CN104615843A - Geophysical and geochemical prospecting comprehensive method for recognizing hidden volcanite-type uranium mineralization information - Google Patents

Abstract

The invention belongs to the field of uranium resource prospecting and particularly relates to a geophysical and geochemical prospecting comprehensive method for recognizing hidden volcanite-type uranium mineralization information. The method includes the following steps that firstly, the geophysical and geochemical prospecting survey is conducted; secondly, the mean value and the mean square error are calculated; thirdly, the magnetic survey data first vertical derivative is calculated, and normalization processing is conducted; fourthly, the information contrast is calculated; fifthly, indicators for geochemical prospecting are calculated; sixthly, the ore prospecting potentiality is analyzed. The method can be used for accurately recognizing the geophysical and geochemical prospecting comprehensive abnormal information relevant to deep hidden volcanite-type uranium mineralization, and a basis is provided for building the hidden volcanite-type uranium mineralization prospecting index.

Description

A kind of Geophysical-chemical integrated approach identifying Blind volcanics type uranium mineralization information

Technical field

The invention belongs to uranium resource ex-ploration field, be specifically related to a kind of Geophysical-chemical integrated approach of Blind volcanics type technique.

Background technology

Along with deepening continuously of China's uranium geology investigation and prospecting, with the buried depth more shallow uranium deposit of exposure in earth's surface is found mostly, and searching deep concealed uranium ore has become the important topic that current For Uranium Geology Work person faces.Because Blind volcanics type uranium ore buries comparatively dark, reach hundreds of rice and even go up km, the Geophysical-chemical information relevant with uranium mineralization that can detect on earth's surface is very faint or do not have.To the rift structure that volcanic type U-ore becomes ore deposit to play an important role, be the main thoroughfare that the decay daughter of the uranium such as radium, radon rises, be also the passage that deep nano-scale uranium particulate rises simultaneously.The radiation characteristics of the mainly shallow surface of the classic method reflections such as ground gamma spectrometry, can not meet the demand that URANIUM DEPOSITS IN THE DEPTH looks for ore deposit, although the investigation depth of Radon and its descendants measuring method is greater than gamma spectrometry, but owing to being comparatively vulnerable to the impact of the factor such as landforms and weather, its practical application effect also also exists multi-solution.

At metallic mineral resources exploration method, there is the deep-penetrating geochemistries such as such as geo-electrochemistry, and achieved good effect.For Blind volcanics type uranium exploration, need in conjunction with traditional measuring method and Deep-penetrating Geochemistry: technology, set up U metallogeny informix distinguishing mark more accurately.

Summary of the invention

The object of the present invention is to provide a kind of Geophysical-chemical integrated approach identifying Blind volcanics type uranium mineralization information, Blind volcanics type uranium mineralization information can be identified exactly.

Realize the technical scheme of the object of the invention: a kind of Geophysical-chemical integrated approach identifying Blind volcanics type uranium mineralization information, the method includes the steps of:

Step one, on region to be determined, carry out Geophysical-chemical data acquisition and sampling work, comprise the ground gamma spectrometry in region to be determined, Anomaly recognition transient measurement, geo-electrochemistry extract and High-accuracy ground magnetic survey;

Step 2, the gamma spectrometric uranium content to obtaining in step one, Anomaly recognition concentration and ground electric extraction uranium element content, calculate their mean value, be designated as M respectively _gU, M _rnand M _eU, meanwhile, calculate their mean square deviation, be designated as S respectively _gU, S _rnand S _eU.

Step 3, in step one obtain high-precision magnetic survey data, first carrying out pole process, then ask for vertical first order derivative DZ, DZ be normalized in [0,1] scope:

DZS _i＝(DZ _i-DZ _min)/(DZ _max-DZ _min)；

In above formula, DZS _ibe the vertical first order derivative of magnetic data after No. i-th measuring point normalization, DZ _ibe the vertical first order derivative of No. i-th measuring point, DZ _minand DZ _maxbe respectively minimum value and the maximal value of the vertical first order derivative of this survey line magnetic data.

The information contrast value of data is obtained, specifically as shown by the following formula in step 4, calculating above-mentioned steps two

The information contrast value IGU of the gamma spectrometric uranium content data of No. i-th measuring point _i:

${\mathrm{IGU}}_i=\left\{\begin{array}{cc}-0.5,& {\mathrm{GU}}_i>M_{\mathrm{GU}}+S_{\mathrm{GU}}\\ 0,& {\mathrm{GU}}_i=M_{\mathrm{GU}}+S_{\mathrm{GU}}\\ 0.5,& {\mathrm{GU}}_i<M_{\mathrm{GU}}+S_{\mathrm{GU}}\end{array}\right.$

The information contrast value IRn of the Anomaly recognition concentration data of No. i-th measuring point _i:

${\mathrm{IRn}}_i=\left\{\begin{array}{cc}1,& {\mathrm{Rn}}_i>M_{\mathrm{Rn}}+S_{\mathrm{Rn}}\\ 0,& {\mathrm{Rn}}_i=M_{\mathrm{Rn}}+S_{\mathrm{Rn}}\\ -1,& {\mathrm{Rn}}_i<M_{\mathrm{Rn}}+S_{\mathrm{Rn}}\end{array}\right.$

The ground electricity of No. i-th measuring point extracts the information contrast value IEU of uranium content data _i:

${\mathrm{IEU}}_i=\left\{\begin{array}{cc}1,& {\mathrm{EU}}_i>M_{\mathrm{EU}}+S_{\mathrm{EU}}\\ 0,& {\mathrm{EU}}_i=M_{\mathrm{EU}}+S_{\mathrm{EU}}\\ -1,& {\mathrm{EU}}_i<M_{\mathrm{EU}}+S_{\mathrm{EU}}\end{array}\right.$

Step 5, the DZS that above-mentioned steps three is obtained _iand the information contrast value IGU obtained in above-mentioned steps four _i, IRn _i, IEU _ibring following formula into, obtain the ore information index IM of No. i-th measuring point _i, be shown below:

IM _i＝DZS _i+IGU _i+IRn _i+IEU _i

Step 6, judge the ore-searching potential of the i measuring point in region to be determined.

Measuring point spacing in described step one is 20 ~ 50m.

Measuring point number in described step one is no less than 30.

Step 2 described in step 4 obtains data and refers to that gamma spectrometric uranium content, Anomaly recognition concentration and ground electricity extract the mean value M of uranium element content _gU, M _rn, M _eU, and mean square deviation S _gU, S _rnand S _eU.

For i-th measuring point in region to be determined in described step 6, if IM _ivalue is more than or equal to 1.0 these measuring points and has concealed uranium deposit ore-searching potential, if IM is less than 1.0, then this measuring point is without ore-searching potential.

Advantageous Effects of the present invention is: Advantageous Effects of the present invention is: can identify the synthetical geophysical anomalies information relevant with deep concealed volcanic type uranium mineralization exactly, provides foundation for setting up Blind volcanics type Prospecting For Uranium index.The present invention is by the basis of the Geophysical And Geochemical Methods such as ground gamma spectrometry, soil radon measurement and ground high-precision magnetic survey, calculate the average and mean square deviation etc. of various method data, and the vertical first order derivative of high-precision magnetic survey data is normalized, calculate the information contrast value of various data, and finally draw the ore information index of each measuring point, to the favourable ore-searching potential of accurate evaluation Blind volcanics type uranium ore, there is important practical significance.

Accompanying drawing explanation

Fig. 1 is the Geophysical-chemical integrated approach process flow diagram for identifying Blind volcanics type uranium mineralization information provided by the present invention.

Embodiment

Below in conjunction with drawings and Examples, the present invention is described in further detail.

A kind of Geophysical-chemical integrated approach identifying Blind volcanics type uranium mineralization information provided by the present invention, comprises the following steps:

Step one, carry out Geophysical-chemical data acquisition and sampling work in region to be determined, comprise the ground gamma spectrometry in region to be determined, Anomaly recognition transient measurement, geo-electrochemistry extraction and High-accuracy ground magnetic survey, measuring point spacing is 20 ~ 50m, and measuring point number is no less than 30;

Step 2, the gamma spectrometric uranium content to obtaining in step one, Anomaly recognition concentration and ground electric extraction uranium element content, calculate their mean value, be designated as M respectively _gU, M _rnand M _eU, meanwhile, calculate their mean square deviation, be designated as S respectively _gU, S _rnand S _eU.

Step 3, in step one obtain high-precision magnetic survey data, first carrying out pole process, then ask for vertical first order derivative DZ, DZ be normalized in [0,1] scope:

DZS _i＝(DZ _i-DZ _min)/(DZ _max-DZ _min)；

In above formula, DZS _ibe the vertical first order derivative of magnetic data after No. i-th measuring point normalization, DZ _ibe the vertical first order derivative of No. i-th measuring point, DZ _minand DZ _maxbe respectively minimum value and the maximal value of the vertical first order derivative of this survey line magnetic data.

The gamma spectrometric uranium content obtained in step 4, calculating above-mentioned steps two, Anomaly recognition concentration and ground electricity extract the mean value M of uranium element content _gU, M _rn, M _eU, and mean square deviation S _gU, S _rnand S _eUinformation contrast value, specifically as shown by the following formula:

The information contrast value IGU of the gamma spectrometric uranium content data of No. i-th measuring point _i:

${\mathrm{IGU}}_i=\left\{\begin{array}{cc}-0.5,& {\mathrm{GU}}_i>M_{\mathrm{GU}}+S_{\mathrm{GU}}\\ 0,& {\mathrm{GU}}_i=M_{\mathrm{GU}}+S_{\mathrm{GU}}\\ 0.5,& {\mathrm{GU}}_i<M_{\mathrm{GU}}+S_{\mathrm{GU}}\end{array}\right.$

The information contrast value IRn of the Anomaly recognition concentration data of No. i-th measuring point _i:

${\mathrm{IRn}}_i=\left\{\begin{array}{cc}1,& {\mathrm{Rn}}_i>M_{\mathrm{Rn}}+S_{\mathrm{Rn}}\\ 0,& {\mathrm{Rn}}_i=M_{\mathrm{Rn}}+S_{\mathrm{Rn}}\\ -1,& {\mathrm{Rn}}_i<M_{\mathrm{Rn}}+S_{\mathrm{Rn}}\end{array}\right.$

The ground electricity of No. i-th measuring point extracts the information contrast value IEU of uranium content data _i:

${\mathrm{IEU}}_i=\left\{\begin{array}{cc}1,& {\mathrm{EU}}_i>M_{\mathrm{EU}}+S_{\mathrm{EU}}\\ 0,& {\mathrm{EU}}_i=M_{\mathrm{EU}}+S_{\mathrm{EU}}\\ -1,& {\mathrm{EU}}_i<M_{\mathrm{EU}}+S_{\mathrm{EU}}\end{array}\right.$

Step 5, the DZS that above-mentioned steps three is obtained _iand the information contrast value IGU obtained in above-mentioned steps four _i, IRn _i, IEU _ibring following formula into, obtain the ore information index IM of No. i-th measuring point _ibe shown below:

IM _i＝DZS _i+IGU _i+IRn _i+IEU _i；

Step 6, judge the ore-searching potential of the i measuring point in region to be determined, for i measuring point, if IM _ivalue is greater than 3.0 these measuring points and has very high concealed uranium deposit ore-searching potential; If 2.0≤IM _i<3.0, then this measuring point has higher ore-searching potential; If 1.0≤IM _i<2.0, then this measuring point has general ore-searching potential, if IM _i<1.0, then this measuring point is without ore-searching potential.

In conjunction with the accompanying drawings and embodiments the present invention is explained in detail above, but the present invention is not limited to above-described embodiment, in the ken that those of ordinary skill in the art possess, various change can also be made under the prerequisite not departing from present inventive concept.The content be not described in detail in the present invention all can adopt prior art.

Claims (5)

1. identify a Geophysical-chemical integrated approach for Blind volcanics type uranium mineralization information, its feature exists: the method includes the steps of:

Step one, on region to be determined, carry out Geophysical-chemical data acquisition and sampling work, comprise the ground gamma spectrometry in region to be determined, Anomaly recognition transient measurement, geo-electrochemistry extract and High-accuracy ground magnetic survey;

Step 2, the gamma spectrometric uranium content to obtaining in step one, Anomaly recognition concentration and ground electric extraction uranium element content, calculate their mean value, be designated as M respectively _gU, M _rnand M _eU, meanwhile, calculate their mean square deviation, be designated as S respectively _gU, S _rnand S _eU.

Step 3, in step one obtain high-precision magnetic survey data, first carrying out pole process, then ask for vertical first order derivative DZ, DZ be normalized in [0,1] scope:

DZS _i＝(DZ _i-DZ _min)/(DZ _max-DZ _min)；

In above formula, DZS _ibe the vertical first order derivative of magnetic data after No. i-th measuring point normalization, DZ _ibe the vertical first order derivative of No. i-th measuring point, DZ _minand DZ _maxbe respectively minimum value and the maximal value of the vertical first order derivative of this survey line magnetic data.

The information contrast value of data is obtained, specifically as shown by the following formula in step 4, calculating above-mentioned steps two

The information contrast value IGU of the gamma spectrometric uranium content data of No. i-th measuring point _i:

${\mathrm{IGU}}_i=\left\{\begin{array}{cc}-0.5,& {\mathrm{GU}}_i>M_{\mathrm{GU}}+S_{\mathrm{GU}}\\ 0,& {\mathrm{GU}}_i=M_{\mathrm{GU}}+S_{\mathrm{GU}}\\ 0.5,& {\mathrm{GU}}_i<M_{\mathrm{GU}}+S_{\mathrm{GU}}\end{array}\right.$

The information contrast value IRn of the Anomaly recognition concentration data of No. i-th measuring point _i:

${\mathrm{IRn}}_i=\left\{\begin{array}{cc}1,& {\mathrm{Rn}}_i>M_{\mathrm{Rn}}+S_{\mathrm{Rn}}\\ 0,& {\mathrm{Rn}}_i=M_{\mathrm{Rn}}+S_{\mathrm{Rn}}\\ -1,& {\mathrm{Rn}}_i<M_{\mathrm{Rn}}+S_{\mathrm{Rn}}\end{array}\right.$

The ground electricity of No. i-th measuring point extracts the information contrast value IEU of uranium content data _i:

${\mathrm{IEU}}_i=\left\{\begin{array}{cc}1,& {\mathrm{EU}}_i>M_{\mathrm{EU}}+S_{\mathrm{EU}}\\ 0,& {\mathrm{EU}}_i=M_{\mathrm{EU}}+S_{\mathrm{EU}}\\ -1,& {\mathrm{EU}}_i<M_{\mathrm{EU}}+S_{\mathrm{EU}}\end{array}\right.$

Step 5, the DZS that above-mentioned steps three is obtained _iand the information contrast value IGU obtained in above-mentioned steps four _i, IRn _i, IEU _ibring following formula into, obtain the ore information index IM of No. i-th measuring point _i, be shown below:

IM _i＝DZS _i+IGU _i+IRn _i+IEU _i

Step 6, judge the ore-searching potential of the i measuring point in region to be determined.

2. a kind of Geophysical-chemical integrated approach identifying Blind volcanics type uranium mineralization information according to claim 1, is characterized in that: the measuring point spacing in described step one is 20 ~ 50m.

3. a kind of Geophysical-chemical integrated approach identifying Blind volcanics type uranium mineralization information according to claim 2, is characterized in that: the measuring point number in described step one is no less than 30.

4. a kind of Geophysical-chemical integrated approach identifying Blind volcanics type uranium mineralization information according to any one of claim 1 to 3, is characterized in that: the step 2 described in step 4 obtains data and refers to that gamma spectrometric uranium content, Anomaly recognition concentration and ground electricity extract the mean value M of uranium element content _gU, M _rn, M _eU, and mean square deviation S _gU, S _rnand S _eU.

5. a kind of Geophysical-chemical integrated approach identifying Blind volcanics type uranium mineralization information according to claim 4, is characterized in that: for i-th measuring point in region to be determined in described step 6, if IM _ivalue is more than or equal to 1.0 these measuring points and has concealed uranium deposit ore-searching potential, if IM is less than 1.0, then this measuring point is without ore-searching potential.