The Well-logging Evaluation Method of Tightly Fractured Sandstone Reservoir in Zhongyuan Oilfield

In order to effectively identify and evaluate tight-sandstone Triassic fracture reservoirs with characteristics of double porosity, the double calibration technology has been used. Under the constraints of geologic conditions and testing data, through study on lithologic, electronic,physical properties and HC existence in fractured reservoirs, the well logging response of fractured sandstone in Triassic has been summarized, and the effective method to identify fractured reservoir has been formed. In addition, the quantitative evaluation models on parameters of fractured reservoir have been constructed, and the oil and water identification standards for different blocks have been established. According to the testing results of twenty-one wells, the coincidence rate of this method with log interpretation results is up to 87.5%. With this method, the identification capability on fractured reservoir with well-logging data has been improved, and the quantitative evaluation on fractured reservoirs can be conducted