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Digital Rock Physics: Oscillatory behavior of residual fluid in porous rocks

56 hours measurement time granted by the Paul Scherrer Institute, Switzerland

Principal Investigator: Marcel Frehner

Co-applicants: Holger Steeb, Claudio Madonna, Florian C. Fusseis, Erik H. Saenger, Jean-Pierre Burg

Additional experiment participants: Beatriz Quintal, Patrick Kurzeja, Nicola Tisato, Pei-Ju Rita Shih, Shankar Submaraniyan

Project duration: October 10-12 2013

Project homepage: Residual saturation

Short description

The TOMCAT-beamline of the Swiss Light Source (SLS) at the Paul Scherrer Institute (Villingen, Switzerland) is a high-energy high-precision X-ray source. TOMCAT stands for tomographic microscopy and coherent radiology experiments and it allows conducting ultra-high-resolution Synchrotron-based X-ray Tomographic Microscopy (SRXTM). To support our research on seismic wave propagation effects and dispersion mechanisms in partially saturated porous and fractured rocks we also use the TOMCAT-facilities.

The main aim of this particular project is to perform drainage and imbibition experiments of porous rocks in the X-ray beam. We use an X-ray transparent pressure cell with two independent fluid inlet/outlet-systems. By pushing one fluid out of the pore space by the second fluid, we are able to observe the two-phase fluid distribution in the different saturation stages. Our special interest thereby is when one fluid cannot be pushed out of the pore space any further and remains in a residual saturation stage.

We will gain new high-precision insight into the fluid distribution of residual saturated porous rocks, which is essential to understand seismic wave propagation phenomena in this special saturation stage.