Method for controlling track before while-drilling geosteering target-entering of shale gas horizontal well

The invention relates to a method for controlling a track before while-drilling geosteering target-entering of a shale gas horizontal well. The method for controlling the track before while-drilling geosteering target-entering of the shale gas horizontal well comprises the following steps that geological data of a standard well, a drilled pilot well, an adjacent well in the area of a to-be-guidedhorizontal well are collected, a drilling program of the to-be-guided well and real-time data of the to-be-guided well are collected, and a guide standard well and a reference well are defined according to the data; a guiding intervention point is defined, and a guide intermediate point is defined; the guide intervention point is controlled to the guide intermediate point; by comparing the data ofthe to-be-guided well and the standard well and the reference well, geosteering marker beds are divided, and the position of a drill bit and the formation dip angle are judged; and according to the vertical depth and thicknes