The Rapid Assessment of Productivity in Ultra-low Permeability Reservoir——By Taking Chang 81 Reservoir of Yanchang Formation in Jiyuan Area for Example

The traditional productivity prediction methods such as the single factor method of effective permeability statistical method,formation coefficient method and the apparent mobility method were not appropriate for predicting the productivity in ultra-low permeability reservoirs.On the basis of analyzing the influential factors of productivity prediction,the influence factor of the productivity prediction were analyzed by using the grey association analysis.Based on multi-element linear regression,a new method for rapid productivity evaluation is proposed,the new method has the characteristics of simple,rapid evaluation with high reliability.