A METHOD FOR POSITIONING SEDIMENTARY BAUXITE ORE

摘要

#$%^&*AU2020102186A420201015.pdf#####Abstract A method for positioning a sedimentary bauxite ore relates to the field of metallic and geophysical exploration, and aims to solve the problem that only a single existing bauxite ore survey method can be used, causing the survey results not accurate enough. The method comprises: determining an upper interface of Ordovician limestone and a position of a depressed area of the Ordovician limestone in the horizontal direction by using a transient electromagnetic method in a zone to be estimated; determining a position of the depressed area of the Ordovician limestone in the vertical direction by using a seismic survey method in the zone to be estimated; By integrating survey data of the transient electromagnetic method and survey data of the seismic survey method, a position where the subsidence area on the top surface of the Ordovician limestone occurs in both the horizontal and vertical directions is determined as a bauxite ore occurrence position. The present disclosure determines uneven abnormal positions in the horizontal direction and the vertical direction, respectively, by using the transient electromagnetic method and the seismic survey method, and comprehensively analyzes the transient electromagnetic and seismic survey profiles, so as to accurately position the bauxite ore.Carrying out survey by using a transient electromagnetic sounding method in a zone to be estimated to obtain a transient electromagnetic apparent resistivity profile; estimating lateral S1 unevenness of an ore-bearing area on the apparent resistivity profile by using the electrical differences between the bauxite ore and surrounding rocks; and delineating a depressed area on the top surface of the Ordovician limestone in the horizontal direction Carrying out survey by using a seismic survey method in the zone to be estimated to obtain a 2 seismic survey profile; inferring the burial depth and undulation characteristics of the upper interface of the basement limestone of the aluminum-bearing rock, and delineating a depressed area on the top surface ofthe Ordovician limestone in the vertical direction; Integrating the transient electromagnetic profile and the seismic survey profile, to determine a S3 position where the depressed area on top surface of the Ordovician limestone occurs in both the horizontal and vertical directions as a bauxite ore occurrence position. Fig. 1