMAL
GRADIENT I8.Z0C/km
(I.O"F/IOO FT.) -
6':
E
- 2 \ -'\. 0
-
x
*
W
r \. I-
I- W
n 3 k
W I
O? t
n
W
n
30.O0C/km 12
(1.7"F/IOO FT) '\ ,
4
16
! I l \ l
50 IO0 I50 200
TEMPERATURE OC
Figure 2.11. Subsurface temperature gradient showing the change within the
geopressured zone. me 36.5"C/km gradient was included for reference only.
PRESSURE (PSI x 10-3)
0 2 4 6 8 IO 12 14 16 18
I l l I 1 I l l
-3
-
-6
':
,GEOPRESSURED ZONE 9
t
I
t-
n
W
PRESSURE (mPa)
Figure 2.12. Subsurface pressure gradients showing the change in hydrostatic
pressure gradient within the geopressured zone.
