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SUMMARY:CO2 Sequestration: Results\, challenges and visions
DTSTART:20110524T091500
DTSTAMP:20260407T002430Z
UID:af50fe067ac206498da54dedac812a7d48b343940108e70f6708e643
CATEGORIES:Conferences - Seminars
DESCRIPTION:Philipp Blum\, Assistant Professor\, Karlsruhe Institute of Te
 chnology\, D\nVarious trapping mechanisms exist to perform a long-term sto
 rage of CO2 in deep\ngeological formations such as fractured saline aquife
 rs. Hence\, the understanding of these small- and large-scale processes su
 ch as diffusion and regional multi-phase flow in fractured rocks is crucia
 l for a secure and lasting storage of CO2. Using laboratory through-diffus
 ion experiments it was possible to determine effective diffusion coefficie
 nts for sandstone samples ranging between 1.8 ~ 10-7 and 5.6 ~ 10-6 cm
 2/s mainly depending on porosity. Thus\, it could be demonstrated that the
  Archiefs Law is also applicable for diffusion of free aqueous CO2 in sa
 ndstones. Furthermore\, geochemical changes in pore water chemistry and ge
 ometry in reservoir rocks due to CO2 injection was studied using two diffe
 rent flow through autoclave systems. Total reflection X-ray fluorescence (
 TXRF)\, inductively coupled plasma optical emission spectrometry (ICP-OES)
  and isotope ratio mass spectrometer (CF-IRMS) were used for the fluid ana
 lysis. Laboratory studies using the Bentheimer Sandstone\, which is mainly
  composed of quartz and feldspar\, showed significant dissolution of felds
 par\, whereas quartz dissolution was less pronounced due to slow reaction 
 kinetics. Additional laboratory and field studies with stable isotopes (ƒ
 Â13C and ƒÂ18O) indicate that ƒÂ13C is suitable monitoring parameter 
 for the observation of critical geochemical\nchanges. The field studies we
 re performed at the Ketzin site\, the first on-shore CO2 injection pilot t
 est site in Europe. The preliminary results showed that around 70% of the 
 dissolved inorganic carbon (DIC) is from the CO2 injection and the remaini
 ng 30% orignates from the dissolution of carbonate minerals. Finally\, a m
 ethodology for the upscaling of hydro-mechanical processes in fractured ro
 cks is presented. The results of this large-scale study clearly demonstrat
 e the importance of the spatial properties of discrete fracture networks (
 DFN) and the mechanical properties of reservoir rocks. In addition to the 
 diverse results\, research challenges are highlighted and interdisciplinar
 y\, collaborative\, short- and long-term visions of the research group are
  provided.
LOCATION:ELA 1
STATUS:CONFIRMED
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