烃源岩热演化程度是判断一个盆地是否具备生油能力的重要指标 ,因此烃源岩的热成熟度是石油工作者研究的重点。二苯并噻吩由于具有对称的分子结构 ,因此具有很宽的热成熟范围 ,而且由于其在各类烃源岩中的广泛分布 ,如果二苯并噻吩系列化合物随热演化变化而发生规律性的变化 ,则其不失为一个良好的成熟度指标。通过对巴彦浩特盆地石炭系的系统取样和分析 ,发现 4,6 -二甲基二苯并噻吩、2 ,4-二甲基二苯并噻吩、1,4-二甲基二苯并噻吩随石炭系埋深增加而规律性变化。初步的研究表明 ,二苯并噻吩系列化合物随热成熟度增高而变化的规律性很强 ,并且与镜质体反射率间存在着良好的线性关系。因此 ,二苯并噻吩系列化合物可能在烃源岩成熟度研究中有着很好的应用前景 The degree of thermal evolution of source rocks is an important index to judge whether a basin has oil generation ability. Therefore, the thermal maturity of source rocks is the focus of petroleum research. Dibenzothiophene has a wide range of thermal maturity due to its symmetrical molecular structure. Due to its wide distribution in various source rocks, if the dibenzothiophene series compounds change regularly with thermal evolution Change, it is a good maturity index. Through systematic sampling and analysis of Carboniferous in Bayanhot Basin, it was found that 4,6 - dimethyldibenzothiophene, 2,4 - dimethyldibenzothiophene, 1,4 - dimethyldibenzothiophene With the increase of burial depth of Carboniferous, the regularity changes. Preliminary studies have shown that the dibenzothiophene series of compounds with high thermal maturity and regularity of the law changes, and the vitrinite reflectance has a good linear relationship. Therefore, dibenzothiophene compounds may have a good application prospect in the study of maturity of source rocks