A novel computational framework for thermal‐hydrological‐mechanical‐chemical processes of CO 2 geological sequestration into a layered saline aquifer and a naturally fractured enhanced geothermal system

Ronglei Zhang, Yi Xiong, Philip H. Winterfeld, Xiaolong Yin and Yu‐Shu Wu

Greenhouse Gases: Science and Technology, 2016, vol. 6, issue 3, 370-400

Abstract: CO 2 geo‐sequestration into saline aquifers and an enhanced geothermal system (EGS) are two of the most effective solutions to reduce CO 2 emissions into the atmosphere. The significance of thermal‐hydrological‐mechanical‐chemical (THMC) interactions is well identified in these two processes: fluid and heat flow, solute transport within a three‐phase mixture; stresses and displacements related to geomechanical effects; non‐isothermal effects on fluid properties and reaction processes; and equilibrium and kinetics of fluid‐rock and gas‐rock chemical interactions. In this paper, a novel numerical model is developed to describe the THMC processes mathematically. One mean stress formulation, which is simplified from the geomechanical equations with full stress tensor, is employed to solve mean stresses and displacements. Chemical equilibrium and kinetics are considered to quantitatively simulate geochemical reaction associated with solute transport. A sequentially coupled computational framework is proposed and used to solve reactive transport of water, gas components, and chemical species in subsurface formation with geomechanics. It is designed to keep a generalized computational structure for different THMC processes. A practical case with complex chemical compositions is presented to analyze the THMC processes quantitatively on the coupled effects of geochemistry and geomechanics during CO 2 geo‐sequestration. In addition, a practical EGS case is presented to address the mutual effects of each THMC process quantitatively, especially the mutual effects of stress and chemical reaction. Heat transfer affects mean stress and geochemical reactions; mean stress impacts the solute transport and successive chemical reactions; and geochemical reactions are shown to have significant impact on the mean stress, pressure, or temperature.

Date: 2016
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

Downloads: (external link)
http://hdl.handle.net/10.1002/ghg.1571

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:wly:greenh:v:6:y:2016:i:3:p:370-400

Access Statistics for this article

More articles in Greenhouse Gases: Science and Technology from Blackwell Publishing
Bibliographic data for series maintained by Wiley Content Delivery ().