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In the sedimentary basins of Greece are found a lot of hydrocarbon gases that can be distinguished in four categories. Surface gas seeps, gas shows in shallow water-wells, gases in exploration wells and hydrocarbon gas fields. The main gas shows are mainly located inside recent clastic sediments. Hydrocarbon amount varies be­ tween a few ppm and several units percent. Gases are classified in the biogenic gases of Katakolo onshore gas-field, the most surface gas seeps and the gases at shallow depths of exploration wells. Catagenetic are the gases of Katakolo oil field, the Epanomi and South Kavala gas fields, and a lot of gases found in great depths of exploration wells. Metagenetic gases have been identified in Delta Evros and West Thermaikos.

Hydrocarbon gas accumulations in Greece and their origin