Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1016/j.enggeo.2013.02.005
Title (Primary) Coupled multiphase flow and elasto-plastic modelling of in-situ gas injection experiments in saturated claystone (Mont Terri Rock Laboratory)
Author Xu, W.J.; Shao, H.; Hesser, J.; Wang, W. ORCID logo ; Schuster, K.; Kolditz, O. ORCID logo
Source Titel Engineering Geology
Year 2013
Department ENVINF
Volume 157
Page From 55
Page To 68
Language englisch
Keywords Numerical code OGS; Gas migration; Two-phase flow; Elasto-plastic; Opalinus clay; Mont Terri Rock Laboratory
UFZ wide themes RU5;
Abstract

Understanding gas migration in host rock is one of the most important issues to consider in the final disposal of radioactive waste in deep geological formations. In order to investigate gas transport in water-saturated argillaceous rock, constant gas pressure injection tests on the samples from the Mont Terri Rock Laboratory (Switzerland), as well as pulse injection tests with a stepwise increasing of gas pressure, were carried out. During gas migration, desaturation and hydraulic mechanical interaction can be observed. To simulate gas migration in water-saturated porous media, a coupled multiphase flow and mechanical method within the FEM code family OpenGeoSys (OGS) was developed including the van Genuchten function for the relationship between capillary pressure and water saturation, the approach of Mualem for the relative permeability of both gas and water phases, and an elasto-plastic deformation model. Two approaches were applied, taking into consideration the permeability change by pore gas pressure and by deformation, respectively. Both permeability approaches are based on experimental observations and allow for the significant increase in permeability when gas pressure exceeds the minimal stress. The material parameters for the multiphase model are determined using the measured data from laboratory experiments under well-defined test conditions. With the calibrated model parameters, the in-situ experiment was simulated. Good agreement between the numerical results and the experimental data is achieved.


Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=13783
Xu, W.J., Shao, H., Hesser, J., Wang, W., Schuster, K., Kolditz, O. (2013):
Coupled multiphase flow and elasto-plastic modelling of in-situ gas injection experiments in saturated claystone (Mont Terri Rock Laboratory)
Eng. Geol. 157 , 55 - 68 10.1016/j.enggeo.2013.02.005