鄂尔多斯盆地姬塬油田长6储层物性特征

Analysis of Microscopic Reservoir Pore Structure of Chang 6 Reservoir in Jiyuan Area of Ordos Basin

为进一步明确鄂尔多斯盆地姬塬油田长6段储层物性特征,利用岩心观察、铸体薄片、扫描电镜、粘土矿物及粒度分析等测试手段,对姬塬油田长6储层进行物性特征研究。结果表明:长6段储层孔隙度分布在6.0%~15.0%之间、渗透率分布在0.1×10^(-3)μm^2~3.0×10^(-3)μm^2,属于低孔、低渗致密砂岩储层,同时,储层物性较好的砂体呈条带状分布,储层微观孔隙结构是影响渗透率的主控因素,沿砂体延伸方向的物性变化小,垂直砂体延伸方向的物性变化大,即向砂体两侧方向物性明显变差。

In order to know the physical properties of Chang 6 reservoir in Jiyuan of Ordos Basin,some means such as core observation,casting section,scanning electron microscope,clay mineral and grading analysis are used in the research.The result shows that the porosity of Chang 6 reservoir is distributed mainly from 6.0% to 15.0% and permeability is from 0.1×10^(-3)μm^2 to 3.0×10^(-3)μm^2,which reflects that Chang 6 reservoir in Jiyuan belongs to low porosity and low permeability reservoir.Meanwhile it is found that the sand in good reservoir is band distribution and the permeability is mainly controlled by the microscopic pore structure.The properties of sand extend direction changes lightly,while vertical sand extend direction changes greatly,which reflects that the properties become bad obviously to the edges of the sand.