晚三叠世末期楚雄盆地云龙凹陷海相沉积的分子地球化学证据

Molecular geochemical evidences of marine deposit in Late Triassic Yunlong Sag, Chuxiong Ravin

在楚雄盆地云龙凹陷山品村和背阴山上三叠统剖面泥质烃源岩中检出较丰富的24-正丙基C_(30)甾烷和4-甲基C_(30)甾烷、“三芴”系列分布以二苯并噻吩绝对占优为特征,除二苯并噻吩外,还检出高含量的苯并萘噻吩系列化合物。这表明在晚三叠世末期,云龙凹陷海相沉积环境是客观存在的。

24-n-properylcholestanes and 4-methyl-24 ethylcholestanes have been identified with relative high abundance in the hydrocarbon source rocks sampled from Shanpineun and Beiyinshan, Upper Triassic sections in the Yunlong Sag, Chuxiong Basin. The distribution of 'three furan' is characterized with absotute dominance of dibenzothiophene. Besides the dibenzothiophene, naphthobenzothiophenes have been detected with high content, suggesting that the marine environment does exist during the end of Late Triassic.