... and methods sThe following core analysis techniques have been applied and reviewed in order to solve the current problem: X-ray diffraction (XRD), thin section description, core microtomography, mercury porosimetry. Results Composition of argillous gaize reveals severalsections, which are distinctly different in the amount of various silica forms - quartz and OCT (opal, cristobalite, and tridymite). On the average, NB1 layer contains 22% of OCT and 44% of quartz, whereas NB2 shows 0.1% and 66% respectively....

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