J. D. Saxby and M. Shibaoka have taken issue with some of the evidence utilized in the oil origin and primary migration models proposed or discussed in my recent papers (Cordell, 1972, 1973, 1974). They have raised three main problems which are assessed separately in the following paragraphs.

1. Significance of variations in ratio of liquid hydrocarbons to noncarbonate carbon.—The writer fully agrees with Saxby and Shibaoka that a decrease or constancy of this ratio with increasing depth in source-type beds does not necessarily mean that primary migration has taken place. In fact, as a...

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