Identification of Volcanic Lithology and Reservoir with Petrophsical Elastic Parameters:An Example of Yingcheng Formation in Xujiaweizi Fault Depression,North of Songliao Basin

There are many kinds of volcanic rocks with complex lithological characters in the Xujiaweizi faults.As volcanic rock lithology and reservoir seismic prediction is difficult,physical anylysis is needed for effective volcanic reservoir seismic prediction.Based on the 13 kinds of elastic parameter sensitivity analysis of the intersection,we use density and shear modulus in Yingcheng Formation of Xujiaweizi fault for the first time,and classify lithologic into three categories:basalt,andesite and rhyolite.In addition,the volcanic rock in each category shows the same reservoir parameters characteristics.On the basis of lithological distinction,the use of the density and longitudinal wave velocity of fluid two-parameter group can directly identify three categories of lithologic groups,which provides theoretical base for the prediction technologies of volcanic rock reservoir prestack inversion.