Analysis on Prospecting Effect of Integrated Electromagnetic Methods in Deep Prospecting of Fengtai Erlihe Lead−Zinc Deposit

Erlihe lead-zinc deposit is one of the representative large-middle lead-zinc deposits in Fengtai orefield. In recent years, the prospecting direction has shifted to the deep and periphery of the known ore body. According to the geological and geophysical characteristics of Erlihe area and combined with the comprehensive prospecting work in Fengtai area for many years, this paper analyzes the practical application effects of loop source transient electromagnetic method (TEM), electrical source short-offset transient electromagnetic method(SOTEM) and wide field electromagnetic method in Erlihe area. It is concluded that TEM, SOTEM and wide field electromagnetic method are feasible in deep prospecting for this area; TEM has a good effect on delineating the horizontal position of the ore body. SOTEM is more sensitive to low resistivity anomaly, the resolution of wide field electromagnetic method is high, and the detection depth can reach 2500 meters; According to the characteristics of Erlihe lead-zinc deposit, it is suggested to adopt the comprehensive electromagnetic detection method with wide field electromagnetic method and SOTEM as the first choice, and use long sections and area geophysical exploration as far as possible.