华庆地区长81储层微观孔隙结构特征研究

Microscopic pore structure characteristics of Chang 8_1 reservoir in Huaqing area

通过铸体薄片、高压压汞、核磁共振以及恒速压汞等测试化验手段,深入研究了鄂尔多斯盆地华庆地区长81储层的微观孔隙结构特征,并分析了微观孔隙结构对流体微观赋存状态及其可流动性的影响。结果表明:华庆地区长81储层微观孔隙结构类型复杂,其中粒间孔-溶蚀孔孔隙组合类型连通性较好,孔喉半径较大,可动流体饱和度高,是有利于孔隙流体渗流的优势通道。孔喉类型、孔喉连通性、孔喉半径以及黏土矿物含量综合影响着孔隙流体的赋存状态及其可流动性,其中喉道大小对储层流体的渗流能力起主要控制作用,尤其是大喉道对储层渗流能力的改善具有明显优势。

Based on investigation of cast slices,high pressure mercury injection,nuclear magnetic resonance and constant speed mercury injection,this paper studied the microscopic pore structure and microscopic pore fluid characteristics of Chang 81 reservoir in Huaqing area.The result shows that the microscopic pore structure types of Chang 81 reservoir are complex,among which intergranular pore-dissolved pore combination type is perfect,with better connectivity,pore throat radius is larger,and the movable fluid saturation is higher.And this pore combination type is the advantage channel for fluid filtration.Pore throat type,pore throat connectivity,pore throat size and clay mineral contents together affect the pore fluid occurrence and flowability.The pore throat size plays a main role,especially the larger throat has an obvious advantage in the improvement of seepage ability.