1. A method for delineating a uranium mineralization favorable area based on a radon-active uranium comprehensive index is characterized by comprising the following steps: the method comprises the following steps:

step (1), soil radon gas measurement and soil metal activity state measurement work with the same scale and the same point are carried out in a uranium mine exploration area; step (2), acquiring a soil radon concentration value and an active uranium content value at a measuring point; step (3), calculating a normalized comprehensive investigation parameter according to the soil radon concentration value and the active uranium content value; step (4), carrying out interpolation and low-pass filtering on the normalized comprehensive exploration parameters to obtain radon-active uranium comprehensive exploration uranium ore favorable indexes; and (5) according to the radon-active uranium comprehensive exploration uranium ore favorable index and the uranium ore favorable classification principle, defining the uranium ore favorable areas of different grades.

2. The method for delineating uranium mineralization favored zones based on a radon-active uranium composite index as claimed in claim 1, wherein: in the step (1), a uranium ore exploration area A (U) is determined, and soil radon gas measurement work and soil metal activity state measurement work with a measuring net of 20 meters multiplied by 20 meters are developed in the uranium ore exploration area A (U).

3. The method for delineating uranium mineralization favored zones based on a radon-active uranium composite index as claimed in claim 2, wherein: the soil radon gas measurement work adopts an active carbon adsorption radon gas measurement mode, three pits with the depth of 50cm are dug in a circle with the measuring point as the center and the radius of 2 m, active carbon samplers are embedded in the pits, the embedding time is unified to 7 days, and radon concentration values measured by the active carbon samplers in the three pits are measured.

4. The method for delineating uranium mineralization favored zones based on a radon-active uranium composite index as claimed in claim 3, wherein: the soil metal activity state measurement work is carried out, the measurement point position coincides with the soil radon gas measurement position, 1 soil sample of a shallow earth surface cementing layer is collected at the measurement point, the soil sample is aired and sieved to minus 250 meshes, the mass of the sample after being sieved is not less than 50 grams, samples of an adsorption binding state and a ferric manganese oxide binding state are extracted, and the content of uranium in 2 phase samples is tested by adopting an ICP-MS method.

5. The method for delineating uranium mineralization favored zones based on a radon-active uranium composite index as claimed in claim 3, wherein: in the step (2), the average value of the radon concentration measured by the active carbon samplers in the three pits is taken as the final radon concentration value C of the measuring point_Rn(O)。

6. The method for delineating uranium mineralization favored zones based on a radon-active uranium composite index as claimed in claim 4, wherein: in the step (2), the value obtained by adding 2 uranium content values is used as the original soil metal active uranium content value C_U(O)。

7. The method for delineating uranium mineralization favored zones based on a radon-active uranium composite index as claimed in claim 5 or 6, wherein: the step (3) specifically comprises the following steps:

calculating normalized soil radon concentration value C_Rn(N); calculating normalized soil metal active state uranium content value C_U(N); calculating a comprehensive survey parameter P (O); and calculating a normalized comprehensive survey parameter P (N).

8. The method for delineating a uranium mineralization favored zone based on a radon-active uranium composite index as claimed in claim 7, wherein: the normalized soil radon concentrationValue C_Rn(N)：

In the formula (I), the compound is shown in the specification,

C_Rn(Min) represents the minimum of the original soil radon concentration values;

C_Rn(Max) represents the maximum value of the original soil radon concentration values.

9. The method for delineating uranium mineralization favored zones based on a radon-active uranium composite index as claimed in claim 8, wherein: the normalized soil metal active uranium content value C_U(N)：

In the formula (I), the compound is shown in the specification,

C_U(Min) represents the minimum of the values of the active uranium content of the original soil metal;

C_U(Max) represents the maximum value in the values of the active uranium content of the original soil metal.

10. The method for delineating a uranium mineralization favored zone based on a radon-active uranium composite index as claimed in claim 9, wherein: the comprehensive survey parameter P (O):

11. the method for delineating a uranium mineralization favored zone based on a radon-active uranium composite index as claimed in claim 10, wherein: the normalized integrated survey parameters p (n):

in the formula (I), the compound is shown in the specification,

p (Min) represents the minimum of the values of P (O);

p (Max) represents the maximum value of the P (O) values.

12. The method for delineating a uranium mineralization favored zone based on a radon-active uranium composite index as claimed in claim 11, wherein: in the step (4), the method comprises the following steps:

carrying out gridding interpolation on P (N) values of all measuring points in a uranium mine exploration area A (U), and obtaining a gridding value P (I) of each measuring point by adopting a Radial Basis Functions interpolation method; and (4) carrying out low-pass filtering treatment on the value P (I) to obtain the radon-active uranium comprehensive exploration uranium ore favorable index P (L) of each measurement mesh point.

13. The method for delineating a uranium mineralization favored zone based on a radon-active uranium composite index as claimed in claim 12, wherein: in the step (5), the step (c),

according to the value of P (L), the area which encloses P (L) to be more than or equal to 0.85 is a first-grade uranium mineralization advantageous area A_U(1) (ii) a The area with the delineation of 0.85 more than P (L) more than or equal to 0.75 is a secondary uranium mineralization favorable area A_U(2) (ii) a The area with the delineation of 0.75 and more than P (L) and more than or equal to 0.65 is a three-level uranium mineralization favorable area A_U(3)。

Background

Uranium resources are national strategic resources for military and civil use, the quantity of uranium resources discovered at present in China cannot guarantee the national requirements for military and civil use, and most of uranium resources still depend on imports. In order to guarantee the supply of uranium resources in China, the domestic uranium ore resource exploration work needs to be greatly promoted. Because the superficial uranium ore in China is completely explored, the emphasis of uranium ore exploration is shifted to deep blind uranium ore at present. Because the ore body of the deep concealed uranium mine is buried deeply, the information related to uranium mineralization generated on the ground surface is weak, the information which effectively reflects the occurrence position of the uranium ore body is difficult to accurately capture by adopting the conventional radioactive exploration or geochemical exploration method, the ore-finding rate in the defined favorable region of the uranium mineralization is low, the deep uranium mine exploration effect is poor, the exploration efficiency is low, and the economic cost is high. Under the condition that investment of national uranium mine exploration cost is limited, the amount of uranium resources found through exploration work cannot guarantee the national demand. Therefore, in order to accurately define occurrence positions of deep uranium ore bodies and improve the success rate of ore exploration and finding of deep uranium ore, effective deep uranium ore formation information needs to be acquired through a suitable physical and chemical exploration combination method and a corresponding data processing technology.

In order to guide the delineation of beneficial areas of uranium mineralization, a key physical prospecting combination method, a corresponding data processing technology and an index reflecting the profitability of uranium mineralization are key problems to be solved urgently by technical personnel in the field.

Disclosure of Invention

The invention aims to provide a method for delineating a beneficial uranium mineralization area based on a radon-active uranium comprehensive index, which can accurately delineate the beneficial uranium mineralization area.

The technical scheme adopted by the invention is as follows:

a method for delineating uranium mineralization favorable area based on radon-active uranium comprehensive index comprises the following steps:

step 1, performing soil radon gas measurement and soil metal activity state measurement with the same scale and the same position in a uranium mine exploration area; step 2, acquiring a soil radon concentration value and an active uranium content value at a measuring point; step 3, calculating a normalized comprehensive investigation parameter according to the soil radon concentration value and the active uranium content value; step 4, carrying out interpolation and low-pass filtering on the normalized comprehensive exploration parameters to obtain radon-active uranium comprehensive exploration uranium ore favorable indexes; and 5, according to the radon-active uranium comprehensive exploration uranium ore favorable indexes and the uranium ore favorable classification principle, delimiting the uranium ore favorable areas of different levels.

In the step 1, a uranium ore exploration area A (U) is determined, and soil radon gas measurement work and soil metal activity state measurement work with a measuring net of 20 meters multiplied by 20 meters are developed in the uranium ore exploration area A (U).

The soil radon gas measurement work adopts an active carbon adsorption radon gas measurement mode, three pits with the depth of 50cm are dug in a circle with the measuring point as the center and the radius of 2 m, active carbon samplers are embedded in the pits, the embedding time is unified to 7 days, and radon concentration values measured by the active carbon samplers in the three pits are measured.

The soil metal activity state measurement work is carried out, the measurement point position coincides with the soil radon gas measurement position, 1 soil sample of a shallow earth surface cementing layer is collected at the measurement point, the soil sample is aired and sieved to minus 250 meshes, the mass of the sample after being sieved is not less than 50 grams, samples of an adsorption binding state and a ferric manganese oxide binding state are extracted, and the content of uranium in 2 phase samples is tested by adopting an ICP-MS method.

In the step 2, the average value of the radon concentration measured by the active carbon samplers in the three pits is taken as the final radon concentration value C of the measuring point_Rn(O)。

In the step 2, the value obtained by adding 2 uranium content values is used as the original soil metal active uranium content value C_U(O)。

The step 3 specifically comprises the following steps:

calculating normalized soil radon concentration value C_Rn(N); calculating normalized soil metal active state uranium content value C_U(N); calculating a comprehensive survey parameter P (O); and calculating a normalized comprehensive survey parameter P (N).

The normalized soil radon concentration value C_Rn(N)：

In the formula (I), the compound is shown in the specification,

C_Rn(Min) represents the minimum of the original soil radon concentration values;

C_Rn(Max) represents the maximum value of the original soil radon concentration values.

The normalized soil metal active uranium content value C_U(N)：

In the formula (I), the compound is shown in the specification,

C_U(Min) represents the minimum of the values of the active uranium content of the original soil metal;

C_U(Max) represents the maximum value in the values of the active uranium content of the original soil metal.

The comprehensive survey parameter P (O):

the normalized integrated survey parameters p (n):

in the formula (I), the compound is shown in the specification,

p (Min) represents the minimum of the values of P (O);

p (Max) represents the maximum value of the P (O) values.

The step 4 comprises the following steps:

carrying out gridding interpolation on P (N) values of all measuring points in a uranium mine exploration area A (U), and obtaining a gridding value P (I) of each measuring point by adopting a Radial Basis Functions interpolation method; and (4) carrying out low-pass filtering treatment on the value P (I) to obtain the radon-active uranium comprehensive exploration uranium ore favorable index P (L) of each measurement mesh point.

In the step 5, the step of processing the image,

according to the value of P (L), the area which encloses P (L) to be more than or equal to 0.85 is a first-grade uranium mineralization advantageous area A_U(1) (ii) a The area with the delineation of 0.85 more than P (L) more than or equal to 0.75 is a secondary uranium mineralization favorable area A_U(2) (ii) a The area with the delineation of 0.75 and more than P (L) and more than or equal to 0.65 is a three-level uranium mineralization favorable area A_U(3)。

Compared with the prior art, the invention has the beneficial effects that:

(1) the method for delineating the beneficial region of uranium mineralization based on the radon-active uranium comprehensive index provides an efficient and reliable physicochemical exploration technical means for exploring concealed uranium ores in China.

(2) The method for delineating the beneficial region of the uranium ore based on the radon-active uranium comprehensive index can accurately delineate the beneficial range of the blind uranium ore.

(3) In the beneficial range of the ore formation, the probability of finding the uranium ore through drilling work is higher, so that the uranium ore exploration efficiency is effectively improved, the uranium ore exploration cost is reduced, and the uranium ore exploration benefit is improved.

(4) According to the method for delineating the beneficial region of the uranium mineralization based on the radon-active uranium comprehensive index, the blind uranium ore body can be rapidly and more extensively investigated under the condition that the same uranium ore exploration expenditure is invested in the country, and the national uranium resource supply is effectively guaranteed.

Drawings

FIG. 1 is a flow chart of a method for delineating a beneficial uranium mineralization area based on a radon-active uranium comprehensive index provided by the invention;

fig. 2 is a flow chart of another method for delineating a beneficial uranium mineralization area based on a radon-active uranium comprehensive index provided by the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

As shown in fig. 1, the method for delineating a uranium mineralization favorable area based on a radon-active uranium comprehensive index provided by the invention comprises the following steps:

step 1, performing soil radon gas measurement and soil metal activity state measurement with the same scale and the same position in a uranium mine exploration area; step 2, acquiring a soil radon concentration value and an active uranium content value at a measuring point; step 3, calculating a radon-active uranium comprehensive exploration uranium mineralization favorable index value according to the soil radon concentration value and the active uranium content value; step 4, interpolation and low-pass filtering are carried out on the uranium mineralization favorable index; and 5, enclosing the beneficial uranium ore regions of different grades according to the interpolation and filtering results and the classification principle of the beneficial uranium ore regions.

Example 2

The method for delineating the uranium mineralization favorable area based on the radon-active uranium comprehensive index comprises the following steps: firstly, soil radon gas measurement and soil metal activity state measurement with the same scale and the same position are carried out in a uranium mine exploration area A (U), and an original soil radon concentration value C at the measurement position is respectively obtained_Rn(O) and original soil metal active uranium content value C_U(O); then, for C_Rn(O)、C_U(O) carrying out normalization treatment to respectively obtain normalized soil radon concentration values C_Rn(N) and normalized soil metal active uranium content value C_U(N); then, calculating a comprehensive survey parameter P (O); then, carrying out normalization processing on P (O) to obtain a normalized comprehensive survey parameter P (N); then, carrying out gridding interpolation on all measuring points P (N) in the uranium mine exploration area A (U) to obtain a gridding value P (I) at each measuring point; then, carrying out low-pass filtering on the P (I) and the P (I) to obtain a low-pass filtering value at each measuring point, namely the radon-active uranium comprehensive exploration uranium ore favorable index P (L); finally, 3 grades of uranium mineralization favorable areas A are defined according to the P (L) value_U(1)、A_U(2) And A_U(3)。

Example 3

The method for delineating the uranium mineralization favorable area based on the radon-active uranium comprehensive index comprises the following steps:

step 1, determining a uranium mine exploration area A (U)

Step 2, acquiring an original soil radon concentration value C_Rn(O)

The method comprises the steps of carrying out soil radon gas measurement work with a measuring net of 20 meters multiplied by 20 meters in a uranium mine exploration area A (U), adopting an active carbon adsorption radon gas measurement mode, digging three pits with the depth of 50cm in a circle with a measuring point as a center and the radius of 2 meters, embedding active carbon samplers in the pits, unifying the embedding time for 7 days, and taking the average value of radon concentrations measured by the active carbon samplers in the three pits as a final radon concentration value C of the measuring point_Rn(O)。

Step 3, obtaining the original soil metal active uranium content value C_U(O)

The soil metal activity state measurement work with the measurement net of 20 meters multiplied by 20 meters is carried out in the uranium mine exploration area A (U), and the measurement is carried outThe measuring point position coincides with the soil radon gas measuring position, 1 soil sample of a shallow earth surface cementing layer is collected at the measuring point position, the soil sample is aired and sieved to minus 250 meshes, the mass of the sample after being sieved is not less than 50 grams, samples of an adsorption binding state and a ferric manganese oxide binding state are extracted, the uranium content in 2 phase samples is tested by adopting an ICP-MS method, and the value obtained by adding 2 uranium content values is used as an original soil metal active state uranium content value C_U(O)。

Step 4, calculating a normalized soil radon concentration value C_Rn(N)

Calculating the normalized soil radon concentration value C by using the following formula_Rn(N)：

In the formula (I), the compound is shown in the specification,

C_Rn(Min) represents the minimum of the original soil radon concentration values;

C_Rn(Max) represents the maximum value of the original soil radon concentration values.

Step 5, calculating the normalized soil metal active uranium content value C_U(N)

Calculating the normalized soil metal active uranium content value C by using the following formula_U(N)：

In the formula (I), the compound is shown in the specification,

C_U(Min) represents the minimum of the values of the active uranium content of the original soil metal;

C_U(Max) represents the maximum value in the values of the active uranium content of the original soil metal.

Step 6, calculating comprehensive survey parameters P (O)

The comprehensive survey parameter p (o) is calculated using the formula:

step 7, calculating a normalized comprehensive survey parameter P (N)

The normalized comprehensive survey parameter p (n) is calculated using the formula:

in the formula (I), the compound is shown in the specification,

p (Min) represents the minimum of the values of P (O);

p (Max) represents the maximum value of the P (O) values.

Step 8, acquiring gridding values P (I) of each measuring point

And carrying out gridding interpolation on the P (N) value of each measuring point in the uranium mine exploration area A (U), and obtaining the gridding value P (I) of each measuring point by adopting a Radial Basis Functions interpolation method and the screen degree after interpolation is 2 m multiplied by 2 m.

Step 9, acquiring radon-active uranium comprehensive exploration uranium ore favorable index P (L)

And (4) carrying out low-pass filtering treatment on the value P (I) to obtain the radon-active uranium comprehensive exploration uranium ore favorable index P (L) of each measurement mesh point.

Step 10, demarcating beneficial areas A of 3 grades of uranium mineralization_U(1)、A_U(2) And A_U(3)

According to the value of P (L), the area which encloses P (L) to be more than or equal to 0.85 is a first-grade uranium mineralization advantageous area A_U(1) (ii) a The area with the delineation of 0.85 more than P (L) more than or equal to 0.75 is a secondary uranium mineralization favorable area A_U(2) (ii) a The area with the delineation of 0.75 and more than P (L) and more than or equal to 0.65 is a three-level uranium mineralization favorable area A_U(3)。

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.