Investigations of Structural and Residual Trapping Phenomena during CO2 Sequestration in Deccan Volcanic Province of the Saurashtra Region, Gujarat

Abstract

This work aims to study the structural and residual trapping mechanisms on the Deccan traps topography to elucidate the possible implementation of CO2 geological sequestration. This study provides an insight into a selection of stairsteps landscape from Deccan traps in the Saurashtra region, Gujarat, India. Various parameters affect the efficiency of the structural and residual trapping mechanisms. Thus, the parametric study is conducted on the modeled synthetic geological domain by considering the suitable injection points for varying injection rates and petrophysical properties. The outcomes of this study will provide insights into the dependencies of structural and residual trapping on the Deccan traps surface topography and injection rates. It can also establish a protocol for selecting the optimal injection points with the desired injection rate for the safe and efficient implementation of CO2 sequestration. The simulation results of this study have shown the dependencies of structural and residual trapping on the geological domain parameters.

The Magmatic Architecture of Continental Flood Basalts: 2. A New Conceptual Model

“…Thus, we anticipate that the peak passive degassing is toward the end of stage 1 coincident with increasing surface eruptions. In addition, the increased presence of surface basaltic lava flows in Stage 2 may sequester degassed Deccan CO 2 instead of atmospheric emission (Clark et al., 2020; A. Kumar & Shrivastava, 2020; Punnam et al., 2021; Schwartz, 2020; Snæbjörnsdóttir et al., 2018). This physical mechanism (suggested in Sprain et al., 2019 and Nava et al., 2021) thus provides a natural explanation for the observed pre‐K‐Pg global warming observed in a various marine and terrestrial paleo‐proxy records (Hull et al., 2020) which is co‐incident with the eruption of the Kalsubai sub‐group (Schoene et al., 2019; Sprain et al., 2019).…”

Influence of Caprock Morphology on Solubility Trapping during CO2 Geological Sequestration

“…The previous study on the influences of geological folds has shown their impacts on the primary trapping mechanisms and sweeping efficiency of CO 2 plume for different ranges of perturbed subsurface morphology [42]. The existence of geological structures like anticline and syncline can certainly control the CO 2 migration, lateral spreading, and safe storage of CO 2 in the domain [12]. Figure 1 gives a glimpse and schematic explanation of the simulation analysis carried out in the current research study.…”

“…The structural and residual trapping is calculated using the equation illustrated in Table 1 Eq. ( 11)- (12). The movable plume is the remaining quantity of CO 2 after the structural and residual trapping.…”

“…After the injection, the CO 2 trapped in porous structures leaves residuals during its movement. This part of injected CO 2 co-exists with water, classified as the residual trapping mechanism [11][12][13]. During upward migration of injected CO 2 from the injection point, some quantity of CO 2 will get trapped in the migration pathway due to the higher entry capillary pressure of the pore.…”

“…Lee et al's [39] research described the influence of anticline structure on the selection of injection rate for the CO 2 sequestration. With a higher injection rate, the CO 2 plume is directed towards the anticline structure; during this process, some CO 2 gets immobilized in the migration pathway towards the anticline at a lower injection rate [12]. The flow dynamics of CO 2 plume in the migration pathway and contact area of CO 2 plume with water are highly dependent on the domain heterogeneity, which further influences the residual and solubility trapping percentage [39].…”