scholarly journals Up-Scaling Geochemical Reaction Rates for Carbon Dioxide (CO2) in Deep Saline Aquifers

2013 ◽  
Author(s):  
Catherine A Peters
Keyword(s):  
Carbon Dioxide ◽  
Reaction Rates ◽  
Saline Aquifers ◽  
Deep Saline Aquifers ◽  
Carbon Dioxide Co2 ◽  
Geochemical Reaction ◽  
Up Scaling

scholarly journals Constructive optimization of electrode locations for target-focused resistivity monitoring

Geophysics ◽  
2015 ◽  
Vol 80 (2) ◽  
pp. E29-E40 ◽  
Author(s):  
Florian M. Wagner ◽  
Thomas Günther ◽  
Cornelia Schmidt-Hattenberger ◽  
Hansruedi Maurer
Keyword(s):  
Carbon Dioxide ◽  
Experimental Design ◽  
Formal Model ◽  
Quantitative Imaging ◽  
Saline Aquifers ◽  
Model Resolution ◽  
Resistivity Tomography ◽  
Imaging Capability ◽  
Deep Saline Aquifers ◽  
Cost Efficient

Crosshole resistivity tomography has received consideration as a tool for quantitative imaging of carbon dioxide stored in deep saline aquifers. With regard to the monitoring responsibility of site operators and the substantial expenses associated with permanent downhole installations, optimized experimental design gains particular importance. Based on an iterative appraisal of the formal model resolution matrix, we developed a method to estimate optimum electrode locations along the borehole trajectories with the objective to maximize the imaging capability within a prescribed target horizon. For the presented crosshole case, these layouts were found to be symmetric, exhibiting refined electrode spacings within the target horizon. Our results revealed that a sparse but well conceived set of electrodes can provide a large part of the information content offered by comparably dense electrode distributions. In addition, the optimized layout outperformed equidistant setups with the same number of electrodes because its resolution was focused on the monitoring target. The optimized electrode layouts presented provided a powerful and cost-efficient opportunity to complement permanent installations, particularly at, but not limited to, future [Formula: see text] storage sites. Although preliminarily developed to support the design of crosshole resistivity layouts, our approach is directly applicable to other survey geometries including surface and surface-to-hole acquisitions.

CO2-Brine Displacement in Geological CO2 Sequestration: Microfluidic Flow Model Study

2015 ◽  
Vol 752-753 ◽  
pp. 1210-1213
Author(s):  
Shuang Cindy Cao ◽  
Jong Won Jung ◽  
Jong Wan Hu
Keyword(s):  
Carbon Dioxide ◽  
Porous Media ◽  
Ionic Strength ◽  
Flow Model ◽  
Saline Aquifers ◽  
Flow Through Porous Media ◽  
Model Study ◽  
Microfluidic Flow ◽  
Flow Through ◽  
Deep Saline Aquifers

Geological CO2 sequestration is a promising method to reduce atmospheric CO2. Deep saline aquifers are one of the most important sites due to their capacity for CO2 storage. Thus, a better understanding of immiscible brine-CO2 mobility and their saturations including invading patterns in deep saline aquifers as CO2 storage sites is required. Microfluidic model provides the opportunity to discover unrecognized processes and to explore existing theories in fluid flow through porous media. In this study, the microfluidic model is used to explore the effects of both the supercritical carbon dioxide (scCO2) injecting velocity and ionic strength in saline aquifers on scCO2 invading patterns in geological CO2 sequestration. The results show that scCO2-brine displacement ratio increases with (1) increased scCO2 injecting velocity up to 40 μL/min, and (2) decreased ionic strength in the range of 1M~5M NaCl.

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