Geologic carbon storage (GCS) is a crucial part of a proposed mitigation strategy to reduce the anthropogenic CO2 emissions to the atmosphere. During this process, CO2 is injected as super critical carbon dioxide (SC-CO2) in confined deep subsurface storage units, such as saline aquifers and depleted oil reservoirs. The deposition of vast amounts of CO2 in subsurface geologic formations may ult...

In his reports on the regional hydrogeology of the central Great Plains, in particular southeastern Colorado and southwestern and central Kansas, Darton considered the Dakota aquifer to be a classic example of an artesian system. Computer simulations of the flow system in this study, however, suggest that the Dakota is not a regional artesian aquifer in the classic sense. Sensitivity analysis o...

Here we examine the consequences of uncertainty with respect to geological parameters, using large-scale 2D models. We also investigate ways to reduce prediction uncertainty, either by showing how a parameter’s influence is negligible for a given project design, or by showing for which parameters additional data will significantly increase the quality of prediction. TOUGH2/ECO2N is used to simu...

When field data are limited, stratigraphic models are used instead of detailed, fully heterogeneous models (FHM) to represent deep saline aquifers in numerical simulations of CO2 storage. This study evaluates parameter sensitivity and prediction uncertainty of three stratigraphic models of decreasing complexity (i.e., facies, layered, formation) against that of a FHM. For select simulation outc...

Geologic heterogeneity is one of the important factors controlling migration and distribution nonaqueous phase liquids in subsurface. Heterogeneity, such as fractures, complicates effectiveness environmental remediation, uncharacterized aquifer causes significant uncertainties removal liquids. Foaming an injection gas effective method to alleviate challenges accessing heterogeneous media during...

Underground hydrogen storage can store grid-scale energy for balancing both short-term and long-term inter-seasonal supply demand. However, there is no numerical simulator which dedicated to the design optimisation of such technology at grid scale. This study develops novel simulation capabilities GPSFLOW (General Purpose Subsurface Flow Simulator) modelling gas mixture (e.g., H2–CO2–CH4–N2) in...

Geological, geophysical and hydrological surveys were performed in an area between Lecce to the North and Otranto to the South on the Lower Adriatic coast of Italy in order to verify the “state of health” of the ground water in the deep aquifer, which is characterised by Mesozoic carbonatic formations and is permeable due to fracturing and karstic phenomena. This area was chosen because it is h...