Method and device for determining shale gas reservoir enrichment time node

The invention provides a method and a device for determining a shale gas reservoir enrichment time node. The method for determining the shale gas reservoir enrichment time node comprises the followingsteps of: collecting a shale gas reservoir stratum sample, wherein the shale gas reservoir stratum sample comprises carbonate mineral vein body of which the development is synchronous with shale gasreservoir enrichment; according to the shale gas reservoir stratum sample, manufacturing shale rock slices of different thickness, wherein each shale rock slice comprises the carbonate mineral vein body; on the basis of the multi-period secondary growth characteristics of the carbonate mineral vein body, determining a formative period secondary zone contained in each shale rock slice; according toan element scanning analysis result of the formative period secondary zone, selecting a testing zone; and carrying out an isotope test of a uranium element and a plumbum element on the testing zone,and on the basis of an in is