页岩油微纳尺度储集空间特征研究——以东营凹陷利页1井为例

Research on the Characteristics of Micro and Nanoscale Storage Space of Shale Oil in Well Liye 1,Dongying Depression

为了分析页岩油的微观储集空间特征,选取利页1井沙河街组Es3~x和Es4~s页岩油层段样品,综合利用场发射扫描电镜与低温N2等温吸脱附技术,定性、定量地分析了页岩油样品的微观孔隙类型、孔径分布特征及其主控因素。研究表明:Es3~x和Es4~s油层段孔隙类型主要包括粒间孔、粒间微缝、溶蚀孔、晶间孔、晶内孔;储层孔隙主要为纳米级孔隙,孔径为1.6~46.0 nm,峰值集中在3.0~6.0 nm;比表面积与深度总体呈正相关;目标层段3 600—3 800 m处黏土矿物演化为纳米级孔隙的保存提供了有利条件。

This paper selects samples from Es3^x and Es4^s of well Liye 1 for analyzing micro and nanoscale storage space characteristics. The types, radius and influencing factors of pores are studied through SEM and low - temper- ature Nitrogen adsorption to analyze the shale oil samples qualitatively and quantitatively. The results show that the pore types of Es3^x and Es4^s mainly include intergranular pores, intergranular micro -fractures, dissolution pores, intergranular pores, and intracrystalline pores. The pores are mainly nanoscale pores, and the pore diameter distri- bution range is 1.6 -46.0 nm, with the peak concentration of 3.0 -6.0 nm. The specific surface area and depth are positively correlated. The evolution of clay minerals at the target level 3 600 - 3 800 m provides favorable con- ditions for the oreservation of nanoscale Bores.