Research on full-space apparent resistivity interpretation technique in mine transient electromagnetic method

In this paper, full-space late-time and all-time apparent resistivity formula was derived based on homogeneous full-space response equation of central loop. By comparing with half-space formula and analyzing measured data, the application efficiency of this formula was studied. The results indicate that full-space apparent resistivity value is (5/2)(2/3) times that of half-space; and the relative error between its late-time value and true resistivity is less than 0.56%, while the error of half-space resistivity is greater than 42%. Compared with normal interpretation technique, this method can locate anomaly range, and acquire large resistivity contrast. Therefore, the inter-pretation technique has better applicability and effect for mine transient electromagnetic data.