塔中奥陶系碳酸盐岩储层缝洞特征

摘要

Statistical and stochastic modeling methods were adopted to analyze, quantitatively calculate and predict carbonate reservoir fracture and vug character of Ordovician reservoir in Tazhong Oilfield based on core, FMI and normal wireline logging data. The results show that fractures and vugs developed intervals are characterized by obvious low resistivity and maximum amplitude difference, high interval transit time and low logging density. Fractures are developed in Yingshan formation, which makes fracture permeability become largely higher than matrix permeability. Fractures and vugs have obvious effects on reservoir reconstruction and flowing proterties.%利用岩心、FMI成像和常规测井资料,采用统计分析和随机建模的方法对塔中奥陶系碳酸盐岩储层缝洞特征进行分析、定量计算和预测.结果表明:研究区奥陶系碳酸盐岩缝洞发育层段,电阻率出现明显低值,深浅幅度差最大,声波时差增大,密度降低；鹰山组裂缝比较发育,其储层裂缝渗透率远高于基质渗透率,表明缝洞对于改善奥陶系储层渗流特性非常明显.