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The global energy sector from a subsurface perspective

Geothermal

Fracture connectivity and power laws

Henk Kombrink
It was about a year ago that I heard about a deep geothermal drilling project in Finland (St1 Deep Heat Project), during which a couple of 6 km deep wells…

The hidden lithium treasure of South Australia

Geoff Freer, Hydro Lit
Despite receiving just 165 mm of rain annu­ally, Coopers Creek flows year-round, an anomaly that has lured generations of explorers in pre-history to early Euro­pean settlers. Exploration by geologist Reg…

Are deep closed-loop geothermal systems doomed?

Henk Kombrink
“Claims of universal geographical scalability of Closed Loop Geothermal Systems (CLGS) in power generation at competi­tive prices are not supported by simulation results,” is what the authors conclude in a…

Extract and re-inject water, from the same well

Henk Kombrink
The city of Munich is blessed with a very permeable succes­sion of Quaternary sediments that enables a high and con­sistent supply of groundwater flow. As such, there is great potential…

Building a reservoir model for a geothermal field

Henk Kombrink
The first well in the Ohaaki geothermal field in New Zealand was drilled in 1965. However, it lasted until 1989 before power production really started, even though large-scale testing of…

The “nugget effect” in geothermal exploration

Henk Kombrink
“We see permeabilities of 10 Darcy and above 15 % porosity, easily,” says Alan Bischoff. Alan is associate pro­fessor of geoenergy at the University of Turku in Finland. In that…