We have appreciated the recent extensive reviews by Cordell (1972, 1973) on petroleum generation and migration and followed with interest the subsequent discussion (Philippi, 1974; Cordell, 1974). On the basis mainly of our experience with Australian oils and source rocks, we would like to make the following comments.

If migration of organic acids did occur, the reservoir presumably would be at a shallower depth and lower temperature. A considerable period then would be required before decarboxylation could proceed at temperatures which must be higher than the maximum previously achieved in the source rock. On this...

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