Скачать или смотреть Geoscience Insights for Developing Superhot Icelandic Geothermal Resources_Bryan Lovell Meeting 2019

Day 2

Speaker: Thomas Driesner

Thomas Driesner is a senior researcher/adjunct professor at the Department of Earth Sciences at ETH Zurich.

His research interests cover numerous facets of the role of hot fluids in the earth's crust: from molecular-scale thermodynamics to crustal-scale fluid flow, and with a particular focus on hydrothermal systems in the context of ore formation and geothermal resources.

Abstract

Geothermal power production is almost exclusively based on natural waters heated by magma bodies that lie at a few km depth. Typical geothermal production temperatures are between 250° and 300°C, from wells drilled to 1 to 2 km. Further increase of water
temperature is limited by the so-called "boiling curve with depth", which strongly steepens at these depths. This constellation limits power output per well to values in the order of 3 to 5 MW.

The magma bodies that heat the water, however, are much hotter, i.e., 750° to even more than 1000°C and very hot water should be expected at greater depths where pressures are in excess of ca. 220 bar and the boiling curve terminates and water becomes "supercritical".

Such considerations gave rise to the Island Deep Drilling Project IDDP (www.iddp.is) to explore if such extremely hot water can indeed be found and utilized