CO2 Reaction-Diffusion Experiments in Shales and Carbonates
نویسندگان
چکیده
The evaluation of caprock integrity and reservoir efficiency is critical for safe CO2 geological storage management. It therefore important to investigate geochemical reactions between CO2-rich fluids host rocks their contribution in retaining at depth. This study deals with diffusive reaction experiments on shales carbonate samples cored from an offshore structure the Malaysian basin, a potential target CO2-enhanced gas recovery. aim evaluate front velocity typical shaly mineral response reservoir. Rock were characterized terms texture, chemistry, mineralogy by X-ray diffraction, electron microscopy (SEM), microanalysis (EDS), infrared spectroscopy (FT-IR), rock geochemistry (XRF), mercury injection capillary permeability (MICP). Performed analyses show mineralogical alteration induced as it penetrated into samples. Carbonate dissolution weathering pyrite form secondary carbonates belonging siderite-ankerite series observed along two fronts. Estimated diffusion coefficients are orders magnitude lower than CO2(aq) molecular pure water half order diffusivity computed unaltered sample, highlighting effect gas–water–rock diffusivities carbonates. Results obtained this provide insight regarding transport represent further discussion point coefficients.
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ژورنال
عنوان ژورنال: Minerals
سال: 2022
ISSN: ['2075-163X']
DOI: https://doi.org/10.3390/min13010056