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The T_m/T_s index as the ratio of two isomeric peaks of C_(27)H_(46) trinorhopane in the m/e 191fragmentogram is one of the important molecular parameters for petroleum geochemistry,whichhas found wide application in identifying the degree of maturation of organic matter in China.It has been observed that the T_m/T_s index not only depends on the burial depth and tempera-ture with respect to terrestrial crude oils and source rocks (i.e.,it decreases with increasing bu-rial depth and temperature),but also on the type of organic matter and sedimentary facies,Sothe application of the index indicative of maturation of organic matter is conditional.
The T_m / T_s index as the ratio of two isomeric peaks of C_ (27) H_ (46) trinorhopane in the m / e 191 fragment is one of the important molecular parameters for petroleum geochemistry, which has found wide application in identifying the degree of maturation of Organic matter in China. It has been observed that the T_m / T_s index not only depends on the burial depth and tempera-ture with respect to terrestrial crude oils and source rocks (ie, it decreases with increasing bu-rial depth and temperature) but also on the type of organic matter and sedimentary facies, Sothe application of the index indicative of maturation of organic matter is conditional.