Method for improving permeability of shale base blocks rich in organic matters

The invention provides a method for improving the permeability of shale base blocks rich in organic matters. An acid and an oxidizing solution are added in shale gas layer injection liquid. The liquid is injected in the shale base blocks rich in the organic matters, so that the shale organic matters and pyrites are oxidized and decomposed. Carbonate minerals are dissolved by the acid to form corrosion pores. Nanoscale pore reconstruction is realized, so that a seepage channel becomes large, the connectivity becomes good, and thus the permeability of the shale base blocks is improved. The method includes the steps of: selecting an oxidizing solution and the concentration according to the organic matter types and contents; respectively adding the oxidizing solution and hydrochloric acid into shale gas layer injection liquid; injecting the injection liquid into the shale base blocks rich in the organic matters; and flowing back the injection liquid after the injection liquid fully reacts with the shale. The method for improving the permeability of the shale base blocks rich in the organic matters can cooperate with the shale gas well hydrofracture reconstruction. The base block permeability is improved in a large range. The shale gas well output after the hydrofracture is raised. The operation technology is simple, and the economic cost is low.