Coal Mine Detection
According to the micro motion profile combined with drilling data, the geological properties of the strata above 100-130 meters underground in Line 1 are clay, and the corresponding phase velocity of the strata is below 700m/s; Underneath the clay is a medium to fine grained and coarse-grained sandstone formation, with a thickness of about 150m and a phase velocity ranging from 700m/s to 1000m/s; The phase velocity of 1000m/s-1050m/s is speculated to be coal seam, with a depth of 230m-320m; Underneath the coal seam is sandstone.
Line 2 infers that the formation above 120m is clay, and the corresponding phase velocity of the formation is below 700m/s; Underneath the clay is a medium to fine grained and coarse-grained sandstone formation, with a thickness of about 150m and a phase velocity ranging from 700m/s to 1000m/s; The phase velocity of 1000m/s-1050m/s is speculated to be coal seam, with a depth of 210m-310m; Underneath the coal seam is a dense sandstone formation.
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