Method and device for determining earthquake fluid sensitive factor

The invention discloses a method and device for determining an earthquake fluid sensitive factor. The method includes the steps that a corrected earthquake thin-film reflection formula is obtained after a non-elastic term is added to an earthquake thin-layer reflection formula; a gas well and a water well which can represent regional reservoir characteristics are selected and then a rock physical model is built; the rock physical model serves as a research object, and the range of an incident angle phi and frequency fV sensitive to fluids are determined according to the corrected earthquake thin-film reflection formula; earthquake pre-stack data sub offset distances are superposed and undergo frequency division processing, and data of incident angles smaller than phi and larger than phi are superposed and undergo frequency division so that two data bodies can be formed; values around the known well are read on the two data bodies, and plane intersection is carried out, so that a straight line formula capable of distinguishing the two data bodies is solved; the earthquake fluid sensitive factor is determined after the straight line formula undergoes mathematical conversion. By means of the method and device, earthquake gas and well prediction capacity of a complex reservoir can be improved.