石油实验地质2018，Vol.40Issue(2)：288-294,7.DOI:10.11781/sysydz201802288
鄂尔多斯盆地富县地区长8层段致密砂岩储层特征及充注下限
Reservoir properties and hydrocarbon charging threshold of Chang 8 tight sandstones in Fuxian area, Ordos Basin
摘要
Abstract
Hydrocarbon charging threshold is the basis for tight oil accumulation research. The microstructure of Chang 8 tight sandstone reservoirs in the Fuxian area of Ordos Basin is very complicated, which is a key factor influencing hydrocarbon charging. Field emission scanning electron microscopy(SEM)and CT methods were used to quantitatively study the pore-throat characteristics of tight sandstone reservoirs. Mechanical properties, well logging and effective pore-throat analyses were used to determine the hydrocarbon charging threshold of physical properties and pore-throat characteristics. The results showed that the pore size of tight reservoirs is dominated by nanometer and submicron scale, and the average pore radius is 1.2 μm. The average radius of throat is 0.1 μm,which belongs to micropore-fine throat reservoirs. It was calculated that the charging threshold of porosity of Chang 8 tight sandstone reservoirs is 4.5%,and that of permeability is 0.04×10-3μm2.The threshold of pore-throat diameter on the source and reservoir interface is 15.77 nm,and that inside reservoir is 24 nm. We integrated that oil and gas might occur in nano-scale pores as oil bead, throat or thin film as compaction and cementation effects became stronger.关键词
微观结构/致密油储层/充注下限/赋存/长8层段/富县地区/鄂尔多斯盆地Key words
microstructure/tight reservoir/hydrocarbon charging threshold/occurrence/Chang 8 member/Fuxian area/Ordos Basin分类
能源科技引用本文复制引用
邓亚仁,任战利,马文强,陈西泮,杨桂林,南卡俄吾..鄂尔多斯盆地富县地区长8层段致密砂岩储层特征及充注下限[J].石油实验地质,2018,40(2):288-294,7.基金项目
国家自然科学基金"鄂尔多斯、沁水沉积盆地中生代晚期古地温场对岩石圈动力学演化及油气赋存的约束作用"(41630312)资助. （41630312）
