塔里木盆地塔东2井原油成因分析

Origin of Oils from Well Tadong 2 in Tarim Basin

塔东2井原油为高密度、粘度大,δ13C相对较重的稠油。原油中轻烃、环状萜类、甾烷及芳香甾烷组成与分布均具有海相原油的特点。具有时代意义生物标志物的油源对比结果表明,该原油来源于寒武系烃源岩,具有自生自储特点。高反射率热解沥青的存在、芳烃馏分中高含量的多元稠环芳烃及正构烷烃碳同位素相对较重的特点,表明原油在成藏后经历了短期高温热事件的影响。

Oils from Well Tadong2, Tarim Basin, characteristic of high density, high viscosity and heavy carbon isotopic composition, are marine oils due to compositional features of light hydrocarbons, cyclicterpanes, steranes and triaromatic steranes. It can be seen that oils from Well Tadong2,Tarim Basin, are derived from Cambrian source rocks based on age-specific biomarker correlation studies. Recent oil compositional characteristics are probably related with the influence of high temperature geologic thermal event evidenced by pyrobitumen within reservoirs, PAH in aromatic fractions and carbon isotopic composition of alkanes