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通过孔渗测定、电镜扫描、铸体薄片、阴极发光、高压与恒速压汞等测试手段,对鄂尔多斯盆地SMG探区长8段致密储层的孔渗关系、岩石学特征、孔喉结构及尺寸分布进行全面系统地剖析,结果表明:该区长8储层平均孔隙度为6.52%,平均渗透0.113×10-3μm~2,孔渗关系复杂,井间非均质性较强;储层碎屑组分以长石为主,属长石砂岩;发育粒间孔和长石等溶孔,绿泥石与泥质填隙物含量较高,使得孔渗条件进一步变差,属微孔-微喉型结构;依据压汞参数及毛管力曲线特征将长8储层分为3类:Ⅰ类为低门槛压力-高进汞饱和度型,Ⅱ类为低门槛压力-低进汞饱和度型,Ⅲ类为高门槛压力-低进汞饱和度型,Ⅰ类储层最好,属于“优质”储层,Ⅱ类次之,Ⅲ类最差。
The pore-water permeability, petrological characteristics, pore-throat structure and pore structure of the tight reservoirs in the 8th member of the SMG exploration area in the Ordos Basin were measured by means of pore permeation test, electron microscope scanning, cast thin film, cathodoluminescence, high pressure and constant pressure mercury injection The results show that the average porosity of Chang 8 reservoirs in this area is 6.52%, the average permeability is 0.113 × 10-3μm ~ 2, the porosity and permeability are complex and the cross-well heterogeneity is strong. The reservoir The detrital components mainly consist of feldspar, which are feldspar sandstones. The development of intergranular pores and feldspar such as dissolved pores, high content of chlorite and muddy interstitial material, making the porosity and permeability conditions further worse, is a microporous - Micro-throat type structure; According to the characteristics of mercury intrusion parameters and capillary curves, the Chang 8 reservoirs are divided into three types: Ⅰ type is low threshold pressure-high mercury saturation type, Ⅱ is low threshold pressure-low mercury saturation The type III is the high threshold pressure-low mercury saturation type. The type I reservoir is the best, which belongs to the “high quality” reservoir, the second is the second and the third is the worst.