Using Geologically Sequestered CO2 to Generate and Store Geothermal Electricity: CO2 Plume Geothermal (CPG)
Abstract
CO2 Plume Geothermal (CPG) is a carbon
neutral renewable electricity generation technology where
geologic CO2 is circulated to the surface to directly generate
power and then is reinjected into the deep subsurface. In
contrast to traditional water geothermal power generation
with an Organic Rankine Cycle (ORC), CPG has fewer
system inefficiencies and benefits from the lower viscosity of
subsurface CO2 which allows power generation at shallower
depths, lower temperatures, and lower reservoir
transmissivities.
In this paper, we modify our existing geothermal
electricity models by: 1) replacing TOUGH2 reservoir
simulations with analytic solutions for a 5-spot reservoir
impedance, and 2) including heat loss to the surrounding rock
using a semi-analytical heat transfer solution. We report the
results of 3050 simulations in a single plot, showing the
power generation of both direct CPG systems and indirect
water geothermal systems for depths between 1 and 7 km and
reservoir transmissivities between 102 and 105 mD-m (10^-13
and 10^-10 m^3). Show more
Permanent link
https://doi.org/10.3929/ethz-b-000444911Publication status
publishedPages / Article No.
Publisher
ETH Zurich, Department of Earth SciencesEvent
Subject
CO2 geothermal; Sedimentary Geothermal; Analytical solution; CCUS; Enhanced Geothermal System (EGS); electric power generationOrganisational unit
01657 - SR Erd- und Klimawissenschaften02330 - Dep. Erd- und Planetenwissenschaften / Dep. of Earth and Planetary Sciences
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Has part: https://youtu.be/_Y392zWrm-U
Notes
Due to the Coronavirus (COVID-19) the conference was conducted virtually.More
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