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Laboratory Studies

Porcelanite and chert originate from marine diatoms as diatomite, which undergoes diagenetic conversion of amorphous opal (opal-A) to cristobalite and tridymite (opal-CT) and finally quartz.
The phase transitions from opal-A to opal-CT to quartz plays an important role in hydrocarbon trapping in regions with siliceous deposits, particularly where structural traps are absent.
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