CN114185105A - Method for delineating favorable area of sandstone-type uranium mineralization - Google Patents
Method for delineating favorable area of sandstone-type uranium mineralization Download PDFInfo
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- 229910052770 Uranium Inorganic materials 0.000 title claims abstract description 84
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 title claims abstract description 83
- 230000033558 biomineral tissue development Effects 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000002349 favourable effect Effects 0.000 title claims abstract description 14
- 238000005553 drilling Methods 0.000 claims abstract description 32
- 239000004576 sand Substances 0.000 claims abstract description 25
- 238000011161 development Methods 0.000 claims abstract description 24
- 230000018109 developmental process Effects 0.000 claims abstract description 24
- 239000002356 single layer Substances 0.000 claims abstract description 21
- 230000009286 beneficial effect Effects 0.000 claims abstract description 10
- 208000035126 Facies Diseases 0.000 claims description 5
- 239000010410 layer Substances 0.000 description 8
- 239000011435 rock Substances 0.000 description 5
- 230000008021 deposition Effects 0.000 description 4
- 238000004062 sedimentation Methods 0.000 description 3
- 238000012795 verification Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 150000001224 Uranium Chemical class 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000012633 leachable Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The invention particularly relates to a method for delineating a sandstone-type uranium mineralization favorable area, which comprises the following steps: calculating the river width-depth ratio of each drill hole according to a calculation formula of Schumm (1960) by utilizing the percentage content of silt and muddy matter of the uranium reservoir in each drill hole in the region with low uranium ore working degree; calculating the width of each single-layer river channel of each drill hole by using the sand depth of each single-layer river channel of each drill hole in the area with low uranium ore working degree and the river width-depth ratio of each drill hole obtained by the calculation, and obtaining the average river channel width of each drill hole by taking the arithmetic mean value of the width of each single-layer river channel of each drill hole; and (4) according to the average river channel width of each drill hole, delineating a beneficial region of uranium mineralization and predicting the uranium mineralization scale. According to the method for delineating the beneficial region of the sandstone-type uranium mineralization, the development width of the ancient river channel is deduced by using a small amount of drilling parameters, so that the beneficial region of the uranium mineralization is further delineated, the prediction of the scale of the uranium mineralization is achieved, the efficiency of prospecting is improved, and the economic investment of prospecting is greatly saved.
Description
Technical Field
The invention relates to the technical field of placeable sandstone type uranium ore exploration, in particular to a delineation method of a favorable area of sandstone type uranium ore formation.
Background
The inner Mongolia twin basin is formed on a middle fold belt of the inner Mongolia under the extrusion stress in the West Huali, and a middle and new generation sedimentary basin formed by gradual development under the stress action of tension buckling in the Yanshan period, lifting in the Xishan period and the like is large in basin area, and the nuclear industry two and eight teams obtain a breakthrough in the area in 2003 to find ores, so that the Bakansaiqii ancient river valley which is long in two hundred kilometers in the North east is roughly determined, and the river valley has successively found and implemented Bayan Wula, Saohoubi 2 ore beds and a series of uranium ore production areas, is listed as a first batch whole investigation area by the nation and becomes an important component part for the construction of the inner Mongolia uranium mine base. At present, the main ore finding means and method for the ground-leachable sandstone type uranium ore is large-interval drilling, the uranium ore exploration mostly utilizes drill holes to cover and drill at equal intervals, the investment drilling cost is high, and the exploration period is long.
Disclosure of Invention
Based on this, it is necessary to provide a method for delineating a favorable region of sandstone-type uranium deposit by using a small number of drilling parameters to estimate the development width of an ancient river channel, so as to further delineate the favorable region of uranium deposit, thereby achieving the prediction of uranium deposit scale, improving the ore-finding efficiency and greatly saving the economic investment of ore finding.
In order to achieve the above purpose, the invention provides the following technical scheme:
a method for delineating a sandstone-type uranium mineralization favorable area comprises the following steps:
(1) calculating the river width-depth ratio of each drill hole according to a calculation formula of Schumm (1960) by utilizing the percentage content of silt of uranium reservoir in each drill hole in the region with low uranium ore working degree;
(2) respectively calculating the width of each single-layer river channel of each drill hole by utilizing the sand depth of each single-layer river channel of each drill hole in the area with low uranium ore working degree and the river width-depth ratio of each drill hole calculated in the step 1, and taking the arithmetic average value of the width of each single-layer river channel of each drill hole to obtain the average river channel width of each drill hole;
(3) and according to the average river channel width of each drill hole, defining a beneficial region of uranium mineralization and predicting the uranium mineralization scale.
Further, the percentage content of the silt of the uranium reservoir in each drill hole is calculated according to known geological drilling data of the uranium mine.
Further, the known uranium ore geological drilling data comprise a small number of drilling parameters, the drilling parameters comprise the thickness of a uranium storage stratum and the thickness of a sand layer of a drilled hole, and the percentage content of silt and mud of the uranium storage stratum is (the thickness of the uranium storage stratum of the drilled hole-the thickness of the uranium storage sand layer of the drilled hole) × 100%/the thickness of the uranium storage stratum of the drilled hole.
Further, the calculation formula of Schumm (1960) is as follows: 1.765M-1.08Wherein F is the river width-depth ratio; and M is the percentage content of silt of the uranium reservoir.
Furthermore, the width of each single-layer river channel is equal to the width-depth ratio of the ancient river channel to the thickness of each single-layer sand body.
And further, identifying the ancient river channel seismic facies width of each drill hole by using the two-dimensional seismic section of each drill hole, and verifying the accuracy of the average river channel width calculated in the verification step (2).
Further, step 3 specifically includes the following steps: firstly, according to the average river channel width of each drill hole, a river channel development range is carved; drilling is continuously constructed in the development range of the carved riverway, and the development range of the oxidized sand body is searched; thirdly, the part where the oxidized sand body is extinguished in the development range of the oxidized sand body is the beneficial area of the uranium mineralization.
The invention has the beneficial technical effects that:
according to the method for delineating the sandstone-type uranium mineralization favorable area, disclosed by the invention, aiming at the area with low uranium ore working degree, related geological parameters are counted by means of a small amount of known drill holes, the width-depth ratio of a river channel is calculated by using an empirical formula, the thickness of a single-layer river channel is known, the development width of the single-layer river channel is calculated reversely, and finally the development width of an ancient river channel is calculated.
The method for delineating the sandstone-type uranium mineralization favorable area has the advantages that the calculation result is relatively accurate after practical drilling and seismic profile verification, drilling verification can be directly and accurately carried out, the investment in exploration for finding ores is saved, and the precision of finding blind ores is improved.
Drawings
FIG. 1 is a flow chart of a method for delineating a region of interest in sandstone-type uranium mineralization, in accordance with the present invention;
FIG. 2 is a transverse two-dimensional seismic profile shallow seismic facies interpretation result diagram of boreholes TZK64-53 in an embodiment.
Detailed Description
In the description of the invention, the river is a bed with natural bodies of water on the surface, or a natural channel through which water can flow, or a visible depression capable of containing continuous or periodic water flow.
The ancient river channel is formed in the deposition period of the target layer of the exploration.
The uranium reservoir is a space in the sedimentary basin for transporting uranium mineralization fluid and storing uranium ores, is the most basic condition for uranium ore formation, and is particularly specified in example 1 in the chalky system lata group.
The uranium reservoir thickness is particularly a sedimentary rock stratum, and is a sedimentary rock stratum thickness layer or a group of rock stratum sedimentary rock stratum thicknesses which have certain uniform characteristics and attributes and are obviously different from the upper layer and the lower layer.
The uranium reservoir sand body thickness is the accumulated thickness of sandstone in a certain sedimentary rock stratum, and the total thickness of siltstone and mudstone can be removed by using the uranium reservoir thickness for calculation, and the sand body thickness can indicate the scale of river development.
The river width-depth ratio is the ratio of the development width to the development thickness of the ancient river channel in the sedimentation stage. The drilling parameters can identify the burial depth of the ancient river channel, and the corresponding development width of the ancient river channel can be obtained through calculation.
The monolayer river channel is the development of the single-cycle discontinuous river channel in the sedimentation period and the sand body sedimentation range of the single-cycle discontinuous river channel.
The seismic facies are the sum of the sedimentary facies on the seismic section, are seismic features formed by the sedimentary environment, and can visually reflect the development range and scale of the ancient river channel.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
The embodiment provides a method for delineating a sandstone-type uranium mineralization favorable area, which is characterized in that in an inner Mongolia two-basin middle Saohang group upper ancient river channel deposition area, the development width of the inner Mongolia two-basin middle Saohang group upper ancient river channel is deduced by using a small amount of drilling parameters, so that the sandstone-type uranium mineralization favorable area is further delineated, the sandstone-type uranium mineralization scale is predicted, the prospecting efficiency is improved, and the prospecting economic investment is greatly saved.
In order to achieve the above object, the present embodiment provides the following technical solutions:
referring to fig. 1, the invention provides a method for delineating a sandstone-type uranium mineralization favorable area, which comprises the following steps:
1. referring to table 1, a small number of drilling parameters in the deposition area of the upper ancient river channel of the sehan group in the middle of the inner Mongolia two-pot ground are used, and the percentage content of the silt of the uranium reservoir in each drilling hole is calculated according to the thickness of the uranium reservoir stratum in each drilling hole and the thickness of the sand layer, wherein the percentage content of the silt of the uranium reservoir in each drilling hole is (the thickness of the uranium reservoir stratum in each drilling hole-the thickness of the uranium reservoir sand layer in each drilling hole) 100%/the thickness of the uranium reservoir stratum in each drilling hole.
2. Referring to table 2, the percentage content of the uranium reservoir silt argillaceous substance calculated in step 1 is used to calculate the river width-depth ratio of each drill hole according to the calculation formula of Schumm (1960), which is: 1.765M-1.08Wherein F is the river width-depth ratio; m is the percentage content of silt.
TABLE 1 ancient river course aspect ratio of each drill hole
3. Utilizing a small number of drilling parameters of an upper ancient river channel deposition area of a Sehan group in the middle of a double-basin field of inner Mongolia, calculating the width of each single-layer river channel of each drilling hole according to the sand depth of each single-layer river channel of each drilling hole and the river width-depth ratio of each drilling hole calculated in the step 2, and taking the arithmetic average value of the width of each single-layer river channel of each drilling hole to obtain the average river channel width of each drilling hole; and the width of each single-layer river channel of each drill hole is larger than the width and depth of the ancient river channel of each drill hole by the thickness of each single-layer sand body of each drill hole.
TABLE 2 average river Width for each borehole
4. According to the average river channel width of each drill hole, a uranium mineralization favorable area is defined, and the uranium mineralization scale is predicted, and the method specifically comprises the following steps: firstly, according to the average river channel width of each drill hole, a river channel development range is carved; drilling is continuously constructed in the development range of the carved riverway, and the development range of the oxidized sand body is searched; thirdly, the part where the oxidized sand body is extinguished in the development range of the oxidized sand body is the beneficial area of the uranium mineralization.
Example 2
Referring to FIG. 2, the transverse two-dimensional seismic section through boreholes TZK64-53 identifies a borehole TZK64-53 having an ancient river width of 110 m. Example 1 the ancient river channel width in this area was 109.54m calculated from boreholes TZK64-53, with an error rate of 0.42%, demonstrating that the method of the present invention can be deployed in this area.
As shown in FIGS. 1-2 and tables 1-2, the method helps to find one large and small uranium deposit on the depression of the twin-basin.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. A method for delineating a favorable area of sandstone-type uranium mineralization is characterized by comprising the following steps of:
step (1), calculating the river width-depth ratio of each drill hole according to a calculation formula of Schumm (1960) by utilizing the percentage content of silt of uranium reservoir in each drill hole in a region with low uranium ore working degree;
step (2) respectively calculating the width of each single-layer river channel of each drill hole by utilizing the sand depth of each single-layer river channel of each drill hole in the region with low uranium ore working degree and the river width-depth ratio of each drill hole calculated in the step (1), and taking the arithmetic average value of the width of each single-layer river channel of each drill hole to obtain the average river channel width of each drill hole;
and (3) according to the average river channel width of each drill hole, delineating a beneficial uranium mineralization area, and predicting the uranium mineralization scale.
2. The method for delineating a beneficial region of sandstone-type uranium mineralization according to claim 1, wherein the percentage of silt content of the uranium reservoir in each borehole is calculated from known geological drilling data of the uranium ore.
3. The method for delineating a favored zone of sandstone-type uranium mineralization according to claim 1, wherein the known uranium ore geological drilling data includes a small number of drilling parameters, wherein the drilling parameters include a drilled uranium reservoir stratum thickness and a sand thickness, and wherein the percentage of uranium reservoir silt shale is 100%/drilled uranium reservoir stratum thickness (drilled uranium reservoir stratum thickness-drilled uranium sand thickness).
4. A method for delineation of a favored zone of sandstone-type uranium mineralization according to claim 1, wherein the Schumm (1960) formula is: 1.765M-1.08Wherein F is the river width-depth ratio; and M is the percentage content of silt of the uranium reservoir.
5. The method for delineating a favored zone of sandstone-type uranium mineralization according to claim 1, wherein the width of each single-layer channel is greater than the width of ancient channel by the thickness of each single-layer sand body.
6. The method for delineating an advantageous region of sandstone-type uranium mineralization according to claim 1, wherein the accuracy of the average river width calculated in the step (2) is verified by identifying the seismic facies width of the ancient river of each drill hole by using the two-dimensional seismic profile of each drill hole.
7. The method for delineating a favored zone of sandstone-type uranium mineralization according to any of claims 1-6, wherein step (3) comprises the following steps: firstly, according to the average river channel width of each drill hole, a river channel development range is carved; drilling is continuously constructed in the development range of the carved riverway, and the development range of the oxidized sand body is searched; thirdly, the part where the oxidized sand body is extinguished in the development range of the oxidized sand body is the beneficial area of the uranium mineralization.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024016493A1 (en) * | 2022-07-22 | 2024-01-25 | 核工业北京地质研究院 | Method for identifying exudative sandstone-type uranium deposit |
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- 2021-11-15 CN CN202111347603.5A patent/CN114185105A/en active Pending
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| WO2024016493A1 (en) * | 2022-07-22 | 2024-01-25 | 核工业北京地质研究院 | Method for identifying exudative sandstone-type uranium deposit |
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