【摘要】 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更多还原

【Abstract】 Based on the studies of the graptolite reflectance of Ordovician and Silurian in Tarim Basin,Ordos,Jiangsu,and together with the synthesis of the organic geochemistry indicators,the authors establish correlation equation of graptolite maximum,random reflectance and the equivalent vitrinite reflectance of the same strata which obtained from results of organic geochemistry analysis.\;The maximum reflectance of graptolite was a better index than the random reflectance to indicate the source rock maturation in Ordovician and Silurian.\;The reflectance of graptolite has a rapidly increasing rate at 4.27%—5% of GR 0 max compared to the reflectance of equivalent vitrinite.This feature shows that the process of the thermal maturation of graptolite organism has its own unique features:the thermal process of graptolite organism is similar to that of vitrinite just before 4% of its reflectance.\;Because the graptolite fuseller tissue is a regular structure,which decreases the effects of the pressure on the graptolite organism,the temperature becomes the major factor to control the graptolite organic maturation.更多还原