Method for determining forward line of sandstone uranium mine oxidizing zone through high-precision magnetic measurement

Abstract

The invention belongs to the field of geological exploration, in particular to a method for determining a forward line of a sandstone uranium mine oxidizing zone through high-precision magnetic measurement. The method aims at rapidly determining the forward line of the interlayer oxidizing zone type sandstone uranium mine oxidizing zone through high-precision magnetic measurement data, thereby determining the uranium mine target area position. The method comprises the steps that high-precision magnetic measurement is carried out on a uranium mine prospecting working area, and magnetic measurement data are obtained; diurnal variation correction, normal field gradient correction, height correction and base correction are conducted on the magnetic measurement data, and a magnetic anomaly delta T value of a measure point is obtained; multi-point data smoothing is conducted on the magnetic anomaly delta T value, and a magnetic anomaly delta T curve is obtained; a plane profile map is drawn by means of the magnetic anomaly delta T value; the areas where the oxidizing zone, a reducing zone and a transitional zone are located are preliminarily distinguished; the start of the transitional zone is located at the position where zero points of magnetic anomaly delta T value are connected, the terminal of the transitional zone is located at the position where turning points from the magnetic anomaly delta T value gradient zone to the smoothly-changed reducing zone are connected, and the position where the turning positions are connected is the position of the forward line of the oxidizing zone.

Description

technical field [0001] The invention belongs to the field of geological exploration, and relates to a method for determining the front line of an oxidation zone of a sandstone uranium ore by high-precision magnetic measurement, which is suitable for determining the front line of an oxidation zone in the exploration of an interlayer oxidation zone type sandstone uranium ore. Background technique [0002] The mineralization of sandstone-type uranium deposits is a kind of aqueous uranium deposit. The principle is that the groundwater brings the hexavalent uranyl ions dissolved in the groundwater in the erosion source area (that is, the oxidation zone) at the edge of the basin to the sedimentary basin. When the uranium-containing groundwater encounters When the environment is reduced, the hexavalent uranium in the groundwater is reduced to tetravalent uranium precipitation, and the precipitated area is the oxidation-reduction transition zone, that is, the area where the uranium d...

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Problems solved by technology

[0003] Some studies have pointed out that due to changes in the geochemical environment in the transition zone of the oxidation-reduction zone, magnetic minerals will demagnetize, resulting in a decrease in the magnetic field strength. This local decrease is a narrow magnetic change of about 5-20nT. Located on a gently decreasing negative background or a gradually decreasing gradient from high to low, but there is no formal above-mentioned point of view at present, and the prior art methods have not given a specific method for determining the oxidation-reduction transition zone

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