Geothermal handbook: PlanninG and Financing power Generation t e c h n I c a L r e p o r t 2 / 2

geo-pressured systems
are analogous to geo-pressured oil and gas reservoirs in which
fluid caught in stratigraphic traps may have pressures close to lithostatic values.
Such systems are generally fairly deep. 
• 
hot dry rock (hdr) or enhanced (engineered) geothermal systems (eGS) 
consist of volumes of
rock that have been heated by volcanism or abnormally high heat flow, but that have low
6
The following discussion is based on Saemundsson, Axelsson, and Steingrímsson 2011. 

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17
C h a p t e r 1
F I g u r E 1 . 4
Conceptual Model of a High Temperature Field within a Rifting Volcanic System 
Source | Saemundsson, Axelsson, and Steingrímsson 2011. 
 
 
 
 
 
Magmatic 
Intrusion
Hot Upflow
Recharge
Low
Permeability
Fumaroles/
Steam Vents
km
0
1
2
3
4
5
0 
200 
400 
600
T [
o
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