Abstract:

Angle-domain is the basic unit to describe rugged terrain. Apparent resistivity anomaly of complicated terrain can be drawn using the method of angle domain overlapping and then the topographic correction can be performed. We superpose the distorted apparent resistivity of the simple angle-domain terrain to get the distorted apparent resistivity of complicated angle-domain terrain. The method analyses the error of combination and superposition. It’s also compared with the result of ANSYS modeling. It’s proved that the apparent resistivity anomaly of complicated angle-domain terrain can be gained by combination and superposition when the terrain does not vary greatly. And finally we show some examples in which the topographic effect  is obtained  by the method of angle domain overlapping,and the topographic correction is conducted in terms of the terrain correction formulation. The comparison with the result of horizontal terrain shows that the comparison method can weaken the topographic influence，and extrude the anomaly of the local geological body.

Key words: electrical prospecting, topographic correction, analytical solution, ANSYS