The development and utilization of shallow geothermal resources is one of the important means to achieve carbon neutrality. A fine assessment of the shallow geothermal resource is crucial for the construction planning and sustainable development. The precise calculation of exploitable resource amounts and the delineation of target areas for distribution are of significant importance for the extraction of shallow geothermal resources using ground-source heat pumps, as well as for the stability and performance of the heat pump system. Currently, the volume method is widely used in the evaluation of geothermal resource. However, the calculation parameters of the reservoir (such as thickness and density) lack small block attributes, and the integration of geophysical results into the fine calculation of geothermal resource has not been effectively realized. Based on the traditional geothermal resource evaluation volume method, this study incorporates geophysical detection results of layer thickness and density parameters into the calculation of shallow geothermal resource reserves. Through targeted calculations with geological structure information, the evaluation accuracy has been significantly improved. Combining the stratigraphic characteristics, topographic variations, and other factors in the study area, the evaluation region is grid-based. Within each small block, high-frequency background noise is used to extract dispersion curvesofdifferentbandwidths, anddifferent lithology layer thicknesses and layer densities are then inverted to calculate the shallow geothermal resource amount in that block. The improved method not only allows for a more detailed evaluation of geothermal resource reserves, but also helps to delineate the most suitable target areas for the development and utilization of shallow geothermal resources, providing a refined and referenceable basis for subsequent decision-making.