Abstract：Experiment with transient electromagnetic sounding was conducted by using single-pulse powerful portable transient electromagnetic sounder in Fushan depression in Hainan Province.The experiment has brought the following preliminary resuits: •reasonable data acquisition method,which uses the overlapped loop system,400m of the single side length,100A of transmitted pulse current,40ms of power supply time,and 160ms of sampling length. •The maximum probing depth is 2000m when the method is used reasonably. •The undulation shape of inversion interface can be correlated to that of sounding data at known borehole,the average depth error being 10%,and the minimum depth error being 2 % only. •The maximum probing depth may be 3500m when single side length of the loop is 600m,transmitted pulse current 200A,and sampling length 640ms. We can see from the experiment that transient electromagnetic sounding method has good application in oil exploration of volcanic rock and carbonate rock areas in South China where seismic exploration effect is poor.
