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根据物探和钻探资料，研究区内第四纪沉积物可分为两部分，下部地震反射结构复杂，斜层理发育，粒度较粗，为晚更新世产物；上部的地震反射结构简单，呈水平状或近水平状结构，粒度较细，为全新世沉积。
According to the geophysical and drilling data, the Quaternary sediments in the study area can be divided into two parts. The seismic reflection structure in the lower part is complex, the oblique bedding develops and the grain size is coarse, which is the late Pleistocene product. The upper seismic reflection structure is simple and horizontal Shape or near horizontal structure, smaller size, for the Holocene deposition.