Abstract：Seismic-geology characteristics of volcano stratigraphy of Yingcheng Formation are discussed in this paper by integrated analyses of volcanic boundary,volcanic units and seismic facies units.There are three viewpoints about seismic-geology characteristics of volcanic rocks.Firstly,almost boundaries of volcano stratigraphy of Songliao Basin are the angle or volcanic disconformity;the others are parallel disconformity or conformity.Secondly,volcano stratigraphy units can be divided into cooling units,cooling unit group,volcanic edifices and volcanic edifices group according to the building process and the boundary characteristic.In the resolution of current seismic data can exact reveal the volcanic edifices or its group.Thirdly,seismic facies units of 1st and 3rd member of Yingcheng Formation are divided into 9 types.They are sheet-shaped,sheet-shaped drape,shield-shaped,mount-shaped,lens-shaped,wedge-shaped,fan-shaped,saucer/plate-shaped and pipe-shaped.The seismic facies units can be explained to the volcanic edifices.The dip angle of volcanic rock beds decreases from central to distal parts along a given edifice's limb.The relative geological framework of volcano stratigraphy(cooling unit group) can be built according to the overlap sequence of rock beds in seismic facies units.This is a new way to characterize the volcano stratigraphy.
