通过对塔里木盆地、鄂尔多斯、江苏等地区奥陶系、志留系笔石反射率的研究 ,以该地区有机地球化学等综合分析指标为中介 ,分析笔石反射率与等效镜质体反射率之间的对比关系 ,建立笔石反射率对奥陶系、志留系烃源岩成熟度的评价标准。认为笔石最大反射率、随机反射率对奥陶系、志留系烃源岩成熟度有良好的指示作用。发现笔石有机质在热演化过程中 ,由于笔石纺锤层等生物结构的存在 ,使温度成为影响笔石热演化程度的主要因素。笔石的热演化有其自身的特殊性 :在R0max约为 4 %以下时 ,笔石的热演化方式与煤岩镜质体相似 ,并且可能在很晚才进入石墨化作用阶段 Based on the research on the penolith reflectivity of Ordovician and Silurian in the Tarim Basin, Ordos and Jiangsu Provinces and the comprehensive analysis of organic geochemistry in this area, the correlation between penolith reflectivity and equivalent vitrinite reflectance , And established the evaluation criteria for the maturity of Ordovician and Silurian source rocks by the pen-stone reflectivity. It is considered that the maximum reflectance and the random reflectance of penolith have a good indication of maturity of Ordovician and Silurian source rocks. It is found that during the thermal evolution of organic matter in penicillin, the temperature is the main factor that affects the thermal evolution of penolith due to the existence of biological structures such as pen-stone spindle. The thermal evolution of penoliths has its own peculiarities: when R0max is below about 4%, penoliths have a thermal evolution similar to that of coal-rock vitrinites and may enter the stage of graphitization very late