塔中地区典型烃源岩地球化学特征

Geochemical Characteristics of Typical Hydrocarbon Source Rocks in Tazhong Area

应用GC/MS、GC/MS/MS分析技术,剖析了塔中地区寒武系-下奥陶统烃源岩和中-上奥陶统烃源岩2套烃源岩生物标志物组合特征。研究表明:寒武系烃源岩及上奥陶统黑土凹组烃源岩中三环萜烷、四环萜烷、三萜烷类、甾烷等环状烃的化合物浓度均较高,常高出中、上奥陶统烃源岩的数倍乃至数十倍;而链烷烃的化合物丰度基本上相当。除此以外,芳烃化合物中萘、菲系列化合物含量较高,二苯并噻吩含量高于氧芴。

By using the analytical techniques of GC/MS,GC/MS/MS,the characters of composition biomarkers of Cambrian-lower Ordovician and mid-upper Ordovician source rocks were analyzed.Study shows that in Cambrian source rocks and source rocks in upper Ordovician Heituao Formation,the compound concentrations of tricycle terpane,tetracycle terpane,triterpanes,gonane are higher,which is as high as many times or more than several dozen times of mid-upper Ordovician source rocks.While the compound abundance of paraffin is basically the same.The compound contents of naphthalene and luxuriant are higher,the content of dibenzothiophene is higher than that of dibenzofuran.