In recent years,the success rate of turbidite reservoirs in Dongying depression is reduced,and the existence of gray matter is the main factor affecting the prediction accuracy of turbidite reservoir.In order to accurately identify the turbidite reservoirs in the gray matter development area,the petrophysical parameters such as the velocity,density and Lame parameters of sand,gray and mudstone are analyzed and using the histogram technique to select the effective lithological recognition factor F in the region.The AVO equation is deduced based on the sensitive reservoir recognition factor and F according to the Aki-Richards approximation equation.The prestack elastic impedance equation based on lithology recognition factor F is obtained by using Connolly pre-stack inversion method.The equation is used to analyze the model and the actual data and the results show that the method can effectively identify the turbidite reservoir in the gray matter development area.