建立图3中的半空间地层模型，上半部为空气，下半部为均匀地层，空气电阻率

Establish the half-space formation model in Figure 3. The upper half is air and the lower half is uniform formation. The air resistivity is set to 106Ω·m and the formation resistivity is set to 10Ω·m. The frequency of 30KHz is used to set the hole spacing of 30m and 70m for forward calculation, and the results are shown in Figure 4. There are analytical solution formulas for uniform space calculations, and the results are shown in Figure 5.

Establish a half space stratigraphic model in Figure 3, with air in the upper half and uniform formation in the lower half. The air resistivity is set at 106 Ω· m and the formation resistivity is set at 10 Ω· m. Forward calculations are performed using a frequency of 30KHz for hole spacing of 30m and 70m, and the results are shown in Figure 4. There is an analytical solution formula for calculating in a uniform space, as shown in Figure 5.

The half-space stratum model in Figure 3 is established, in which the upper part is air and the lower part is uniform stratum. The air resistivity is set to 106Ω·m, and the stratum resistivity is set to 10 Ω m. The forward calculation of the hole spacing of 30m and 70m is carried out at the frequency of 30KHz, and the results are shown in Figure 4. There is an analytical solution formula in uniform space, and the result is shown in Figure 5.