CN106842333A - A kind of space-location method of interlayer oxidation zone sandstone-type uranium Favourable Target Areas - Google Patents
A kind of space-location method of interlayer oxidation zone sandstone-type uranium Favourable Target Areas Download PDFInfo
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- CN106842333A CN106842333A CN201510883521.0A CN201510883521A CN106842333A CN 106842333 A CN106842333 A CN 106842333A CN 201510883521 A CN201510883521 A CN 201510883521A CN 106842333 A CN106842333 A CN 106842333A
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Abstract
The invention belongs to Uranium Exploration and geophysical probing technique field, and in particular to a kind of space-location method of interlayer oxidation zone sandstone-type uranium Favourable Target Areas.The present invention is comprised the following steps：Beneficial Ore-forming location is determined by magnetotelluric sounding method in major tasks area；For Beneficial Ore-forming location, Redox transitional zone scope is drawn a circle to approve by ground high accuracy magnetic method surface sweeping；Delineate the preceding forward line of redox zone；Preliminary delineation Beneficial Ore-forming area, development electromagnetic measurement carries out sand body and finely recognizes, target sand body is drawn a circle to approve with from longitudinal direction；According to from face draw a circle to approve Redox transitional zone scope, and target sand body genesis analysis, draw a circle to approve into ore deposit Favourable Target Areas.The present invention solves the technical problem that prior art is difficult to carry out uranium ore exact space positioning, with reference to Redox transitional zone scope and target sand body genesis analysis, the exact space positioning to interlayer oxidation zone sandstone-type uranium can be realized, significant are worked to Prospecting Sandstone-type Uranium Deposits.
Description
Technical field
The invention belongs to Uranium Exploration and geophysical probing technique field, and in particular to a kind of interlayer
The space-location method of oxidized zone sandstone-type uranium mineralization with respect Favourable Target Areas.
Background technology
The uranium being formed as in rock of sandstone-type uranium mineralization with respect is activated and leached by oxygen-containing artesian water, with underground
Water is migrated along sand layers in basin, when rich uranium underground water runs into also in along sand layers to transition process in basin
During former environment, uranyl complex is decomposed, and hexavalent uranium is reduced into uranous precipitation enrichment.Therefore, uranium ore
The spatial distribution for changing band is strictly controlled by interlayer oxidized zone pinch position (i.e. Redox transitional zone).
Uranium ore does not possess density, magnetic, electrical etc. abnormal in addition to significant radioactive anomaly feature
Characteristic.In URANIUM DEPOSITS IN THE DEPTH detection, Radiometric Exploration produces little effect, and uses conventional earth physical means
Also direct detection cannot be carried out to uranium ore.
The content of the invention
The technical problem to be solved in the invention is：Prior art is difficult to interlayer oxidation zone sandstone-type uranium
Carry out exact space positioning.
Technical scheme is as described below：
A kind of space-location method of interlayer oxidation zone sandstone-type uranium Favourable Target Areas, comprises the following steps：
Step 1. determines Beneficial Ore-forming location：Determined by magnetotelluric sounding method in major tasks area favourable
Into ore deposit location；
Step 2. draws a circle to approve Redox transitional zone scope：For Beneficial Ore-forming location, by ground in high precision
Redox transitional zone scope is drawn a circle to approve in magnetic method surface sweeping；
Step 3. delineates the preceding forward line of redox zone；
Step 4. draws a circle to approve into ore deposit Favourable Target Areas：By step 1 to step 3 tentatively delineation Beneficial Ore-forming area,
And carry out dot away from electromagnetic measurement, and carry out sand body and finely recognize, target sand body is enclosed with from longitudinal direction
It is fixed；According to from face draw a circle to approve Redox transitional zone scope, and target sand body genesis analysis, circle
Determine into ore deposit Favourable Target Areas, realize the space orientation to interlayer oxidation zone sandstone-type uranium.
Preferably：In step 1, determining the index in Beneficial Ore-forming location includes：There is structure in basin edge
Slope belt is made, occurrence is less than 20 °；Sand and mud interstratification structure is good, with more than 2 layers sand bodies；Individual layer sand body
Thickness is more than 20 meters；Lithology mutually diminishes, transverse resistivity change stabilization.
Preferably：In step 2, the index for drawing a circle to approve Redox transitional zone scope includes：It is overall
Magnetic field smooth change；With " recessed pocket " shape magnetic anomaly, magnetic anomaly amplitude is less than 50nT.
Preferably：In step 3, for step 2 draw a circle to approve Redox transitional zone scope,
" recessed pocket " shape magnetic field uprises the maximum local line of region slopes, the as preceding forward line of redox zone by low
Position.
Preferably：In step 1, the measurement point that development magnetotelluric sounding method is explored is away from small
In equal to 200m.
Preferably：In step 1, the magnetotelluric sounding method determines data acquisition according to following formula
Cycle：
In formula,
T is data collection cycle；
ρ is stratum background resistivity；
P is depth of exploration.
Preferably：In step 2, the specific standards of the global magnetic field smooth change are cutd open for magnetic survey
Upper thread away from less than or equal to 200 meters, point away from less than or equal to 20 meters.
Beneficial effects of the present invention are：
Using a kind of space-location method of interlayer oxidation zone sandstone-type uranium Favourable Target Areas of the invention, root
Redox transitional zone distribution is drawn a circle to approve from face according to magnetic signature, is determined to contain ore deposit according to electrical property difference
The genesis analysis of target sand body, with reference to the Redox transitional zone scope and target sand body drawn a circle to approve from face
Genesis analysis, can realize to the exact space of interlayer oxidation zone sandstone-type uranium positioning, to sandrock-type
Prospecting For Uranium work has important practical significance.
Brief description of the drawings
Fig. 1 is a kind of space-location method stream of interlayer oxidation zone sandstone-type uranium Favourable Target Areas of the invention
Cheng Tu.
Specific embodiment
With reference to the accompanying drawings and examples to a kind of interlayer oxidation zone sandstone-type uranium Favourable Target Areas of the invention
Space-location method be described in detail.
According to sandstone-type uranium deposit process, the precipitation enrichment of uranium mainly there occurs redox reaction, make
Obtain hexavalent uranium and be reduced into uranous.At the same time, contained ferromagnetic mineral also there occurs oxidation in stratum
Reduction reaction, in Redox transitional zone, ferric iron is progressively reduced into divalence iron oxide, divalent oxygen
Change iron to be combined into magnetic iron ore with bloodstone again or form magnetic iron ore etc. through sulfurization, so that oxidation is also
Overall magnetic enhancement in former intermediate zone.In addition, the preservation carrier of sandstone-type uranium mineralization with respect is medium-fine sand rock, heavy
In product basin, sandstone and mud stone have certain electrical property difference, and area can be carried out to sand shale from electrical angle
Point.
Therefore, Redox transitional zone distribution can be drawn a circle to approve from face according to magnetic signature, and from electricity
Property angle can disclose the genesis analysis of the sand body of target containing ore deposit, so as to realize to interlayer oxidation zone sandstone-type uranium
Space orientation.
As shown in figure 1, a kind of space orientation of interlayer oxidation zone sandstone-type uranium Favourable Target Areas of the invention
Method is comprised the following steps：
Step 1. determines Beneficial Ore-forming location
Beneficial Ore-forming location is determined by magnetotelluric sounding method in major tasks area.
Wherein it is determined that the index in Beneficial Ore-forming location includes：There is structural slope, preferably occurrence in basin edge
Less than 20 °；Sand and mud interstratification structure is good, preferably with more than 2 layers sand bodies；Individual layer sand thickness is more than 20
Rice；Lithology mutually diminishes, transverse resistivity change stabilization.
In the present embodiment, carry out the measurement point explored of magnetotelluric sounding method away from less than or equal to 200m,
Key sections measurement point determines data collection cycle size away from less than or equal to 50m according to following formula：
In formula,
T is data collection cycle；
ρ is stratum background resistivity；
P is depth of exploration.
In the present embodiment, can be calculated as the inverting of telluric electromagnetic sounding data using regularization two dimensional inversion
Method, the position of the mesh generation requirement measuring point of initial model is located at the center of rectangular element in the horizontal direction,
And ensure that the change of the width and height of adjacent cells is less than 3~5 times, while model should expand downwards with both sides
Open up to 6~8 maximum skin depths.
Step 2. draws a circle to approve Redox transitional zone scope
For the Beneficial Ore-forming location that step 1 determines, by ground high accuracy magnetic method surface sweeping, to draw a circle to approve oxygen
Change reduction intermediate zone scope.
Wherein, the index of delineation Redox transitional zone scope includes：Global magnetic field smooth change, does not have
Big ups and downs；With " recessed pocket " shape magnetic anomaly, magnetic anomaly amplitude is less than 50nT.
In the present embodiment, the specific standards of the global magnetic field smooth change for magnetic survey hatching away from less than etc.
In 200 meters, point away from less than or equal to 20 meters.
Step 3. delineates the preceding forward line of redox zone
For the Redox transitional zone scope that step 2 is drawn a circle to approve, area is uprised by low in " recessed pocket " shape magnetic field
The local line of domain maximum slope, as redox zone forward line position.
Step 4. draws a circle to approve into ore deposit Favourable Target Areas
By step 1 to step 3 tentatively delineation Beneficial Ore-forming area, and carry on dot away from electromagnetism survey
Amount, carries out sand body and finely recognizes, target sand body is drawn a circle to approve with from longitudinal direction；Drawn a circle to approve according to from face
Redox transitional zone scope, and target sand body genesis analysis, it is public according to those skilled in the art
Ore deposit Favourable Target Areas are drawn a circle to approve into by knowing general knowledge, the space orientation to interlayer oxidation zone sandstone-type uranium is realized.
Claims (7)
1. a kind of space-location method of interlayer oxidation zone sandstone-type uranium Favourable Target Areas, it is characterised in that：
Comprise the following steps：
Step 1. determines Beneficial Ore-forming location：Determined by magnetotelluric sounding method in major tasks area favourable
Into ore deposit location；
Step 2. draws a circle to approve Redox transitional zone scope：For Beneficial Ore-forming location, by ground in high precision
Redox transitional zone scope is drawn a circle to approve in magnetic method surface sweeping；
Step 3. delineates the preceding forward line of redox zone；
Step 4. draws a circle to approve into ore deposit Favourable Target Areas：By step 1 to step 3 tentatively delineation Beneficial Ore-forming area,
And carry out dot away from electromagnetic measurement, and carry out sand body and finely recognize, target sand body is enclosed with from longitudinal direction
It is fixed；According to from face draw a circle to approve Redox transitional zone scope, and target sand body genesis analysis, circle
Determine into ore deposit Favourable Target Areas, realize the space orientation to interlayer oxidation zone sandstone-type uranium.
2. a kind of space of interlayer oxidation zone sandstone-type uranium Favourable Target Areas according to claim 1 is determined
Position method, it is characterised in that：In step 1, determining the index in Beneficial Ore-forming location includes：Basin edge is present
Structural slope, occurrence is less than 20 °；Sand and mud interstratification structure is good, with more than 2 layers sand bodies；Individual layer sand
Body thickness is more than 20 meters；Lithology mutually diminishes, transverse resistivity change stabilization.
3. the sky of a kind of interlayer oxidation zone sandstone-type uranium Favourable Target Areas according to claim 1 and 2
Between localization method, it is characterised in that：In step 2, the index for drawing a circle to approve Redox transitional zone scope includes：
Global magnetic field smooth change；With " recessed pocket " shape magnetic anomaly, magnetic anomaly amplitude is less than 50nT.
4. the sky of a kind of interlayer oxidation zone sandstone-type uranium Favourable Target Areas according to claim 1 and 2
Between localization method, it is characterised in that：In step 3, for the Redox transitional zone model that step 2 is drawn a circle to approve
Enclose, the maximum local line of region slopes, as redox zone are uprised by low in " recessed pocket " shape magnetic field
Forward's line position.
5. the sky of a kind of interlayer oxidation zone sandstone-type uranium Favourable Target Areas according to claim 1 and 2
Between localization method, it is characterised in that：In step 1, carry out the measurement that magnetotelluric sounding method is explored
Point is away from less than or equal to 200m.
6. the sky of a kind of interlayer oxidation zone sandstone-type uranium Favourable Target Areas according to claim 1 and 2
Between localization method, it is characterised in that：In step 1, the magnetotelluric sounding method determines number according to following formula
According to collection period：
In formula,
T is data collection cycle；
ρ is stratum background resistivity；
P is depth of exploration.
7. a kind of space of interlayer oxidation zone sandstone-type uranium Favourable Target Areas according to claim 3 is determined
Position method, it is characterised in that：In step 2, the specific standards of the global magnetic field smooth change are magnetic survey
Hatching away from less than or equal to 200 meters, point away from less than or equal to 20 meters.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109581513A (en) * | 2018-12-25 | 2019-04-05 | 核工业北京地质研究院 | A kind of Formation of Sandstone-type Uranium Deposits ore target location method based on multi-spatial scale |
| CN110782058A (en) * | 2018-07-31 | 2020-02-11 | 核工业二0八大队 | Method for finding ores in scenic spot of quantitative prediction interbedded oxidation zone sandstone-type uranium ores |
| CN111045106A (en) * | 2019-12-30 | 2020-04-21 | 核工业北京地质研究院 | Method for confining sandstone-type uranium ore body output part of oxidation zone between basin floors |
| CN112296076A (en) * | 2019-08-01 | 2021-02-02 | 中国地质科学院水文地质环境地质研究所 | Method for quantitatively depicting aquifer redox zone of polluted site and application thereof |
| CN112380308A (en) * | 2020-11-17 | 2021-02-19 | 中国地质科学院矿产资源研究所 | Geochemical anomaly delineating method and system based on data regularization |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110782058A (en) * | 2018-07-31 | 2020-02-11 | 核工业二0八大队 | Method for finding ores in scenic spot of quantitative prediction interbedded oxidation zone sandstone-type uranium ores |
| CN110782058B (en) * | 2018-07-31 | 2023-11-07 | 核工业二0八大队 | Method for quantitatively predicting prospect area prospecting of interlayer oxidation zone sandstone type uranium ores |
| CN109581513A (en) * | 2018-12-25 | 2019-04-05 | 核工业北京地质研究院 | A kind of Formation of Sandstone-type Uranium Deposits ore target location method based on multi-spatial scale |
| CN112296076A (en) * | 2019-08-01 | 2021-02-02 | 中国地质科学院水文地质环境地质研究所 | Method for quantitatively depicting aquifer redox zone of polluted site and application thereof |
| CN111045106A (en) * | 2019-12-30 | 2020-04-21 | 核工业北京地质研究院 | Method for confining sandstone-type uranium ore body output part of oxidation zone between basin floors |
| CN111045106B (en) * | 2019-12-30 | 2022-07-26 | 核工业北京地质研究院 | Method for delineating sandstone-type uranium ore body output part of interbedded oxidation zone of basin |
| CN112380308A (en) * | 2020-11-17 | 2021-02-19 | 中国地质科学院矿产资源研究所 | Geochemical anomaly delineating method and system based on data regularization |
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