延长组致密油储层流体性质测井识别方法

Identification of Reservoir Fluid Properties of Tight Oil with Logs for Yanchang Group

Ordos盆地陇东地区延长组长6、长7、长8段为典型的致密油储层,具有储层物性差、非均质性强、孔隙结构和油水关系复杂等特点,严重影响了利用测井资料准确识别储层流体性质的能力。通过分析工区内65口井长6、长7、长8不同储层的岩性测井指示曲线、孔隙度测井曲线和电阻率测井曲线特征,优选出适用于陇东地区致密油的测井系列,利用三孔隙度测井曲线与电阻率曲线,构建反映储层含油性的识别致密油参数,将其用于识别延长组致密油储层的流体性质,直观快速解释符合率高,效果良好。

The sixth, seventh and eighth interval of Yanchang group of Longdong region in Ordos basin are typical tight oil reservoirs with poor reservoir properties, strong heterogeneity and complex relationship between pore structure and fluid features which have a serious impact on the use of log data to identify reservoir fluid capacity accurately. By analyzing the lithology logs, porosity logs and resistivity logs of the 65 wells of the sixth, seventh and eighth interval in the work area, we optimized the logging suites which are suitable for measuring in Longdong region, then we proposed a new parameter named oil discerning index （IOD） to identify reservoir fluid properties, interpretation is significantly improved, and get a good effect.