松辽盆地低渗透储层孔隙结构及分形特征

针对松辽盆地王府断陷泉头组低渗透储层孔隙结构认识不清的问题,运用储层孔隙分形方法,结合X射线衍射、铸体薄片、扫描电镜以及压汞等实验方法,确定了该低渗透砂岩储层的孔隙分型特征,并讨论了分形维数与储层物性、储层矿物组分之间的关系.实验结果表明:该地区储层孔隙以粒间孔和粒内溶孔为主;矿物成分主要为石英和长石;储层孔隙具有多重...

Pore Structure and Fractal Characteristics of Low-permeability Reservoirs in Songliao Basin

To address the problem of unclear understanding of the pore structure of low-permeability reservoirs in Quantou Formation,Wangfu Fault Depression,Songliao Basin,the fractal method of reservoir pores was applied in combination with experimental methods such as X-ray diffraction,casting slice,scanning electron microscopy,and mercury intrusion porosimetry,to determine the pore fractal characteristics of the low-permeability sandstone reservoir and discuss the relationship between the fractal dimension and the physical properties and mineral composition of the reservoir.The experimental results showed that:the pores of the reservoir in this area were mainly intergranular pores and intragranular dissolved pores;the mineral components were mainly quartz and feldspar;the pores of the reservoir were of multiple fractal characteristics,and the structure of small pores was better than that of medium and large pores;the fractal dimension was unrelated to the reservoir porosity,but closely correlated with permeability and mineral composition.This study discovers the pore size distribution characteristics of low-permeability reservoirs from the perspective of multiple fractal theory,and provides a basis for the development of low-permeability reservoirs in Quantou Formation,Wangfu Fault Depression,Songliao Basin.