塔东地区下古生界烃源岩热演化及有利生烃区分析

摘要

After a long time’s thermal evolvement, marine sapropelic source rocks in Cambrian-middle Ordovician, mainly type I kerogen,had underwent complicated periods of maturation in a high overmature stage,and generated oil and gas in time history.With researches of predecessors,palaeogeothermal in the Eastern Tarim Basin can be divided into five phases and two zones.Used solid bitumen in the source rocks to measure equivalent vitrinite reflectance and Basin-Mod1-D software,we inversed Ro so as to get the evolution extent of key periods. Meanwhile,thermal evolution types of study area can be divided into three ones By the process remolding.Finally, with the successive gas generation and theory of hydrocarbon getting from kerogen,we draw the line of favorable generation area in the Eastern Tarim Basin.%　　塔东地区寒武系—中下奥陶统烃源岩为海相Ⅰ类腐泥型，其热演化程度很高，基本处在高过成熟阶段，历史过程中有过很大的油气贡献。综合前人研究将本区古地温演化划分为两个大区5个阶段。同时对固体沥青求得等效镜质体反射率，利用镜质体反射率反演及BasinMod软件，来恢复各关键历史时期的成熟度，重塑整个热演化过程，划分出3种成熟演化类型。据干酪根生气理论和“接力生气”来划定塔东地区有利生烃区范围。