Abstract: The multichannel CDP stacking technology in marine seismic reflection is presented, the difference between the CDP stacking technology and the singlechannel seismic detection technology are described, and the key technologies in the detection of small geological bodies are analyzed in terms of principle, seismic source selection and observation system. The results of the drilling investigation show that the mentioned technology is satisfactory in detecting the boulders in weathered granite.

Key words: geophysical prospecting, seismic reflection wave, CDP stacking, marine area, water intake tunnel, weathered granite boulder