储层沉积微相与储层非均质性关系研究——以文留油田文65断块沙二下为例

Relationships between Reservoir Sedimentary Microfacies and Reservoir Heterogeneity ——By taking the Lower Member of Es_2 in Block Wen 65 as An Example

文留油田文 6 5块发育水下分流河道、水下分流河道侧翼、水下天然堤、水下分流间湾、滨浅湖泥 5种微相。储集砂岩以水下分流河道为主 ,水下分流河道侧翼和水下天然堤次之。水下分流河道砂岩分层系数大 ,砂岩密度高 ,顺物源方向砂体连通性较好 ,垂直物源方向连通性变差 ,渗透率的垂向韵律表现为复合韵律或均匀型 ,非均质性程度中等偏弱。水下分流河道侧翼、水下天然堤等微相分层系数小 ,砂岩密度低 ,渗透率表现为正韵律 。

Five microfacies of subsea distributary channel, its flank, subsea natural barrier, subsea interdistributary bay and coastal or neritic shale are developed in Block Wen 65 of Wenliu Oilfield. The reservoir sandstone is mainly composed of subsea distributary channel, where subsea distributary channel flank and subsea natural barrier are next. In the distributary channel, the sandstone stratification coefficient is big, its density is high, sandbody communication is good along the source direction, and poor along vertical source direction, vertical rhythm of permeability presents composite or uniform one, the degree of heterogeneity is medium to weak. Microfacies stratification coefficient of the subsea distributary channel flank and subsea natural barrier is small, sandstone density is low, permeability presents normal rhythm, the degree of heterogeneity is medium to high.