Abstract
Based on coinjection and/or comparison with synthesized standards, a novel C_(18-23) tricy- clic terpane series with a base peak at m/z 123 on their mass spectra have been detected and conclusively identified from the basal sandstone in the Upper Proterozoic Xiamaling For- mation, eastern Yanshan region, North China, and their molecular structure has been deter- mined as 13α(n- alkyl)- tricyclic terpanes. Dealing with the biomarker assemblage of the reser- voir bitumen, the source input of their organic material, two kinds of degradation effects and origin of the novel tricyclic terpane series are approached herein.
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