大牛地气田奥陶系岩溶缝洞型储层识别预测方法OA

The Lower Paleozoic gas reservoir in Daniudi gas field is mainly formed by medium and small scale karst fractured-vuggy reservoirs,it is difficult to identify and evaluate fractured-vuggy quantitatively compared with Tarim and Sichuan Basins.Based on core,wafer,convention-imaging logging and geophys-ical data,the types and characteristics of karst fractured-vuggy reservoirs have been defined and we devel-oped a set of quantitative identification and prediction methods.The main views are as follows:①Pore types of reservoir in the study area are divided into three categories:pore,fracture-vuggy and fractured-vuggy types according to geological characteristics,and the comprehensive identification template for karst frac-tured-vuggy reservoirs have been established;②Different reservoir types can be classified quantitatively according to the stepwise discriminant analysis based on Bayes criterion,and reservoir types explained by the discrimination model are basically consistent with the drilling data;③The prediction for reservoir and gas-containing property of karst reservoirs used by the ant-body based on the maximum likelihood attrib-ute and instantaneous frequency attribute can form a set of karst reservoir prediction methods combining with wells and geophysics,which provides important basis for the study of reservoir spatial distribution,optimiza-tion about well location and fracturing reconstruction.