溶孔-粒间孔组合对超低渗透储层物性的影响——以西峰油田庆阳区长8油层为例

The impact of combination of dissolved pore-intergranular pore on ultra low permeability reservoir physical property:an example from Chang 8 reservoir of Qingyang district in Xifeng Oilfield

目的研究溶孔-粒间孔组合对超低渗透储层物性的影响。方法通过岩石薄片、铸体薄片、扫描电镜、恒速压汞等先进的实验方法和系统的分析化验，微观、定量分析各类孔隙及其孔隙结构特征以及对储层物性的影响。结果与庆阳全区长8储层相比，庄58井区由于溶孔-粒间孔较发育，使得长8储层喉道半径（0．1—2．61μm）、孔隙度（11．5％）、渗透率（1．17×10^-3μm^2）分别好于全区长8储层喉道半径（0．1—1．0μm）、孔隙度（10．9％）、渗透率（0．68×10^-3μm^2）。结论发育溶孔一粒间孔组合的储层，其物性相对较好。

Aim To get the impact of combination of dissolved pore-intergranular pore on ultra low permeability reservoir physical property. Methods Through the application of casting section, scanning electron microscope, rate mercury injection apparatus and nuclear magnetic resonance and other advanced experimental methods and systematic analysis of laboratory data, micro, quantitative analysis of various pores and characteristics of its pore structure, as well as the impact of reservoir properties. Results Because Zhuang 58 develop combination of dissolved pore-intergranular pore, the throat radius（0. 1 - 2. 6 μm）of reservoir are bigger than the throat radius（0. 1 - 1.0 μm） of Chang 8 reservoir of Qingyang district, the porosity （ 11.5% ） of reservoir is better than the porosity （ 10. 9% ） of Qingyang distric ,the permeability（ 1.17 - 10^-3 μm^2 ） of reservoir is better than the permeability（0. 68 - 10^-3 μm^2）. Conclusion The reservoir physical property is good ,where the combination of dissolved pore-intergranular pore is developed.