CO2 STORAGE POTENTIAL MODELLING EXAMPLE FROM DVP

Abstract

Anthropogenic CO2 emissions can be sequestered in Flood basalts which act as suitable host mediums for long lasting storage, employing mineralization trapping. The silicate minerals react with CO2-charged fluids as evident from natural systems. Laboratory experiments conducted result in producing high rate of reactivity with the basalts. Deccan basalts with large voluminous extent of 500000 km3 and highly porous and permeable vesicular flow tops, exhibit large storage capacity. Most of the Western Deccan basalt in Maharashtra is found to deliver suitable storage space at depths typical for CO-- sequestration. Based on various experiments conducted at ambient pressure, temperature conditions (for depths ranging from 500m to 800m), the amount of uptake by mass at 50°C range from .03 to .75% for tholeiite resulting in a minimum storage of 713Mt CO2 under I .9E+l I rn2 area considered in the state of Maharashtra (at 10% efficiency assumed). The interbedded sediments and the basal rocks prove to be of high importance in forestalling the migration of CO2 due to their low-permeability. The occurrence of most of the crystalline rocks of the Deccan at the surface deliver less overall storage volume below, but still significant for sequestering considerable amounts.