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About 50 formation waters, produced from wells tapping the aquifers of the clastic Pannonian Basin and Mesozoic carbonates, were studied by GC–MS for their content of hexane soluble organic compounds. About half of the waters studied are hotter than 65°C (the regional threshold of thermal gas generation) and always contain a great variety of naturally occurring polycyclic aromatic hydrocarbons (PAH) consisting of aromatic hydrocarbons, heteroaromatics and in some cases phenols. These waters are not known to be connected with oil pools. The most characteristic compound classes of six PAH-rich water samples are discussed here. Mono-, di-, tri- and tetracyclic aromatic and heterocyclic fused aromatic hydrocarbons are present in these waters but in rather varying relative proportion. The absence of phenols in two of these waters, one produced from a carbonate and one from a sandy aquifer, is explained by the absence of terrestrial kerogen and insufficient maturity (R0 |
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