中文摘要：

为定量评价特低渗透砂岩的微观孔喉非均质性，以鄂尔多斯盆地西峰油田长8储层为例，利用先进的恒速压汞技术对孔喉参数进行了测试．结果表明，不同渗透率级别的样品，孔隙参数的差异小，非均质性弱，孔隙半径介于80~300μm范围内；微观孔喉的非均质性主要体现在喉道特征参数上，喉道参数制约储层品质影响开发效果；样品渗透率越大，喉道半径越大，分布范围越宽，大喉道含量越高，同时大喉道对渗透率的贡献也随之增加，渗透性主要由占少部分的较大喉道来贡献；平均喉道半径和主流喉道半径与渗透率表现出了非常好的相关关系，渗透率越小，受喉道参数的影响程度越强．较大的孔喉比和较宽的分布区间是特低渗透砂岩储层的显著特点，也是开发效果差的主要原因，不同渗透率级别的储层，开发过程中应根据喉道大小及其分布范围区别对待．

英文摘要：

The pore and throat parameters are tested using constant rate mercury penetration technique taking the Chang8 reservoir of Xifeng oilfield as example in order to evaluate the micro-pore throat heterogeneity quantitatively. The results show that there are no obvious differences of pore parameters and strong heterogeneity, the pore radius distributes in 80~300μm for different permeability level samples. The heterogeneity is mainly presented in throat parameters which restrict reservoir quality and affect development effect. The throat radius will be greater, distribution range will be wide and big throat content will be higher with the increasing permeability, meanwhile,contribution of big throat to permeability will run up. The permeability is contributed mainly by a few big throats. Average throat radius, main flow throat radius and permeability show very good correlation, the smaller the permeability is, the effects degree of throat parameters is stronger. Larger pore throat ratio and wider distribution interval is the prominent characteristics for extra-low permeability sandstone, is also the main reason for the poor development effect. The different permeability level reservoir should be developed differently according to the throat size and its distribution.