中文摘要：

利用定性与定量分析手段，研究了川东北地区各类海相烃源岩中的单质硫及其地球化学特征。定性分析表明，该区海相烃源岩中的单质硫具有八硫环状结构和六硫状环结构两种晶体构型，由S8和S6两种同素异形体组成，其中S8具有相对较高的丰度。定量分析表明，该区海相烃源岩中的单质硫含量为0．91×10^-5～375．88×10^-6，具有很宽的分布范围，并且随着烃源岩分布区域、地层时代以及岩性的不同而发生明显变化，表现出强烈的非均质性分布特征。该区海相烃源岩中单质硫含量与有机碳含量之间存在正相关关系，说明单质硫主要发育在富有机质沉积的层段中。通过单质硫含量与总硫含量对比分析，间接证明了川东北地区各类海相烃源岩中赋存有丰富的有机含硫化合物。

英文摘要：

By means of the qualitative and quantitative analysis,the monatomic sulfur and its geochemical characteristics from different kinds of the marine source rocks in Northeast Sichuan Basin were studied. The qualitative analysis results indicate that the monatomic sulfur from the marine source rocks are composed of S6 and S8, which belong to the allotrope sulfur with circular molecule structure,and of the 2 types,the S8 is generally richer than S6 in studied samples. The monatomic sulfur contents of the marine source rocks have very wide distribution interval ranging from 0.91×10^-6 to 375.88 ×10^-6 （0. 001 kg/t - 0. 376 kg/t）. Furthermore, samples collected from different region, different formation and different lithology are of obvious differences indicating that the distribution of the monatomie sulfur possesses very stronger heterogeneity for the marine source rocks in the Northeast Sichuan Basin. The positive correlativity between the monatomic sulfur contents and organic carbon contents from the marine source rocks indicates that the monatomic sulfur mainly develop in the layers rich in sedimentary organic matter. According to comparative analysis of the contents of the monatomic sulfur and total sulfur,rich organic sulfides occur in different kinds of the marine source rocks in the Northeast Sichuan Basin.