Abstract: Two-dimensional seismic surveys are one of the important means of regional geological surveys.Through the application of 2D seismic exploration in the geological survey of the southern plain of Tianjin, it revealed successfully the depth and spatial distribution characteristics of the paleo-channels, the Quaternary and the Cenozoic bottom boundary, ascertained the tectonic framework of the research area, realized the strata, researched the ups and downs of the thick large coal seams of 5 coal and 10 coal, determined the preferred target layer of shale gas, and verified the 2D seismic exploration results by drilling, testing etc.The prediction error of the bottom depth of the paleo-channel is 3.6%; the bottom boundary of Quaternary is 8.4%; the bottom boundary of Cenozoic is 0.7%; the 5 coal is 0.4%; the 10 coal is 1.3%; the preferred target layer of shale gas is 0.7%.The results show that the prediction errors of this 2D seismic are all within 10%, which complied with the relevant requirements of the specification.For the deep coverage area of Quaternary, it is feasible to use the 2D seismic exploration technology to solve problems in the geological survey.