Abstract
Based on geological results, Longtangou bituminous sandstone is a fossil oil pool formed and subsequently altered by gabbro-diabase sills during the Precambrian time. GC and GA/MS analyses have been performed for the aliphatic and aromatic fractions of the bituminous sandstone, in which steranes and hopanes are totally absent; a novel tricyclic terpane series (C 18–C 23) with a 13 α( n-alkyl)-configuration side-chain has been conclusively identified, and another regular tricyclic terpane series as well as certain sesqui- and diterpenoid compounds were detected as well. These results indicate some significant characteristics of specific source input, sedimentary environment and oil maturation for the Precambrian organic matter and hydrocarbon.
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