友谊油田沙三上储层非均质特征

RESERVOIR HETEROGENEITY IN THE UPPER SHA3 MEMBER OF YOUYI OILFIELD

储层非均质性影响油藏开发效果，控制剩余油的分布，因此以岩心分析资料、铸体薄片及测井二次精细解释结果为依据，从微观、层内、层间及平面4个层次对储层的非均质特征进行研究。结果表明，该区属于强非均质性储层，夹层厚度较大，分布稳定，隔层钻遇率高，对油水起到很好的屏障和隔挡。平面上，砂体分布连续性差，导致油层连通性差、剩余油分布规律复杂。沉积微相及成岩作用是该区储层非均质特征的主控因素。

Development effect of a reservoir and its residual oil distribution are influenced and controlled by reservoir heterogeneity. Thus reservoir heterogeneity is studied in tollowing four aspects： microscopic, innerlayer, interlayer and areal based on core analysis, cast thin and secondary fine interpretation. Results show that reservoirs in this area are very heterogeneous, and the thickness of interbeds is larger with stable distribution and higher penetration probability. All these features have favorable shielding and barrier effect on oil and water. Arealy, poor continuity of sand body distribution causes poor communication among reservoirs and complicated residual oil distribution. Sedimentary microfacies and diagenesis are the prineipal controlling factors of reservoir heterogeneity.