川中-川东南地区震旦系-下古生界沥青来源及成烃演化

据实测实验数据分析了川中及川东南地区典型构造上勘探井震旦系—下古生界泥岩及沥青样品的生物标志化合物的特征,证实源岩的沉积环境主要为具有一定盐度的还原环境,生物多来自于低等水生生物的菌藻类。川中震旦系—下古生界和川东南震旦系储层沥青主要来自寒武系泥岩;川东南下古生界储层沥青则为寒武系和志留系的混合来源。利用Karweil方法分析了川中地区高科1井寒武系烃源岩的成烃史;采用磷灰石裂变径迹技术与Easy%Ro模型联合模拟恢复了川东南地区丁山1井的生烃史;对比分析表明,川东南寒武系烃源岩成熟时间、主生油及主生气期均早于川中寒武系烃源岩。

The Source of Sinian and Lower-Palaeozoic Bitumen and Hydrocarbon Evolution in the Middle and Southeast of the Sichuan Basin

The author analyzed characteristics of the biological marker of Sinian and Lower-Palaeozoic mudstone and bitumen in the typical structural belt in the middle and southeast of the Sichuan basin.It is suggested that sedimentary environment of source rock was mainly reduction one with a certain extent of salinity,and organism was mainly sclerotia-algal from lower-class aquatic Organism.The reservoir Sinian-Lower Palaeozoic bitumen in the middle of Sichuan basin is Cambrian mudstone and reservoir bitumen in the southeast mixing source of Cambrian and Silurian mudstone.The paper analyzed the hydrocarbon-generation history of well Gaoke 1 using Karweil method,and modeled the hydrocarbon-generation history of well Dingshan 1 taking the method of apatite fission track and Easy%Ro.The comparative analysis indicated that maturity of Cambrian source rocks and oil-generation and gas-generation in the southeast Sichuan basin is earlier than the Middle-Sinian hydrocarbon source in the central part of the Sichuan basin.