Partial dissolution of carbonate rock grains during reactive CO2-saturated brine injection under reservoir conditions
![Partial dissolution of carbonate rock grains during reactive CO2-saturated brine injection under reservoir conditions](https://usg.fei-software-center.com/backoffice/wp-content/uploads/2018/09/1-s2.0-S0309170818305311-gr3.jpg)
Our novel procedure of injecting oil after reactive transport has revealed previously unidentified (ghost) regions of partially-dissolved grains of carbonate rock. X-ray micro-tomography and FIB-SEM techniques were used to identify and resolve these ghost regions in three-dimensions at the nm- to µm-scale. Considering the solid part of the ghost regions as macro (bulk) pore space can result in the overestimation of porosity and permeability predicted from segmented X-ray tomographic images.