Shale gas stratum geostress prediction method based on three-dimensional seismic data

The invention provides a shale gas stratum geostress prediction method based on three-dimensional seismic data, which belongs to the field of shale gas geophysical exploration. The method comprises the steps that three-dimensional prestack seismic data and logging data are used to carry out prestack elasticity parameter inversion to acquire the elasticity parameters of a shale gas stratum; three-dimensional post-stack seismic data and stacking velocity data are used to acquire the seismic layer velocity to calculate the stratospheric pressure; the curvature of the shale gas stratum and the construction strain in horizontal direction are calculated based on the three-dimensional post-stack seismic data and seismic horizon data; and finally, according to a linear isotropic combined spring mode, the maximum horizontal principal stress, the minimum horizontal principal stress and the horizontal stress difference of the shale gas stratum are calculated through three-dimensional data bodies such as the elasticity p