湘中泥盆系佘田桥组作为太和堂-官家嘴地区重要的页岩气勘查层系，近年来的调查评价未有显著发现及突破，佘田桥组泥页岩埋深、厚度、地化及储层物性特征不清制约了该地区页岩气发现。在基础地质调查前提下，探索形成基于样品分析与地球物理识别的研究评价体系，以大地电磁（magnetotelluric, MT）地球物理勘查方法，结合样品分析手段，对该地区页岩气有利泥页岩层位赋存特征与分布规律这一关键基础地质问题进行了研究与评价。结果表明：①佘田桥组有利层位电阻率整体小于200 Ω·m；②佘田桥组厚度600 ~ 900 m，一般埋深0 ~ 1 000 m，MT测线共圈出15处断层，地层错动成多段；③佘田桥组有机质类型以Ⅱ₂型为主，有机碳含量在0.32% ~ 3.46%，平均为0.80%，成熟度R_o平均为1.78%，处于高熟阶段。

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.