什股壕地区下石盒子组储层孔隙结构特征

Pore Structure Characteristics of Lower Shihezi Formation in Shiguhao Area

什股壕地区下石盒子组储层为主力产气层,通过对该储层孔吼特征进行研究表明:盒3段好于盒2段,盒2段储集性能相对盒1较好。该区孔喉分布曲线以Ⅱ型为主,其渗透率贡献主要来自粒间孔-缩颈喉道,为较好储层。Ⅱ类压汞曲线形态为平缓倾斜直线段,一般平缓平台发育较弱,且平台较高,说明该类储层主要为粒间孔(次生溶孔)+粒内孔喉发育,孔喉分选略好,主要为中孔-中喉型储层,为较好储层,是该区有利储层的主要孔吼结构类型。

The reservoir of Lower Shihezi formation in Shiguhao area is the main gas producing reservoir.The research on the pore roar characteristics of the reservoir shows that,box 3 is better than box 2 and the reservoir performance of box 2 is better than box 1.The distribution curve of pore throat in this area is mainly typeⅡ,and its permeability contribution mainly comes from inter granular pore necking throat,which is a better reservoir.The typeⅡmercury pressure curve is a flat inclined straight section,generally flat platform is weak and the platform is relatively high.It shows that the reservoir is mainly intergranular(secondary dissolution hole)+intragranular pore throat development,and the pore throat is slightly sorted,mainly medium pore medium throat type reservoir,which is a better reservoir,and is the main pore roar structure type of favorable reservoir in this area.