Field Observations
Proponents sometimes cite occurrences of abiotic petroleum in commercial amounts, in the oil wells in offshore Vietnam, Eugene Island block 330 oil field, and the Dnieper-Donets Basin, but its origin can be explained with biotic origin. Modern geogologists think that commercially profitable deposits of abiotic petroleum could be found, but no current deposit has convincing evidence that it originated from abiotic sources.
The Soviet school saw evidence of their hypothesis in the fact that some oil reservoirs exist in non-sedimentary rocks such as granite, metamorphic or porous volcanic rocks. However, critics note that non-sedimentary rocks served as reservoirs for biologically originated oil expelled from nearby sedimentary source rock through common migration or re-migration mechanisms.
The following observations have been commonly been used to argue for the abiogenic hypothesis, however all the observations of actual petroleum can also be fully explained by biotic origin.
Read more about this topic: Abiogenic Petroleum Origin
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