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The global energy sector from a subsurface perspective

Geothermal

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…

An exciting drilling campaign in exciting geology

Henk Kombrink
Did EBN set a trend? That’s to be seen, but the four-well geothermal drilling campaign the Croatian Hydrocarbon Agency recently em­barked on to prove the potential of an equal number…

Bacterial life is everywhere in the subsurface

Henk Kombrink
Elsemiek Croese. Photography: Elsemiek Croese private archive. “Let’s put it this way,” says Elsemiek Croese from Microbial Analysis, “one of the key ingredients of life is water. In that light,…