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The Centre for Environmental Scanning Electron Microscopy (CESEM) regularly analyses produced water filter papers for the oil industry, for the purpose of scale analysis.
The example above is a magnification of calcium sulphate crystals, from material provided by Nalco Champion, recovered from a produced water sampled from a North Sea production well under seawater flooding.
The image was entered to FEI’s 2014 micrograph competition, and won one of the prizes for December 2014.