Kerogen samples from three recent sediments (Tanner basin, Santa Barbara basin, and Banderas Bay) were heated for 24 hours at temperatures ranging from 150 to 410°C. The volatile, liquid, and solid residue products of thermal alteration were then analyzed. A comparison of the hydrocarbon generating potential indicates greatest liquid product yields from the predominantly marine source organic material of Tanner basin and the smallest yields from the terrestrially originating source material of Banderas Bay. The nature of the chemical changes described (atomic ratios of H/C and N/C, electron spin resonance data, volatiles lost, n-alkanes generated, and odd-even preference ratio) may be useful in constructing source and maturation histories.

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