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Figure 3 | Geochemical Transactions

Figure 3

From: Experimental Study of Cement - Sandstone/Shale - Brine - CO2Interactions

Figure 3

ESEM images of reacted sandstone. (A) Unreacted sandstone consisted of quartz, carbonate cement, and chlorite which lines the pore spaces. Reaction of sandstone with CO2-rich brine produced (B) aluminum hydroxide or aluminosilicate reaction products deposited on the sandstone surface and (C-D) coagulated Si-rich and Fe-rich precipitates in the brine. Reaction of the sandstone with cement and CO2-rich brine produced (E) Fe - bearing CaCO3 precipitates.

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