119 4. Near-surface reflection surveying Figure 4.25 Distribution of karstic bodies. Top: the 80 to 90 m depth interval. Bottom: the 100 to 120 m depth interval. The 3D block is composed of elementary cells (2.5 m in the in-line direction, 5 m in the cross-line direction, and 1 m deep), which clearly show the connectivity of the karstic bodies. The local validation of the results obtained by the 3D seismic method was achieved using full waveform acoustic data and VSP, recorded in 11 wells in 2014 and 2015 respectively (Mari and Porel, 2018).
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