CN117950048A - Method for delineating and searching target area of deep sandstone type uranium deposit - Google Patents
Method for delineating and searching target area of deep sandstone type uranium deposit Download PDFInfo
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Abstract
The invention belongs to the technical field of uranium mineralization prediction, and particularly relates to a method for delineating a target area for prospecting of a deep sandstone-type uranium deposit, which comprises the following steps: analyzing key mineral elements of a deep uranium mining layer, identifying key geology, and delineating a mining target area; and fourthly, drilling and checking, wherein the method for delineating the prospecting target area of the deep sandstone-type uranium deposit designed by the invention adopts a means of combining geology, geochemistry and geophysical prospecting, and utilizes the existing data to rapidly determine deep horizon key mineral elements and key geological problems, so that a beneficial technical support can be provided for optimization of the target area and geological exploration of the uranium deposit.
Description
Technical Field
The invention belongs to the technical field of uranium mineralization prediction, and particularly relates to a method for delineating a target area for prospecting of a deep sandstone-type uranium deposit.
Background
Currently, sandstone-type uranium ores become the most important uranium ore types in the world, and are also the most important economic and recoverable types in China. Before 2005, the sandstone type uranium deposit exploration guidelines of China mainly grasp four aspects of 'rich, near, shallow and easy', and the exploration depth is generally in a shallow section of 300m at the edge of a basin; after 2005, the exploration guidelines began to adjust to five aspects of "deep, rich, variable, multiple, far," where "deep" means that the sandstone-type uranium deposit depth reached 1500m or less. At present, the depth of prospecting at the south edge of the Yili basin is up to 900m, the depth of prospecting at the middle part of the two-connected basin and the north part of the Erdos basin is up to 800m, and the depth of prospecting at the Songliao basin is up to 700m. Uranium ore (chemical) bodies were newly found in the aeolian deposition system of the chalk line lohe group at 700-2000m in the southwest of the erdos basin. The deep uranium abnormal areas are newly found in the basins such as the Pascal, the Qiao, the Tarim, the Songliao and the spring, and the deep uranium (chemical) bodies and the uranium abnormal areas are found, so that the research field and the prospecting space of the sandstone type uranium ores are expanded, and the theoretical research and the prospecting of the sandstone type uranium ores are affected deeply.
According to the characteristics of large sand body scale, wide mineralization area, high grade and large thickness of the existing deep sandstone type uranium deposit, the method and technology for predicting deep prospecting remote scenic spots and delineating prospecting target spots aiming at deep sandstone type uranium ores need to be further optimized.
Disclosure of Invention
The invention provides a method for delineating and searching target areas of deep sandstone-type uranium deposit, which is used for updating and optimizing the method for delineating and searching target areas of deep sandstone-type uranium deposit in the prior art so as to provide beneficial technical support for subsequent geological exploration of the deep sandstone-type uranium deposit.
The technical scheme of the invention is as follows:
a method for delineating a target area of prospecting for a deep sandstone-type uranium deposit, comprising the steps of:
analyzing deep uranium mining layer key control ore elements, including:
Step 1.1 uranium source controlled ore analysis;
Step 1.2, building a control mine;
Step 1.3, constructing a control mine;
step 1.4, modifying and controlling ores;
Step two, identifying the key geology, including:
step 2.1, recognizing the ore-containing sand body;
step 2.2, facilitating the identification of the ore formation;
Step 2.3, oxidation-reduction transition zone identification and uranium ore prospecting mark identification;
Step three, delineating a target area for prospecting;
And fourthly, drilling and checking.
The uranium source ore control analysis in the step 1.1 specifically includes: when the uranium abundance value range of the rock mass in the source erosion area is 2 multiplied by 10 -6～8×10-6 and the uranium activation mobility range is 50% -90%, the rock mass in the source erosion area is easy to form rich uranium sources when the uranium content range of the mineral bearing layer is 3 multiplied by 10 -6～6×10-6, and a large amount of uranium can be leached out and transferred into the ground along with rainwater, so that favorable conditions are provided for uranium ore formation;
The step 1.2 of building the control mine specifically comprises the following steps: the sandstone uranium ore sand bodies are spread in a belt shape on a plane, the length range is 20-60 km, and the width range is 3-30 km; the sandstone uranium ore sand body is of a mud-sand-mud interbedded structure, is suitable for being overlapped into a thick large sand body, has a mudstone interlayer in the middle, has a single-layer sand body thickness of 10-50 m, has an accumulated sand body thickness of 20-150 m, and has a sand content of 40-80%; in the deep horizon uranium mining process, the favorable lithology is medium coarse sandstone and medium sandstone containing gravel, and the favorable lithology is medium fine sandstone;
The step 1.3 of constructing and controlling the ore specifically comprises the following steps: the construction movement determines the basin deposition evolution process, the lifting, extrusion and wrinkling of the basin can lead to fracture generation, and granite slurry invades along the fracture to form a main uranium source of uranium ore; the construction control mine consists of two aspects, namely, one aspect is that the construction movement controls basin deposition; secondly, constructing a control function of the tele-reversing on the post-generation alteration; the structural tele-movement reversal causes the stratum to lift and suffer from weathering and degradation, if the structural deformation is strong, the submerged oxidation zone type uranium ore formation is mainly used, and if the structural deformation is medium in strength, the interlayer oxidation zone type uranium ore formation is mainly used;
The step 1.4 of modifying the control ore specifically comprises the following steps: modifying and controlling the surface water infiltration oxidation, mainly developing diving and diving-interlayer oxidation; the depth of development of the submerged oxidation zone in the vertical direction is related to the exposure of the stratum and the lithology of the lower part; when the diving oxidation is vertically met with the mud stratum barrier, the partial bedding oxidation is generated to form a diving-interlayer oxidation zone, and the length of the oxidation zone is 15-30 km; the oxidation band width ranges from 1km to 12km, and the oxidation-reduction transition band length ranges from 18km to 45km; the width range is 1 km-14 km, the maximum oxidation depth is 200-480 m, and the front length is 20-65 km; the factors are mainly controlled by sand layering and connectivity factors.
The step 2.1 of ore-containing sand body identification comprises the following steps: according to the existing drilling, earthquake and electric method data of the research area, carrying out fine analysis on a deep horizon deposition system to find out the position where the sand permeability and hydrogeological environment are easy to change; the system collects sand samples of different sections, analyzes the characteristic parameters of the geochemistry environment, and establishes a geological-geochemistry identification mark of the sand-containing body of the sandstone-type uranium deposit for identifying the sand-containing body;
The sandstone-type uranium ore-containing sand geological-geochemical identification mark specifically comprises the following steps: oxidation-reduction potential delta Eh value, pH value, clay content and Fe 2+/Fe3+ value.
The oxidation-reduction potential in the geological-geochemical mark of the ore-bearing sand body of the sandstone-type uranium deposit in the second step comprises the following steps: the higher the oxidation-reduction potential Δeh value, the stronger the oxidation-reduction capacity of the rock; the oxidation-reduction potential delta Eh value in the sand body is in banded distribution, wherein the oxidation band delta Eh value ranges from 47 mV to 70mV, the oxidation-reduction transition band delta Eh value ranges from 138 mV to 188mV, and the reduction band delta Eh value ranges from 60 mV to 100mV, so that the oxidation-reduction transition band has stronger oxidation-reduction capability and is beneficial to uranium ore formation;
The pH value in the geological-geochemical mark of the sandstone-type uranium ore-containing sand body comprises the following steps: typical oxidized band type sandstone uranium ores have vertical zonation of acid from top to bottom, wherein the oxidized band is generally alkaline and has a pH value of 8.98-9.8; the redox transition zone is generally neutral-acidic and has a pH value of 7.59-5.8; the reducing band is alkalescent, and the pH value is 8.0-9.4;
The clay content in the geological-geochemical mark of the ore-bearing sand body of the sandstone-type uranium deposit in the second step comprises the following steps: the clay content is characterized by the content of principal elements Al 2O3 and CaO; taking the content of Al 2O3 and CaO in the two-connected basin as examples, the two-connected basin has better banding property, the content of Al 2O3 plus CaO in the oxidation zone is 10.07-10.75 percent, and the content is lower; the content of the oxidation-reduction transition zone Al 2O3 plus CaO is 10.84 to 16.60 percent, and the content is higher; the content of the reduction zone Al 2O3 plus CaO is 9.98-11.415 percent, and the content is between the reduction zone Al 2O3 plus CaO and the reduction zone CaO; the high content of the clay in the oxidation-reduction transition zone is beneficial to the adsorption of uranium ore by the clay;
The Fe 2+/Fe3+ value in the geological-geochemical mark of the ore-bearing sand body of the sandstone-type uranium deposit in the second step comprises the following steps: the oxidation zone Fe 2+/Fe3+ is 0.31-0.42, which means that the oxidation degree is high, the reduction zone Fe 2+/Fe3+ is 0.58-0.72, which means that the reduction capability is high, and the oxidation-reduction transition zone Fe 2+/Fe3+ is 0.98-1.07, which means that the oxidation degree is reduced, the reduction capability is increased, and the uranium ore is facilitated.
The step 2.2 advantageous mineforming configuration identification comprises: and (3) utilizing the electric method, the magnetic method, the gravity and the seismic data to define the spatial distribution characteristics of the sand body of the target layer and the structure pattern of the target layer, finding out the distribution rules and the structure patterns of different lithology-lithofacies in the relatively strong structure active area, and defining the favorable ore formation structure position.
The step 2.3 of redox transition zone identification comprises: distinguishing the oxidation-reduction transition boundary geological mark by using the characteristic information of coal field drilling, drilling logging curves and lithology, wherein the oxidation color comprises the following components: yellow, pale yellow, brown yellow, bright yellow; reducing the color of the band to gray; the total thickness range of the oxidized sand body/sand body is 20-60%; the geochemical markers include Fe 3+/Fe2+, ΔEh, pH; and a deep oxidation-reduction transition zone identification and positioning system is established by combining a micro-fine grained detection and high-precision magnetic measurement method.
Step 2.4 uranium ore prospecting mark identification includes: optimizing a data processing flow by using the ground radioactivity measurement data, extracting abnormal display of deep mine induced anomalies on the ground surface, and determining the distribution characteristics of uranium mine prospecting marks; the surface radioactivity measurement data comprises: ground radon concentration abnormal value, fine granulating soil uranium abnormal value and high-precision magnetic measurement abnormal;
The ground radon concentration abnormal value is generally more than 10000Bq/m 3; the uranium anomaly value range of the fine granulating probe soil is 2 multiplied by 10 -6～15×10-6; the high-precision magnetic measurement anomaly comprises: the oxidation zone is in the higher magnetic field region and the redox transition zone is in the lower magnetic field region.
The step three of delineating the target area for prospecting comprises the following steps: determining a uranium source for controlling ore and controlling ore construction according to the steps 1.1 and 1.2, and determining the beneficial part of uranium ore according to the steps 1.3, 1.4, 2.1, 2.2, 2.3 and 2.4.
The fourth drilling verification comprises drilling verification of the uranium mineforming favorable section determined in the step 3 to be available for drilling verification.
The invention has the beneficial effects that:
The deep sandstone uranium deposit has the characteristics of large sand body scale, wide mineralization area, high grade and large thickness. Therefore, the research of the key geology problem of the deep sandstone uranium mining is deepened, the deep mining remote scenic spot is predicted on the basis, and the mining target area is defined, so that the reference and the reference are provided for the deployment of the national deep uranium mining resource exploration work.
The method for delineating and searching the target area of the deep sandstone-type uranium deposit, which is designed by the invention, adopts a means of combining geology, geochemistry and geophysical prospecting, utilizes the existing data to rapidly determine deep horizon-dependent keying ore elements and key geology problems, and can provide beneficial technical support for target area optimization and uranium deposit geological investigation work.
Drawings
Figure 1 is a flow chart of a method for delineating a target area of a deep sandstone-type uranium deposit according to the present invention;
FIG. 2 is a diagram showing the alteration of the upper segment of the Siraitia grosvenorii group in the deep and remote scenic region of the Naohoo root in accordance with the embodiment of the present invention;
FIG. 3 is a uranium anomaly graph of micro-fine soil in a brain-wood root recessed distant view area in an embodiment of the invention;
FIG. 4 is a longitudinal lithology geochemical cross-section of a brain-wood root recessed ancient river in an embodiment of the invention
Detailed Description
A method of the present invention for delineating a target area for mine exploration in a deep sandstone-type uranium deposit is described in detail below with reference to the accompanying drawings and examples.
Step one, deep level key control ore factor analysis
Through data collection, arrangement, field geological investigation and indoor analysis and test, the key mineral elements of the deep uranium ore formation and key minerals are analyzed from aspects of uranium source ore control, construction ore control, transformation ore control and the like.
Step 1.1 uranium Source Ore control
In order to enrich and form uranium ores in a large amount, a rich uranium source is needed, and the uranium abundance value (2×10 -6～8×10-6) and uranium activation mobility (50-90%) of rock mass in an etched source area are high, so that a large amount of uranium can be leached out and transferred into the ground along with rainwater, and favorable conditions are provided for uranium ore formation. Meanwhile, the uranium content (3×10 -6～6×10-6) of the ore-bearing layer is higher, which is beneficial to uranium ore formation.
Step 1.2 building a controlled Ore
The sandstone uranium ore sand bodies are spread in a belt shape on a plane and have a certain scale (20-60 km in length and 3-30 km in width); the vertical mud-sand-mud interbedded structure can be overlapped into thick and large sand bodies, and a mudstone interlayer is arranged in the middle (the thickness of a single-layer sand body is 10-50 m, the thickness of an accumulated sand body is 20-150 m, and the sand content is 40-80%). In the deep horizon uranium mining process, the favorable lithology is medium coarse sandstone and medium sandstone containing gravels, the medium fine sandstone is secondarily used, and an accommodating space is provided for uranium enrichment.
Step 1.3 construction of controlling Ore
The deposition evolution process of the basin is determined by the construction movement, the basin is possibly broken by lifting, extruding and wrinkling, and at the moment, granite slurry invades along the break, so that a main uranium source of uranium ore is formed. Analysis has shown that the formation control of ores is mainly reflected in the following two aspects: first, control over deposition is structured. The embedded depth of the sand body at the upper section of the siran group is 260-350 m, the embedded depth of the sand body at the lower section of the siran group is 300-780 m, and gray sand development parts are mainly found; second, the structure reverses the control of the subsequent alteration. The structural inversion can lead to the lifting of stratum and is subject to weathering and degradation, if the structural deformation is strong, the submerged oxidation zone type uranium ore formation is mainly used, and if the structural deformation is medium in strength, the interlayer oxidation zone type uranium ore formation is mainly used.
Step 1.4 modification of controlling Ore
Post-reforming generally refers to surface water infiltration oxidation, primarily developmental diving, diving-inter-layer oxidation. The depth of development of the submerged oxidation zone in the vertical direction is related to the exposure of the stratum and the lithology of the lower part; when the diving oxidation is in vertical contact with the mud stratum barrier, the partial bedding oxidation is generated to form a diving-interlayer oxidation zone, the oxidation zone (length 15-30 km, width 1-12 km), oxidation-reduction transition zone (length 18-45 km, width 1-14 km), maximum oxidation depth (200-480 m) and front line length (20-65 km) are mainly controlled by factors such as layering and connectivity of sand bodies, and the uranium ore formation scale is directly determined.
Step two, key geological problem identification
Step 2.1 ore-containing sand identification technique
The deep horizon deposition system is subjected to fine analysis according to the existing drilling, earthquake, electric method and other data in a research area, and the positions where sand permeability and hydrogeological environment are easy to change are ascertained; and (3) collecting sand samples of different sections by the system, analyzing the characteristic parameters of the geochemical environment, and establishing a geological-geochemical parameter identification mark of the sand-containing body of the sandstone-type uranium deposit for identifying the sand-containing body. The sandstone-type uranium ore-containing sand geological-geochemical parameter identification mark comprises the following steps:
(1) Oxidation-reduction potential (Δeh)
The oxidation-reduction potential (DeltaEh) can better reflect the oxidation-reduction capability of the rock, and the higher the DeltaEh value is, the stronger the oxidation-reduction capability of the rock is. The oxidation-reduction potential (DeltaEh) in the sand body is banded. The oxidation band delta Eh is generally 47-70 mV, the oxidation-reduction transition band delta Eh is 138-188 mV, and the reduction band delta Eh is 60-100 mV, which shows that the oxidation-reduction transition band has stronger oxidation-reduction capability and is beneficial to uranium ore formation.
(2) PH value (pH)
Typical oxidized band type sandstone uranium ores generally have vertical zonal properties of acid up and down. The oxidation zone is generally alkaline, and the pH value is 8.98-9.8; the redox transition zone is generally neutral-acidic and has a pH value of 7.59-5.8; the reduction zone is alkalescent, and the pH value is 8.0-9.4, which is beneficial to the ore formation of sandstone uranium.
(3) Clay content
The clay content can be characterized by the content of the principal elements Al 2O3 and CaO. The Al 2O3 and CaO contents of the two-connected basin have better banding property. The content of the oxidation zone Al 2O3 plus CaO (10.07 to 10.75)% is lower; the content of the oxidation-reduction transition zone Al 2O3 plus CaO (10.84 to 16.60)% is higher; the content of the reduction zone Al 2O3 plus CaO (9.98-11.415)% is between the two; the high content of the clay in the oxidation-reduction transition zone is beneficial to the adsorption of uranium ore by the clay.
(4)Fe2+/Fe3+
The oxidation zone Fe 2+/Fe3+ is 0.31-0.42, which means that the oxidation degree is high, the reduction zone Fe 2+/Fe3+ is 0.58-0.72, which means that the reduction capability is high, and the oxidation-reduction transition zone Fe 2+/Fe3+ is 0.98-1.07, which means that the oxidation degree is reduced, the reduction capability is increased, and the uranium ore is facilitated.
Step 2.2 advantageous mineification Structure identification technique
And (3) utilizing data such as an electric method, a magnetic method, gravity, earthquake and the like to define the spatial distribution characteristics of the sand body of the target layer and the structure pattern of the target layer, researching the distribution rules and the structure patterns of different lithology-lithofacies in a relatively strong structure activity area, and defining the favorable structure position of the ore formation.
Step 2.3 Redox transition zone identification technique
By utilizing the information of coal field drilling, drilling logging curves, lithology characteristics and the like, geological marks (oxidation color (yellow, pale yellow, brown yellow and bright yellow), reduction color (gray), total thickness of oxidized sand body/sand body (20-60%), geochemical marks (Fe 3+/Fe2+, delta Eh, pH value) and the like of oxidation-reduction transition zone boundary lines are researched and distinguished, and a set of method system suitable for identifying and positioning deep oxidation-reduction transition zones is established by combining the technologies of micro-fine grained detection, high-precision magnetic measurement and the like.
Step 2.4 uranium ore prospecting mark identification technology
The data processing flow is optimized by utilizing ground radioactivity measurement data, including ground radon concentration anomaly (generally more than 10000Bq/m 3), fine grain detection soil uranium anomaly (2×10 -6～15×10-6), high-precision magnetic measurement anomaly (namely that an oxidation zone is positioned in a higher magnetic field area, and a redox transition zone is positioned in a lower magnetic field area), and the like, so that the anomaly display of deep mining anomaly on the ground surface is extracted, and the uranium mining mark distribution characteristics are determined.
Step three, delineating a target area for prospecting
Based on the step 1.1, the brain-wood root pit source etching area has large scale of binary granite, high uranium content, average uranium content of 3.6X10 -6～8.3×10-6, a large amount of U is leached by rainwater, and is transferred into underground water from rock, and meanwhile, the average uranium content of Siraitia grosvenorii strata is 3.81× -6～6.09×10-6, so that a main uranium source is provided for pit uranium ore formation.
Based on the step 1.2, the brain wood root pit mineralized body is an upper section ancient river channel of the Siraitia grosvenorii, is mainly a gravel river channel, has the length of about 40km, the width of 5-15 km, the scale is large, the thickness of the river channel sand body is 40-180 m, the river channel bending rate is 1.5, and is more beneficial to sandstone uranium mineralization.
Based on the steps 1.3, 1.4, 2.1 and 2.3, the bottom plate of the brain wood root sunken ancient river channel is gray green argillaceous siltstone at the lower section of the Siraitia grosvenorii group, and the burial depth is 420-780 m; the river top plate is red mudstone at the upper section of the Siraitia grosvenorii, the burial depth is 360-420 m, the characteristics of shallow east depth in the west are achieved, and the uranium source can flow from the west to the east. Meanwhile, the thickness of sand bodies in the river channel is large, the granularity is coarse, the permeability is good, most of sand bodies in the center of the river channel are oxidized to be bright yellow and red, gray sand bodies only remain at the bending part of the river channel, and the total thickness of the oxidized sand bodies/sand bodies is 31-45% (shown in figure 2). In the redox transition zone Δeh averages 151mv, ph averages 7.1, al 2O3 +cao averages 16.31%, fe 2+/Fe3+ averages 1.02, which is a favorable site for uranium minearformation.
Based on 2.2 and 2.4, soil radon gas measurement work with a point distance of 1km multiplied by 1km is carried out on the brain-wood root pits, the concentration of radon gas is greater than 14212Bq/m 3 and is defined as abnormal corona, the concentration of radon gas is 11355-14212 Bq/m 3 and is defined as high corona, and the concentration of radon gas is 8594-11355 Bq/m 3 and is defined as high corona. According to the ancient river channel mining model, the clamping positions of the abnormal corona and the high corona or the high corona are determined to be the beneficial area of the ancient river channel uranium mining.
The brain root pit is developed to have a fine granulating detection quantity of 1km multiplied by 1km, the mineral elements adsorbed by the clay particles are separated by combining a micron screening technology and a nano observing technology, and the content of the mineral elements is tested by using a high-sensitivity ICP-MS to obtain an abnormal chart of the mineral elements in the area, as shown in figure 3. The uranium abnormality (4.2 multiplied by 10 -6～10.8×10-6) of the micronized probe soil is mainly concentrated in the upper ancient river channel of the siren group in the south of the brain wood root pit, is relatively matched with the presumed redox transition zone, and indicates that the area has a better uranium mineralization prospect.
And carrying out high-precision magnetic measurement work of the point distance of 20m on the brain-wood root pit, wherein the magnetic anomaly amplitude of the region is mostly in the range of-20 to 120nT, the estimated redox transition zone is a low-magnetic transition zone, and the estimated redox transition zone is basically matched with the geological estimated redox transition zone, so that the region has a better uranium ore prospect.
Step four, drilling verification
Based on the third step, a uranium mineralization favorable section for drilling verification is determined, a series of drilling holes are arranged on the south side of the georgette pit georgette, and as a result, the drilling holes EZK-1099 develop uranium mineralization near the front of the oxidation zone, as shown in fig. 4.
The embodiments of the present invention have been described in detail, but the present invention is not limited to the above examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.
Claims (8)
1. A method for delineating a target area for prospecting for a deep sandstone-type uranium deposit, comprising the steps of:
analyzing deep uranium mining layer key control ore elements, including:
Step 1.1 uranium source controlled ore analysis;
Step 1.2, building a control mine;
Step 1.3, constructing a control mine;
step 1.4, modifying and controlling ores;
Step two, identifying the key geology, including:
step 2.1, recognizing the ore-containing sand body;
step 2.2, facilitating the identification of the ore formation;
Step 2.3, oxidation-reduction transition zone identification and uranium ore prospecting mark identification;
Step three, delineating a target area for prospecting;
And fourthly, drilling and checking.
2. A method for delineating a target area for prospecting a deep sandstone-type uranium deposit according to claim 1, wherein: the uranium source ore control analysis in the step 1.1 specifically includes: when the uranium abundance value range of the rock mass in the source erosion area is 2 multiplied by 10 -6～8×10-6 and the uranium activation mobility range is 50% -90%, the rock mass in the source erosion area is easy to form rich uranium sources when the uranium content range of the mineral bearing layer is 3 multiplied by 10 -6～6×10-6, and a large amount of uranium can be leached out and transferred into the ground along with rainwater, so that favorable conditions are provided for uranium ore formation;
The step 1.2 of building the control mine specifically comprises the following steps: the sandstone uranium ore sand bodies are spread in a belt shape on a plane, the length range is 20-60 km, and the width range is 3-30 km; the sandstone uranium ore sand body is of a mud-sand-mud interbedded structure, is suitable for being overlapped into a thick large sand body, has a mudstone interlayer in the middle, has a single-layer sand body thickness of 10-50 m, has an accumulated sand body thickness of 20-150 m, and has a sand content of 40-80%; in the deep horizon uranium mining process, the favorable lithology is medium coarse sandstone and medium sandstone containing gravel, and the favorable lithology is medium fine sandstone;
The step 1.3 of constructing and controlling the ore specifically comprises the following steps: the construction movement determines the basin deposition evolution process, the lifting, extrusion and wrinkling of the basin can lead to fracture generation, and granite slurry invades along the fracture to form a main uranium source of uranium ore; the construction control mine consists of two aspects, namely, one aspect is that the construction movement controls basin deposition; secondly, constructing a control function of the tele-reversing on the post-generation alteration; the structural tele-movement reversal causes the stratum to lift and suffer from weathering and degradation, if the structural deformation is strong, the submerged oxidation zone type uranium ore formation is mainly used, and if the structural deformation is medium in strength, the interlayer oxidation zone type uranium ore formation is mainly used;
The step 1.4 of modifying the control ore specifically comprises the following steps: modifying and controlling the surface water infiltration oxidation, mainly developing diving and diving-interlayer oxidation; the depth of development of the submerged oxidation zone in the vertical direction is related to the exposure of the stratum and the lithology of the lower part; when the diving oxidation is vertically met with the mud stratum barrier, the partial bedding oxidation is generated to form a diving-interlayer oxidation zone, and the length of the oxidation zone is 15-30 km; the oxidation band width ranges from 1km to 12km; the length of the oxidation-reduction transition zone is 18 km-45 km; the width range is 1 km-14 km, the maximum oxidation depth is 200-480 m, and the front length is 20-65 km; mainly controlled by the layering and connectivity factors of the sand body.
3. A method for delineating a target area for prospecting a deep sandstone-type uranium deposit according to claim 2, wherein: the step 2.1 of ore-containing sand body identification comprises the following steps: according to the existing drilling, earthquake and electric method data of the research area, carrying out fine analysis on a deep horizon deposition system to find out the position where the sand permeability and hydrogeological environment are easy to change; the system collects sand samples of different sections, analyzes the characteristic parameters of the geochemistry environment, and establishes a geological-geochemistry-identification mark of the sand-containing body of the sandstone-type uranium deposit for identifying the sand-containing body;
The sandstone-type uranium ore-containing sand geological-geochemical identification mark specifically comprises the following steps: oxidation-reduction potential delta Eh value, pH value, clay content and Fe 2+/Fe3+ value.
4. A method for delineating a target area for prospecting a deep sandstone-type uranium deposit according to claim 3, wherein: the oxidation-reduction potential in the geological-geochemical mark of the ore-bearing sand body of the sandstone-type uranium deposit in the second step comprises the following steps: the higher the oxidation-reduction potential Δeh value, the stronger the oxidation-reduction capacity of the rock; the oxidation-reduction potential delta Eh value in the sand body is in banded distribution, wherein the oxidation band delta Eh value ranges from 47 mV to 70mV, the oxidation-reduction transition band delta Eh value ranges from 138 mV to 188mV, and the reduction band delta Eh value ranges from 60 mV to 100mV, so that the oxidation-reduction transition band has stronger oxidation-reduction capability and is beneficial to uranium ore formation;
The pH value in the geological-geochemical mark of the sandstone-type uranium ore-containing sand body comprises the following steps: typical oxidized band type sandstone uranium ores have vertical zonation of acid from top to bottom, wherein the oxidized band is generally alkaline and has a pH value of 8.98-9.8; the redox transition zone is generally neutral-acidic and has a pH value of 7.59-5.8; the reducing band is alkalescent, and the pH value is 8.0-9.4;
The clay content in the geological-geochemical mark of the ore-bearing sand body of the sandstone-type uranium deposit in the second step comprises the following steps: the clay content is characterized by the content of principal elements Al 2O3 and CaO; taking the content of Al 2O3 and CaO in the two-connected basin as examples, the two-connected basin has better banding property, the content of Al 2O3 plus CaO in the oxidation zone is 10.07-10.75 percent, and the content is lower; the content of the oxidation-reduction transition zone Al 2O3 plus CaO is 10.84 to 16.60 percent, and the content is higher; the content of the reduction zone Al 2O3 plus CaO is 9.98-11.415 percent, and the content is between the reduction zone Al 2O3 plus CaO and the reduction zone CaO; the high content of the clay in the oxidation-reduction transition zone is beneficial to the adsorption of uranium ore by the clay;
The Fe 2+/Fe3+ value in the geological-geochemical mark of the ore-bearing sand body of the sandstone-type uranium deposit in the second step comprises the following steps: the oxidation zone Fe 2+/Fe3+ is 0.31-0.42, which means that the oxidation degree is high, the reduction zone Fe 2+/Fe3+ is 0.58-0.72, which means that the reduction capability is high, and the oxidation-reduction transition zone Fe 2+/Fe3+ is 0.98-1.07, which means that the oxidation degree is reduced, the reduction capability is increased, and the uranium ore is facilitated.
5. A method for delineating a target area for prospecting a deep sandstone-type uranium deposit according to claim 4, wherein: the step 2.2 advantageous mineforming configuration identification comprises: and (3) utilizing the electric method, the magnetic method, the gravity and the seismic data to define the spatial distribution characteristics of the sand body of the target layer and the structure pattern of the target layer, finding out the distribution rules and the structure patterns of different lithology-lithofacies in the relatively strong structure active area, and defining the favorable ore formation structure position.
6. A method for delineating a target area for prospecting a deep sandstone-type uranium deposit according to claim 1, wherein: the step 2.3 of redox transition zone identification comprises: distinguishing the oxidation-reduction transition boundary geological mark by using the characteristic information of coal field drilling, drilling logging curves and lithology, wherein the oxidation color comprises the following components: yellow, pale yellow, brown yellow, bright yellow; reducing the color of the band to gray; the total thickness range of the oxidized sand body/sand body is 20-60%; the geochemical markers include Fe 3+/Fe2+, ΔEh, pH; and a deep oxidation-reduction transition zone identification and positioning system is established by combining a micro-fine grained detection and high-precision magnetic measurement method.
Step 2.4 uranium ore prospecting mark identification includes: optimizing a data processing flow by using the ground radioactivity measurement data, extracting abnormal display of deep mine induced anomalies on the ground surface, and determining the distribution characteristics of uranium mine prospecting marks; the surface radioactivity measurement data comprises: ground radon concentration abnormal value, fine granulating soil uranium abnormal value and high-precision magnetic measurement abnormal;
The ground radon concentration abnormal value is generally more than 10000Bq/m 3; the uranium anomaly value range of the fine granulating probe soil is 2 multiplied by 10 -6～15×10-6; the high-precision magnetic measurement anomaly comprises: the oxidation zone is in the higher magnetic field region and the redox transition zone is in the lower magnetic field region.
7. A method for delineating a target area for prospecting a deep sandstone-type uranium deposit according to claim 6, wherein: the step three of delineating the target area for prospecting comprises the following steps: and determining the uranium source ore control according to the steps 1.1 and 1.2, and determining the beneficial parts of uranium ore formation according to the steps 1.3, 1.4, 2.1, 2.2, 2.3 and 2.4.
8. A method for delineating a target area for prospecting a deep sandstone-type uranium deposit according to claim 7, wherein: the fourth drilling verification comprises drilling verification of the uranium mineforming favorable section determined in the step 3 to be available for drilling verification.
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