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Chalk rock, saturated with brine and oil
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| Chalk rock, saturated with brine and oil.
Dark gray bubbles = dried oil droplets in brine-filled cracks |
Chalk rock, saturated with brine and oil.
X-ray analysis of fluids,
overlay picture: - green = oxygen, - red = carbon |
Images courtesy of Ola Risvik, University of Stavanger, Norway.

