周口盆地谭庄-沈丘凹陷下白垩统剥蚀厚度恢复方法研究

Research on Methods of Thickness Restoration of the Denuded Lower Cretaceous in Tanzhuang-Shenqiu Sag, Zhoukou Basin

周口盆地是华北地台南缘一个大型的中新生代沉积盆地，谭庄－沈丘凹陷是盆地中部中、新生代两期断陷叠合的次级构造单元，燕山期以来至少经历了6次差异升降运动。这些构造运动对地层的保存、有机质的热演化、油气的生成、运移、聚集起了控制作用。本文采用地震剖面、钻井分层、粘土矿物、镜质体反射率、声波时差5种方法进行剥蚀厚度的恢复，试图再现盆地发育史历史，以对油气藏的形成条件研究有所脾益。

Tanzhuang-Shenqiu sag,located in the central part of Zhoukou basin, a giant Mesozoic- Cenozoic Sedimentary basin at the southern margin of North China platform,is a secondary tectonic unit resulted from overlapping of two rifts of Mesozoic and Cenozoic,which experienced at least 6 differencial uplifting-subsiding since Yanshan period.These tectonic movements controlled formation preservation,thermal evolution of organic substances and generation,migration and accumulation of oil and gas.Five methods including seismic section, drilling formation layering, clay mineral,vitrinite reflectance and interval transit time were used to restore the degradated formation thickness and to render the development history of the basin.