基于恒速压汞技术研究安塞油田S区储层孔隙结构特征

Study on pore structure characteristics of reservoir in block S of Ansai oilfield based on constant-rate mercury injection technology

为准确评价安塞油田S区储层孔隙结构特征,利用恒速压汞实验,研究了孔隙和喉道的分布特征以及孔喉半径比特征参数与孔渗间的关系。结果表明:不同渗透率的岩心样品孔隙半径分布范围基本相同,主要分布在120~340μm之间,平均孔隙半径在240μm左右;喉道半径主要分布在23μm以内;孔喉半径比与渗透率呈正相关关系,是影响S区储层渗流能力的主要因素。

In order to accurately evaluate the pore structure characteristics of reservoir in Block S of Ansai Oilfield,the distribution characteristics of pores and throats and the relationship between the charac-teristic parameters of pore throat radius ratio and porosity and permeability were studied by using constant-rate mercury injection experiment.The results show that the distribution range of pore radius of core samples with different permeability is basically the same,mainly ranging from 120 to 340μm,the av-erage pore radius is 240μm or so;The throat radius is mainly distributed Within 23μm;The ratio of pore throat radius has a positive correlation with permeability,which is the main factor affecting the percolation capacity of reservoir in Block S.