Based on the completed well site survey data, combined with the results of the previous region, the engineering geological layer and the ground-layer sequence of the shallow geological layer of the xii exploration area were divided, and the shallow geological structure was initially established. In the depth range of 40m below the seafloor, the rock nature of the top to bottom formations is silt clay layer, hard clay layer, gravel-bearing sand layer, clay layer and sand layer, respectively, corresponding to the formation of the era for the new period of the world sea invasion and late, medium and early.
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