安塞油田H区长6油层组储层非均质性与含油性关系研究

通过对安塞油田H区长6油层组岩心观察、测试及测井资料的统计分析和研究,讨论了研究区长6油层组长61-2、长62-1和长62-2小层的非均质性特征,并分析了各类非均质性对储层含油性的影响和控制作用。研究表明,长6油层组各小层层内和层间非均质性整体较强,平面非均质性较弱。储层垂向上粒度的韵律性及层理构造特征是影响储层含油性的重要因素;层内渗透率非均质性及层间分层系数的差异对储层含油性的影响较弱;层间有效砂岩密度的差异对储层含油性具有一定的控制作用,但不是主要控制因素;储层含油性主要受储层砂体平面展布和储层物性的控制;储层孔隙结构的微观非均质性控制着油气进入储层的饱满程度。

The relationship of heterogeneity and oil-bearing property of Chang 6 reservoir at H area in Ansai Oilfield

Based on core observation,testing and logging data of Chang 6 reservoir at H area in Ansai Oilfield,the heterogeneities of Chang 61-2,Chang 62-1 and Chang 62-2 sublayers are studied,and the effect and control action of the heterogeneities on oil-bearing property are analyzed.The result shows that there are strong interlayer heterogeneity and strong in-layer heterogeneity,but weak planar heterogeneity of Chang 6 reservoir in the study area.The rhythmicity of grain size in vertical direction and the stratification features are important factors for the hydrocarbon distribution.The in-layer permeability heterogeneity and the difference of stratification coefficient between each sublayer play a weak role in controlling the hydrocarbon distribution.The difference of sand density also controls the hydrocarbon distribution,but not the main controlling factor.The oil-bearing properties are mainly controlled by the sand body distribution and reservoir properties,and the microscopic heterogeneity in pore structure controls the full degree of hydrocarbon entering into the reservoirs.