To the Editorial Office of Petroleum Geology & Experiment,
We hereby certify that the manuscript titled "________________________________________" submitted by _________________________________________________ (author names) has been reviewed by our institution. The content of the manuscript does not involve any state secrets or any information that our institution requires to be kept confidential. We approve its submission to your journal.
Institution Name: ________________________ (Official Stamp)
Date: __________ (YYYY) __________ (MM) __________ (DD)
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