Kudryavtsev introduced a number of other relevant observations into the argument about the theory of abiogenic petroleum origin.
Columns of flames have been seen during the eruptions of some volcanoes, sometimes reaching 500 meters in height, such as during the eruption of Mount Marapi in Sumatra in 1932. (There have been several other instances subsequently.)
The eruptions of mud-volcanoes have liberated such large quantities of methane that even the most prolific gasfield underneath should have been exhausted long ago.
The quantities of mud deposited in some cases would have required eruptions of much more gas than is known in any gasfield anywhere.
The water in mud volcanoes in some instances carries such substances as iodine, bromine and boron that could not have been derived from local sediments, and that exceed the concentrations in seawater one hundredfold.
Mud volcanoes are often associated with lava volcanoes, and the typical relationship is that where they are close, the mud volcanoes emit incombustible gases, while the ones further away emit methane.
He knew of the occurrence of oil in basement rocks of the Kola Peninsula, and of the surface seeps of oil in the Siljan Ring formation of central Sweden.
He noted as mentioned above that the enormous quantities of hydrocarbons in the Athabasca tar sands in Canada would have required vast amounts of source rocks for their generation in the conventional discussion, when in fact no source rocks have been found.