The Shetianqiao Formation of the Devonian in central Hunan is an important shale gas reservoir in the Taihetang- Guanjiazui area. However, limited understanding of its geophysical and geochemical signatures has hindered the gas reservoir's large-scale exploration and exploitation. A research and development methodology was presented here based on sample analysis and geophysical characterization. Specifically, the method utilized quantification of shale gas occurrence characteristics and distribution patterns in the Shetianqiao Formation using sample analysis and the magnetotelluric (MT) geophysical data inversion technique. The results show that the overall resistivity of favorable layers in the Shetianqiao Formation is less than 200 Ω·m, with a thickness range of 600 to 900 meters and an average burial depth of 0 ~ 1 000 meters. Furthermore, the MT method reveals 15 faults and their associated multiplexing segments. It is also confirms that the organic matter in the Shetianqiao Formation is primarily II₂, with an organic carbon content ranging from 0.32% to 3.46% and an average at 0.80%. The average maturity R_o of the formation is 1.78%, indicating a high maturity stage.