CN112731559A - Method for rapidly positioning sandstone-type uranium mineralization through coal field drilling information - Google Patents
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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 80
- 239000003245 coal Substances 0.000 title claims abstract description 61
- 230000033558 biomineral tissue development Effects 0.000 title claims abstract description 60
- 238000005553 drilling Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000008021 deposition Effects 0.000 claims abstract description 51
- 229910052704 radon Inorganic materials 0.000 claims abstract description 33
- SYUHGPGVQRZVTB-UHFFFAOYSA-N radon atom Chemical compound [Rn] SYUHGPGVQRZVTB-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000002689 soil Substances 0.000 claims abstract description 32
- 230000007704 transition Effects 0.000 claims abstract description 31
- 230000002349 favourable effect Effects 0.000 claims abstract description 18
- 230000033116 oxidation-reduction process Effects 0.000 claims abstract description 18
- 230000002159 abnormal effect Effects 0.000 claims description 30
- 238000007254 oxidation reaction Methods 0.000 claims description 11
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- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000000994 depressogenic effect Effects 0.000 description 2
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Abstract
The invention belongs to the technical field of uranium mineralization prediction, and particularly relates to a method for quickly positioning sandstone-type uranium mineralization by using coal field drilling information, which comprises the following steps: analyzing the stratum structure of a drilling area of the coal field, checking the stratum color and identifying a target layer containing ores; analyzing the resistivity information of the ore-containing target layer to determine a favorable deposition environment; analyzing a natural gamma logging curve in a coal field borehole in the favorable deposition environment, and determining an oxidation-reduction transition zone; setting a soil radon gas profile in the redox transition zone, measuring the soil radon gas value, and positioning a uranium mineralization part; and (5) drilling and verifying to determine the uranium mineralization position. The method can accurately, efficiently and quickly position sandstone-type uranium mineralization.
Description
Technical Field
The invention belongs to the technical field of uranium mineralization prediction, and particularly relates to a method for quickly positioning sandstone-type uranium mineralization by using coal field drilling information.
Background
In recent years, coal and uranium are greatly developed, a novel coal-uranium ore finding combined mode is formed, the traditional ore finding thought is broken through, the state that the conventional coal field, petroleum and nuclear industrial systems are respectively polite in the aspect of ore finding work is broken through, the cooperative development, the overall planning and the consideration of various energy mineral products in a sedimentary basin are established, the ore finding capability is continuously improved, the major breakthrough of the exploration of the energy mineral products is realized, the repeated waste of manpower, financial resources and material resources required by exploration research is avoided, and the wide prospect of the comprehensive ore finding of the various energy mineral products is displayed.
However, because the drilling information of the coal field mainly focuses on the buried depth and thickness of the coal seam, the information such as the thickness, color, lithologic structure and the like of sand in the stratum is general, and the sandstone-type uranium mineralization environment where the drilling hole is located is difficult to accurately determine; and the radioactive logging of the coal field drilling is mainly natural gamma logging, and only can reflect the relative level of radioactivity. Therefore, at present, whether the coal field drill hole has three times of the gamma mean value or not is mainly checked to extract the abnormity, the lithology of the abnormal section is not concerned, and then the indication significance of whether the sandstone-type uranium ore has is explained. Therefore, a lot of key sandstone type uranium mineralization information is lost, true and false anomalies are not distinguished, and inaccurate uranium mineralization is indicated.
Therefore, it is highly desirable to develop a method for rapidly localizing sandstone-type uranium mineralization by using drilling information.
Disclosure of Invention
The invention aims to provide a method for quickly positioning sandstone-type uranium mineralization by using coal field drilling information.
The technical scheme for realizing the purpose of the invention is as follows: a method for rapidly positioning sandstone-type uranium mineralization by utilizing coal field drilling information comprises the following steps:
analyzing the stratum structure of a drilling area of a coal field, checking the stratum color and identifying a target layer containing ores;
step (2), analyzing the resistivity information of the ore-containing target layer to determine a favorable deposition environment;
analyzing a natural gamma logging curve in a coal field borehole in the favorable deposition environment, and determining an oxidation-reduction transition zone;
step (4), setting a soil radon gas profile in the redox transition zone, measuring the soil radon gas value, and positioning a uranium mineralization part;
and (5) drilling and checking, and determining a uranium mineralization position.
Further, the step (1) includes:
step (1.1), analyzing and determining whether a stratum structure of a drilling area of a coal field has deposition discontinuity;
and (1.2) checking whether a gray or black stratum exists in the deposition interruption.
Further, the deposition-favorable environment in step (2) includes: braided river channel deposition environment, meandering river channel deposition environment, delta plain deposition environment, and delta front edge deposition environment.
Further, the step (3) includes:
step (3.1), determining an oxidation-reduction transition zone according to the distance between the natural gamma logging curve and an etched source zone without abnormity;
and (3.2) determining the oxidation-reduction transition zone according to the abnormal generation position when the natural gamma logging curve is more than three times abnormal.
Further, the step (3.2) comprises:
step (3.2.1), if the abnormal product is produced in the mudstone, determining that the condition is an oxidation zone environment;
and (3.2.2) if the abnormal product is produced in the sandstone, determining an oxidation-reduction transition zone according to the abnormal grade and the amount of the square meter uranium.
Further, the step (4) includes:
step (4.1), setting a soil radon gas profile in the redox transition zone, setting a point distance for measuring soil radon gas, and measuring a soil radon gas value;
step (4.2), determining abnormal points according to the measured radon gas value of the soil;
and (4.3) determining the region between the two abnormal points as a sandstone-type uranium mineralization favorable part.
Further, the point distance of measuring soil radon gas in the step (4.1) is 100 m.
Further, the abnormal point in the step (4.2) is that the radon gas value of the soil is more than 10000bq/m3And (4) measuring points.
The invention has the beneficial technical effects that:
1. the method for rapidly positioning sandstone-type uranium mineralization by using coal field drilling information accurately, efficiently and rapidly positions sandstone-type uranium mineralization by using resistivity and natural gamma well logging curve information of coal field drilling;
2. the method for rapidly positioning sandstone-type uranium mineralization by using coal field drilling information avoids repeated waste of manpower, financial resources and material resources required by exploration research, and shows a wide prospect of comprehensive coal-uranium ore prospecting.
Drawings
FIG. 1 is a flow chart of a method for rapidly locating sandstone-type uranium mineralization by using coal field drilling information, provided by the invention;
FIG. 2 is a diagram illustrating the deposition environment of the bore hole of the two-link basin trunk-checking depression Y0833 coal field and the bore hole of the Y0829 coal field in example 1 of the present invention;
fig. 3 is an explanatory diagram of an mineralization environment of a dulian basin trunk-finding depression Y0833 coal field borehole and a Y0829 coal field borehole in embodiment 1 of the present invention;
fig. 4 is a view showing determination of sandstone-type uranium mineralization sites of the duplet basin trunk-finding depression Y0833 coal field borehole and Y0829 coal field borehole in embodiment 1 of the present invention;
fig. 5 is a diagram illustrating the effect of examining the depressed uranium mineralization part in the diclavian basin in the invention in example 1.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the method for rapidly locating sandstone-type uranium mineralization by using coal field drilling information provided by the invention comprises the following steps:
step (1), analyzing the stratum structure of a drilling area of a coal field, checking the stratum color, and identifying a target layer containing ores
Step (1.1), analyzing and determining whether the stratum structure of the drilling area of the coal field has deposition discontinuity
The system analyzes the stratum structure of the coal field drilling area, finds out whether the sedimentary strata has deposition discontinuity, if so, the lower horizon of the deposition discontinuity may be a target horizon; if not, the area has no sandstone-type uranium mineralization potential.
Step (1.2), checking whether a gray or black stratum exists in the deposition interruption
Checking whether a gray or black stratum exists in the position below the deposition discontinuity, and a red or variegated stratum exists on the upper part of the gray stratum, wherein the gray or black stratum is a sandstone-type uranium ore target-containing layer; if the gray stratum is not seen, the mining possibility is temporarily not considered in the area.
Step (2) analyzing the resistivity information of the ore-containing target layer to determine whether the deposition environment is favorable
And (3) analyzing the resistivity information of the ore-containing target layer identified in the step (1), and determining the favorable deposition environment according to the resistivity information corresponding to the deposition environment favorable for sandstone-type uranium mineralization. The deposition environment and its corresponding resistivity information are as follows:
(2.1) deposition environment of alluviation fan: the resistivity curve is sparse high resistance.
(2.2) braided river channel sedimentation environment: the resistivity curve is box-shaped; the deposition environment of the meandering river channel: the resistivity curve appears as a box or bell.
(2.3) delta plain deposition environment: the resistivity curve is an irregular box type, bell shape and finger-shaped negative anomaly combination; delta front deposition environment: the resistivity curve is a combination of small irregular bell, finger and funnel negative anomalies.
(2.4) lake deposition environment: the resistivity curve is flat.
Determining the deposition environment of the braided river channel, the meandering river channel, the delta plain deposition environment and the delta leading edge deposition environment as the deposition environment beneficial to sandstone-type uranium mineralization, and determining whether the deposition environment is the deposition environment beneficial according to resistivity information corresponding to the deposition environment of the braided river channel, the meandering river channel, the delta plain deposition environment and the delta leading edge deposition environment.
Step (3) analyzing a natural gamma logging curve in the coal field borehole in the favorable deposition environment to determine an oxidation-reduction transition zone
And (3) analyzing a natural gamma logging curve in the coal field borehole in the environment beneficial to sandstone-type uranium mineralization deposition determined in the step (2), and determining an mineralization environment, namely a sandstone-type uranium ore oxidation-reduction transition zone, according to the natural gamma logging curve corresponding to the mineralization environment. The natural gamma well logging curve corresponding to the mineralization environment is as follows:
step (3.1), determining the oxidation-reduction transition zone according to the distance from the corrosion source zone without abnormity of the natural gamma logging curve
If the natural gamma logging curve is relatively straight and abnormal, considering the distance between the natural gamma logging curve and an erosion source region, and if the natural gamma logging curve is relatively short (less than 2km), determining that the natural gamma logging curve is a complete oxidation zone environment; if the distance is far (more than 2km), the original zone environment is determined.
And (3.2) determining the redox transition zone according to the abnormal generation position when the natural gamma logging curve shows more than three times of abnormality (including three times of abnormality). The specific ore-forming environment analysis is as follows:
and (3.2.1) if the abnormal occurrence is in the mudstone, determining that the situation is an oxidation zone environment, and the sandstone-type uranium ore oxidation-reduction transition zone is located at the downstream of the hole and has a distance larger than 500 m.
Step (3.2.2), if the abnormal product is produced in the sandstone, analyzing the abnormal scale, and determining the redox transition zone according to the abnormal grade and the amount of uranium in square meters
Because the natural gamma logging curve units of the coal field drilling holes are different, the conversion relationship among the natural gamma logging curve units is as follows:
1pA/kg＝13.947γ
1nC/kg.h＝3.876γ
1pA/kg＝3.598nC/kg.h
1cps(API)＝0.333γ
0.01% uranium content 100 gamma
Wherein, the content of 0.01 percent uranium is 100 gamma, or 7.1pA/kg, or 300cps, or 300API, or 25.4nC/kg.h, the content of boundary square meter uranium is 1kg/m as boundary grade of industrial uranium ore hole2。
If the abnormal grade reaches more than 0.01 percent, the amount of uranium per square meter reaches 1kg/m2Determining the uranium industrial hole; if the grade of the boundary and the amount of the boundary square meter uranium only reach one item, determining the boundary is a uranium mineralization hole; both can be determined as sandstone-type uranium ore oxidation-reduction transition zones.
If the boundary grade and the boundary perennial uranium amount are not reached, but the dual-peak abnormity appears, the weak oxidation zone is determined, and the sandstone-type uranium ore oxidation-reduction transition zone is positioned at the downstream of the hole, and the distance is less than 500 m.
And if the boundary grade and the boundary square meter uranium amount are not reached, but a single-peak abnormity is presented, and the abnormal thickness is larger, determining that the environment is an original zone environment, and the sandstone-type uranium ore oxidation-reduction transition zone is positioned at the upstream of the hole and has a distance of less than 500 m.
Step (4), a soil radon gas profile is arranged in the redox transition zone, the soil radon gas value is measured, and the uranium mineralization part is positioned, wherein the soil radon gas profile specifically comprises the following steps:
step (4.1), setting a soil radon gas profile in the redox transition zone, setting the point distance of measuring soil radon gas as 100m, and measuring the soil radon gas value;
step (4.2) according to the measured soil radon gas value, the soil radon gas value is larger than 10000bq/m3Determining the measuring points as abnormal points;
and (4.3) determining a clamping area between the double peaks formed by the two abnormal points as a sandstone-type uranium mineralization favorable part.
Step (5) drilling and checking, and determining uranium mineralization position
And (4) drilling and setting a verification hole at the sandstone-type uranium mineralization part determined in the step (4) to implement uranium mineralization.
Example 1 takes a two-link basin dry pit detection as an example, and uses coal field drilling information to position sandstone-type uranium mineralization, and the specific steps are as follows:
step (1), analyzing the stratum structure of a drilling area of a coal field, checking the stratum color, and identifying a target layer containing ores
The two-basin dry-check depression has a large number of coal field drill holes, and the stratum disclosed by the coal field drill holes has a Chachal Hipposhu group and a New Tunhuma group. Wherein about 60Ma deposition discontinuity exists between the Sehan group and the Iltmanhaha group, and the Sehan group is a gray stratum and the Iltmanhaha group is a variegated stratum.
Thus, the group of Saohan was identified as the mineral bearing target layer of the trunk pit.
Step (2), analyzing the resistivity information of the ore-containing target layer to determine favorable deposition environment
FIG. 2 is a diagram illustrating the deposition environment of a twin basin trunk pit Y0833 coal field borehole and a Y0829 coal field borehole, wherein 1-original New Tulban group; 2-upper part of the lower chalky group; 3-lower part of the lower chalky group; 4-etching the source region; 5-river subphase; 6-delta phase; 7-angle unconformity; 8-sedimentary phase boundary; 9-resistivity curve; 10-drilling the coal field.
As shown in fig. 2, the resistivity of the drilled holes of the dupely trunk-checking pit Y0833 coal field and the drilled hole of the Y0829 coal field are both box-shaped, which is the deposition environment of the braided river channel and is beneficial to formation of sandstone-type uranium ores.
Therefore, the two-basin trunk-checking depression Y0833 coal field borehole and Y0829 coal field borehole Sehan group section are favorable deposition environments.
Step (3) analyzing a natural gamma logging curve in the coal field borehole in the favorable deposition environment to determine an oxidation-reduction transition zone
FIG. 3 is an illustration of an ore-forming environment for a Queen basin trunk-finding depression Y0833 coal field borehole and a Y0829 coal field borehole, wherein the 1-eroded source zone; 2-river subphase; 3-delta phase; 4-oxidation zone; 5-redox transition zone; 6-mudstone; 7-angle unconformity; 8-front edge of oxidation zone; 9-resistivity curve; 10-natural gamma log; 11-drilling of coal field.
As shown in fig. 3, the second-connected basin trunk-checking depression Y0833 coal field drilling seihan group segment natural gamma logging curve is straight and straight, is close to the corrosion source, and is determined as a complete oxidation zone; the natural gamma logging curve of the Y0829 coal field drilling hole Sihan group section is abnormal in mudstone and is determined as a weak oxidation zone mineralization environment, and the oxidation-reduction transition zone is positioned in a section more than 500m downstream of the hole.
Step (4), setting a soil radon gas profile in the redox transition zone, measuring the soil radon gas value, and positioning the uranium mineralization part
FIG. 4 is a view of sandstone-type uranium mineralization site determination in a twin basin trunk pit Y0833 coal field borehole and a Y0829 coal field borehole, wherein the 1-erosion zone; 2-river subphase; 3-delta phase; 4-sandstone-type uranium mineralization site; 5-soil radon gas curve; 6-measuring a section of soil radon gas; 7-drilling the coal field.
As shown in fig. 4, a soil radon gas profile is set in the trunk-finding depression redox transition zone determined by using the Y0833 coal field borehole and the Y0829 coal field borehole; through measurement, the radon value of the soil in the region is high and is mostly 10000bq/m3The radon gas height in the areas 200-600 meters and 1600-2000 meters downstream of Y0829 is abnormal, and the abnormal value reaches 30000bq/m3And the area clamped by the two pieces of high abnormal values, namely the area 600-1600 m downstream of Y0829 is determined as the sandstone-type uranium mineralization favorable part.
Step (5) drilling and checking, and determining uranium mineralization position
FIG. 5 is a diagram showing the effect of examining the depressed uranium mineralization part in the two-link basin, wherein, 1-etching source region; 2-river subphase; 3-delta phase; 4-oxidation zone; 5-redox transition zone; 6-mudstone; 7-uranium mineralized bodies; an 8-uranium mineralization site; 9-front edge of oxidation zone; 10-resistivity curve; 11-natural gamma log; 12-drilling a coal field; 13-verifying the wells.
As shown in figure 5, Y01 holes are arranged at the uranium mineralization part determined by the dry check pit of the dicy basin for checking, and the result shows that 1 uranium ore reaches 0.0176 percent and the amount of uranium planum is 1.2kg/m2The uranium industrial hole shows that the area has better uranium ore-forming prospect and is defined as a sandstone-type uranium ore prospecting target area.
The present invention has been described in detail with reference to the drawings and examples, but the present invention is not limited to the 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. The prior art can be adopted in the content which is not described in detail in the invention.
Claims (8)
1. A method for rapidly positioning sandstone-type uranium mineralization by using coal field drilling information is characterized by comprising the following steps:
analyzing the stratum structure of a drilling area of a coal field, checking the stratum color and identifying a target layer containing ores;
step (2), analyzing the resistivity information of the ore-containing target layer to determine a favorable deposition environment;
analyzing a natural gamma logging curve in a coal field borehole in the favorable deposition environment, and determining an oxidation-reduction transition zone;
step (4), setting a soil radon gas profile in the redox transition zone, measuring the soil radon gas value, and positioning a uranium mineralization part;
and (5) drilling and checking, and determining a uranium mineralization position.
2. The method for rapidly localizing sandstone-type uranium mineralization according to claim 1, wherein the step (1) comprises:
step (1.1), analyzing and determining whether a stratum structure of a drilling area of a coal field has deposition discontinuity;
and (1.2) checking whether a gray or black stratum exists in the deposition interruption.
3. The method for rapidly locating sandstone-type uranium mineralization according to claim 1, wherein the favorable deposition environment in the step (2) comprises: braided river channel deposition environment, meandering river channel deposition environment, delta plain deposition environment, and delta front edge deposition environment.
4. The method for rapidly localizing sandstone-type uranium mineralization according to claim 1, wherein the step (3) comprises:
step (3.1), determining an oxidation-reduction transition zone according to the distance between the natural gamma logging curve and an etched source zone without abnormity;
and (3.2) determining the oxidation-reduction transition zone according to the abnormal generation position when the natural gamma logging curve is more than three times abnormal.
5. The method for fast localization of sandstone-type uranium mineralization according to claim 4, wherein the step (3.2) comprises:
step (3.2.1), if the abnormal product is produced in the mudstone, determining that the condition is an oxidation zone environment;
and (3.2.2) if the abnormal product is produced in the sandstone, determining an oxidation-reduction transition zone according to the abnormal grade and the amount of the square meter uranium.
6. The method for rapidly localizing sandstone-type uranium mineralization according to claim 1, wherein the step (4) comprises:
step (4.1), setting a soil radon gas profile in the redox transition zone, setting a point distance for measuring soil radon gas, and measuring a soil radon gas value;
step (4.2), determining abnormal points according to the measured radon gas value of the soil;
and (4.3) determining the region between the two abnormal points as a sandstone-type uranium mineralization favorable part.
7. The method for rapidly locating sandstone-type uranium mineralization according to claim 6, wherein the point distance for measuring soil radon gas in the step (4.1) is 100 m.
8. The method for rapidly positioning sandstone-type uranium mineralization according to claim 6, wherein the anomaly point in the step (4.2) is that the radon gas value of soil is more than 10000bq/m3And (4) measuring points.
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| CN114609683A (en) * | 2022-03-15 | 2022-06-10 | 核工业北京地质研究院 | Method and system for determining advantageous sand zone of sandstone-type uranium ore |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113279748A (en) * | 2021-06-21 | 2021-08-20 | 吉林大学 | Method for identifying zonal uranium-bearing layers of vertical underground space of computer |
| CN113279748B (en) * | 2021-06-21 | 2022-04-29 | 吉林大学 | Method for identifying zonal uranium-bearing layers of vertical underground space of computer |
| CN114609683A (en) * | 2022-03-15 | 2022-06-10 | 核工业北京地质研究院 | Method and system for determining advantageous sand zone of sandstone-type uranium ore |
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