Abstract
According to the relative internal energy difference of various sterane and terpane stereoisomers, the order of thermodynamic stability is as follows: 13..beta.., 17..cap alpha.. > 14..beta.., 17..beta.. > 13..cap alpha.., 17..beta.. > 14..cap alpha.., 17..cap alpha..; 5..cap alpha.. > 5..beta..; 20S greater than or equal to 20R; 17..cap alpha.., 21..beta.. > 17..beta.., 21..cap alpha.. > 17..beta.., 21..beta..; 18..cap alpha..-C27 > 17..cap alpha.. > 17..beta..; 22S < 22R. The relative stability of various sterane and terpane stereoisomers can provide a sound basis for studying oil and rock maturity using biological markers. The configurational transformation of sterane and terpane in several oils has been studied in cores from the Liaohe, China, area. The results show that the threshold depth of oil generation in lower Tertiary source rocks is 2350 m.
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