北堡油田中区东营组储层非均质性研究

储层非均质性包括微观和宏观非均质性。通过对岩心薄片、铸体薄片、电镜、Ｘ－衍射等试验数据以及测井储层评价数据分析，揭示冀东北堡油田中区东营组储层非均质特征为：储层岩石成分复杂，不稳定组分含量高，分选差，含泥沙质结构；压实作用、溶蚀作用及粘土矿物转化现象普遍，成岩变化大；中小孔细喉结构，连通性差，微观非均质性强。宏观非均质性较强，层内纵向上渗透率差异明显，渗透率非均质参数值较大；层间非均质程度与层内的相近；平面非均质性强，砂体连通性差，有效砂层系数较小，非均质参数在平面上变化大。采用压裂措施，降低储层非均质性，改善储层连通性，可提高开发效果。

STUDY ON THE RESERVOIR HETEROGENEITY OF DONGYING FORMATION IN THE CENTRAL AREA OF BEIBAO OILFIELD

Reservoir heterogeneity includes microheterogeneity and macroheterogeneity. The central area of Beibao is located in the west of Nanbao depression. Dongying Formation is one of the major reservoirs in Beibao area. Its reservoir heterogeneity was studied by analysis of core thin sections, cast thin sections, characteristics of cores in scanning transmission electron microscope, X ray test data and data of well log reservoir evaluation. The study shows that reservoir of Dongying Formation is lithologically characteristerized by complex rock composition,high contents of unstable components, poor sorting and shale sand structure. The compaction, corrasion and conversion of clay minerals in the Dongying Formation are very common, but the diagenetic features change greatly. Besides, the reservoir has middle low thin throat structure and its connectivity is very bad, consequently reservoir has higher microheterogeneity. Reservoir macroheterogeneity is also high. Its internal longitudinal permeability has obvious differences and the value of permeability heterogeneity parameters is greater. Inter layer heterogeneity of reservoir is similar to internal heterogeneity. Reservoir plane heterogeneity is higher due to bad connectivity, low effective sand coefficient and changes of heterogeneity parameters on the plane. By using fracturing methods, reducing reservoir heterogeneity and improving reservoir connectivity, the efficiency of development can be increased.