合水油田庄51井区长6_3油层储层非均质性研究

The Heterogeneity of Chang 6_3 Reservoir in Wellblock Zhuang-51 of Heshui Oilfield

通过对测井曲线、岩石薄片以及压汞等资料分析,对合水油田庄51井区长6_3油层的储层层内、层间、平面以及微观非均质性特征进行了定性分析。研究表明:长6_3油层的储层层内非均质性受沉积韵律和层内夹层的影响,整体表现为中等非均质性,其中长6_3~3小层的储层最为均质,长6_3~2小层和长6_3~1小层非均质性稍强,为均质-中等非均质;层间隔层较为发育,层间非均质性强;平面上,砂体的平面展布和物性平面分布受沉积相的控制,砂体侧向连通性较差,物性变化大,非均质性较强;微观孔隙结构受成岩作用影响大,会增强储层非均质程度。总体而言,研究区长6_3油层可被定义为中等-较强非均质性。

By analyzing the logging data,rock core slices and mercury injection data,the characteristics including interlayer,the intralayer,areal heterogeneity and microscopic heterogeneity of Chang-6_3 Reservoir in Wellblock Zhuang-51 of Heshui Oilfield were qualitatively analyzed.The results show that the interlayer heterogeneity of Chang 6_3 was of intermediate heterogeneity in the whole,which was affected by sedimentary rhythm and intraformational bed,in which 6_3~3 was the most homogeneous reservoir and the interlayer heterogeneity was weaker in Chang 6_3~2 and Chang 6_3~1 Reservoirs which was defined as homogeneous-intermediate heterogeneity.Furthermore,spacers were relatively developed with strong interlayer heterogeneity.The plane distribution of sand body and physical property was controlled by the sedimentary facies,therefore the lateral connectivity of sand body was poor with great physical property variation and strong heterogeneity.The microscopic pore structure,which was influenced by diagenesis,could enhance the degree of heterogeneity.Totally,Chang 6_3 Reservoir can be defined as the medium-strong heterogeneity in the studied area.