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i work at marabaie group co in ksa asengineering kidney love football,swimming and play stastion geophysical survey. the nature and physical properties of the host rockand cavity in fill material will also effect the amplitude and width of geophysical anomalies associated with voids. seismic methods this method can not usually be directly applied to the locationof cavities exceptwhere the void are in the eorm of near vwrtical feature such as open fissure and mineshafts .the in fill of cavities is usually of lower velocity thann the surrounding rocks and this is the reason of the upper surface of avoid cannot act as seismicrefractor.however when the voids are open .alow velosity chronostratigraphically constrains both the sedimentological and fault-mechanical stratigraphy of a basin. Furthermore, it can provide a predictive model extrapolated beyond the borehole as to aspects of the quality of potential reservoirs and seals, their