Oilfield Glossary

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Note: Definitions provided on this website are for reference purposes only. Engineers and professionals should independently confirm all information using industry standards.

Gas chromatograph

A gas chromatograph is an analytical instrument used by mud loggers to separate and analyze the chemical composition of gas extracted from the drilling mud. It identifies specific hydrocarbon components (C1-Methane through C5-Pentane).

The ratio of these gases (gas ratios) helps geologists identify the type of fluid in the reservoir (oil vs. gas vs. water) and detect oil-water contacts.

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