Method for judging oil-gas possibility of fluvial facies complex superposed lithologic trap by applying multi-interface AVO (amplitude versus offset) characteristics

The invention relates to the technical field of oil-gas exploration, in particular to a method for judging the oil-gas possibility of fluvial facies complex superimposed lithologic traps by applying multi-interface AVO characteristics. The method comprises the following steps that a multi-interface AVO calculation model of fluvial facies single-layer, multi-layer stacked and interbed sandstone is established, and the relation between fluvial facies sand body stratum occurrence and a pre-stack angle gather is determined; forming an AVO response template under different frequency excitation conditions; and calibrating the actual seismic trace set, and comparing the calculated AVO template with the AVO attribute of the actual seismic trace set. According to the method, the oil-gas possibility of the lithologic trap under the complex fluvial facies deposition condition can be effectively compared, and an effective means is provided for identification of interbed lithologic traps and lithologic traps with complex