WO2023000257A1

WO2023000257A1 - Geological-seismic three-dimensional prediction method for favorable metallogenic site of sandstone-type uranium deposit

Info

Publication number: WO2023000257A1
Application number: PCT/CN2021/107865
Authority: WO
Inventors: 李子颖; 吴曲波; 刘武生; 秦明宽; 汪硕; 李西得; 刘持恒; 李伟涛; 张玉燕
Original assignee: 核工业北京地质研究院
Priority date: 2021-07-22
Filing date: 2021-07-22
Publication date: 2023-01-26

Abstract

A geological-seismic three-dimensional prediction method for a favorable metallogenic site of a sandstone-type uranium deposit, comprising: determining an area to be explored and a target layer in the area to be explored; setting a seismic line in the area to be explored, to acquire seismic data of a profile where the seismic line is located; delineating a depression region and a target region in the profile; determining a dip angle of the stratum in the target region and a dip angle of a stratum underlying the target region according to the seismic data, where the stratum underlying the target region is within the depression region; determining a distribution of fractures in the target region and the depression region according to the seismic data; and delineating a uranium deposit metallogenic site in the target region. The present geological-seismic three-dimensional prediction method for a favorable metallogenic site of a sandstone-type uranium deposit can efficiently and accurately predict a distribution area of uranium ore.

Description

A Geological-Seismic 3D Prediction Method for Favorable Ore-forming Sites of Sandstone-type Uranium Deposits

technical field

The invention relates to the technical field of geological information, in particular to a geological-seismic three-dimensional prediction method for a sandstone-type uranium ore-forming favorable site.

Background technique

Uranium is the material basis of the field of nuclear industry technology and other fields, so the exploration and prediction of uranium ore is particularly important. Sandstone-type uranium deposits have the characteristics of large scale, no tailings, and good economic benefits. In this field, the prediction of the distribution area of uranium deposits is mainly aimed at sandstone-type uranium deposits. The formation of sandstone-type uranium deposits is subject to various geological factors. There are many ore-controlling factors, the ore-forming process is complex, and most of them are blind mines. Therefore, it is difficult to predict. A method that can effectively predict the distribution area of uranium deposits is needed.

Contents of the invention

In view of the above problems, the present invention is proposed to provide a method for predicting uranium ore-forming sites using geological and seismic data that overcomes the above problems or at least partially solves the above problems.

According to an embodiment of the present invention, there is provided a method for predicting a uranium ore-forming site using geological and seismic data, including: determining the area to be surveyed and the target layer in the area to be surveyed; setting a seismic line in the area to be surveyed, Obtain the seismic data of the section where the seismic line is located; delineate the subsidence area and the target area in the section, wherein the target area is in the target layer, and the subsidence area lies under the target area, the depression area and the target area meet the following conditions: the buried depth of the target area is less than 400 meters, the thickness of the depression area is greater than 1000 meters, and the thickness of the depression area is the same as that of the depression The ratio of the total thickness of the subsidence area to the upper formation is greater than 0.6; the dip angle of the formation in the target area and the dip angle of the formation underlying the target area are determined according to the seismic data, and the dip angle of the formation underlying the target area is determined according to the seismic data. The stratum is within the sag area; the target area and the distribution of faults in the sag area are determined according to the seismic data; the uranium ore-forming site is delineated in the target area, and the uranium ore-forming The position satisfies the following conditions: the stratum dip angle of the uranium ore-forming part is less than 15 degrees, the dip angle of the stratum underlying the uranium ore-forming part is greater than 20 degrees, and distribution of Regional breaks.

The method for predicting the ore-forming location of uranium ore using geological and seismic data according to the embodiment of the present invention can efficiently and accurately predict the distribution area of uranium ore.

Description of drawings

Fig. 1 is a flowchart of a method for predicting a uranium ore-forming site using geological and seismic data according to an embodiment of the present invention;

2 is a schematic diagram of an area to be surveyed and a seismic survey line according to an embodiment of the present invention;

3A and 3B are seismic interpretation diagrams and geological strata and fault interpretation diagrams of seismic data according to an embodiment of the present invention;

Fig. 4 is a schematic diagram of a three-dimensional region of uranium mineralization according to an embodiment of the present invention.

detailed description

In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Apparently, the described embodiment is one embodiment of the present invention, but not all of them. Based on the described embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by those skilled in the art to which the present invention belongs. If the descriptions such as "first" and "second" are involved in the whole text, the descriptions such as "first" and "second" are only used to distinguish similar objects, and cannot be understood as indicating or implying their relative importance, sequence, etc. The order or the number of technical features indicated by implicit indication should be understood as "first", "second" and other described data can be interchanged under appropriate circumstances. If "and/or" appears throughout the text, it means to include three parallel plans, taking "A and/or B" as an example, including plan A, or plan B, or a plan that satisfies both A and B. In addition, for ease of description, spatially relative terms, such as "above", "below", "top", "bottom", etc., may be used herein to describe only one device or feature as shown in the figures in relation to other devices or features. The spatial relationship of features should be understood to also encompass different orientations in use or operation than those shown in the figures.

According to an embodiment of the present invention, a method for predicting a uranium ore-forming site using geological and seismic data is provided, referring to FIG. 1 , comprising the following steps:

Step S102: determining the area to be surveyed and the target layer in the area to be surveyed;

Step S104: setting a seismic line in the area to be surveyed, and acquiring seismic data of the section where the seismic line is located;

Step S106: Delineate the depression area and the target area in the profile, wherein the target area is in the target layer, the depression area lies under the target area, and the depression area and the target area meet the following conditions: the buried area of the target layer in the target area The depth is less than 400 meters, the thickness of the formation below the target layer in the subsidence area is greater than 1,000 meters, and the ratio of the thickness of the formation in the subsidence area to the total thickness of the subsidence area and the above formation is greater than 0.6;

Step S108: Determine the dip angle of the strata in the target area and the dip angle of the strata underlying the target area according to the seismic data, wherein the stratum underlying the target area is in the depression area;

Step S110: determining the distribution of faults in the target area and the subsidence area according to the seismic data; and

Step S112: delineate the uranium ore-forming site in the target area, and the uranium ore-forming site meets the following conditions: the dip angle of the target formation at the uranium ore-forming site is less than 15 degrees, and the dip angle of the underlying strata at the uranium ore-forming site is greater than 20° The degree and distribution of faults from the subsidence area to the target area.

In step S102, the target layer in the area to be surveyed and the area to be surveyed can first be determined. With reference to FIG. It may include the surface within the delineated range and all geological structures below the surface, that is, the area to be surveyed 10 may include multiple strata.

Referring to Fig. 3A and Fig. 3B, the target layer 20 may be a certain stratum in the area 10 to be surveyed, and the formal lithostratigraphic unit is a group, group, section, layer, etc. which are divided, defined and formally named according to the stratum sequence and unified rules. , a certain stratum and different strata described above may refer to strata of different sections or strata of different groups, etc. A section is a unit of rock stratum that is lower than a group and higher than a stratum, and a formally named section must have the same Adjacent rock formations have distinctly different lithological characteristics and are widely distributed, representing a section of strata with obvious lithological characteristics within a group, that is, the area to be surveyed 10 may include multiple groups, and multiple groups may include multiple sections respectively , the target layer 20 in the present invention may be one of the segments. Although the uranium ore distribution area prediction method of the embodiment of the present invention can theoretically be applied to an arbitrarily delineated area 10 to be surveyed, it is very likely that there is no possibility of uranium ore distribution in any delineated area 10 to be surveyed. It is meaningless to carry out subsequent steps in the area to be surveyed 10, so in the actual work process, those skilled in the art can determine the uranium prospecting area that has been published in the geological data and investigation data as the area to be surveyed 10, such a field to be surveyed There is a large probability of uranium ore distribution in the area 10, but it is not clear where the uranium ore is specifically distributed. In such an area 10 to be surveyed, the method provided by the embodiment of the present invention can be used to predict the specific distribution of uranium ore. predictive efficiency.

In some embodiments, since in step S106 it is necessary to delineate the subsidence area and the target area in the section where the seismic survey line is located, therefore, when determining the area 10 to be surveyed in step S102, it is possible to first search for the presence of depressions based on geological data, etc. area, and further determined the structure, basement depth, and spatial distribution of the depression, as well as the division of sedimentary strata, sedimentary facies, and rock formation characteristics in this area. Based on these data, it is preliminarily judged that there may be uranium deposits in this area. After that, it is delineated as the area 10 to be surveyed.

Similarly, the target layer 20 can be the section where uranium ore is most likely to be distributed in the area to be surveyed 10. After the area to be surveyed 10 is determined according to the geological data, it can further be based on the above geological data and in combination with the ore-forming conditions of the uranium ore. To determine the target layer 20 most likely to have uranium ore distribution in the area 10 to be surveyed. Of course, in some embodiments, those skilled in the art may first obtain a certain target layer 20 that may have a uranium ore distribution. At this time, the stratum distribution at the position of the target layer 20 can be determined according to the geological background material, and the target layer below the target layer The region to be surveyed 10 is determined in the region where the depression exists, that is, the target layer 20 is determined first, and then the region to be surveyed 10 is determined according to the target layer 20 .

In some specific embodiments, the inventors conducted actual surveys at the Saihan Gaobi uranium deposit in the Erlian Basin. Still referring to Fig. 2, it is a stratum contour map in the target area. Points with the same depth are connected to form a closed curve, so that it can be seen intuitively where there is a depression in the area, such as the area to be surveyed 10 delineated by the dotted line in the figure. Further, in this specific embodiment, still referring to FIG. 3A and FIG. 3B , the inventor determined the target layer 20 to be k ₁ s ² in the upper member of the Saihan Formation by referring to geological data.

Several methods for determining the region to be surveyed 10 and the target layer 20 have been described above. However, it can be understood that the determination of the region to be surveyed 10 and the target layer 20 in step S102 is actually to determine the working range of the subsequent steps. The range determined The more appropriate, the higher the efficiency of prediction in the subsequent steps. Those skilled in the art can use any suitable method to determine the area to be surveyed 10 and the target layer 20, and can even be based on the prediction results obtained by existing prediction methods Determine the target layer 20 above, and then use the prediction method of the embodiment of the present invention to further predict to obtain a more accurate uranium ore distribution area, which will not be repeated here.

In step S104, a seismic line is set in the area to be surveyed 10, and seismic data of a section where the seismic line is located is acquired. The seismic survey line can be the seismic survey line in the two-dimensional seismic survey system commonly used in this field. Still referring to FIG. The seismic source can be used at the shot point to induce seismic waves, and the receiving point is used to receive the reflected seismic waves, so as to obtain the seismic data at the section where the seismic line 30 is located.

In some embodiments, multiple seismic lines 30 may be set in step S104, and the relevant steps described below may be used to predict the uranium ore-forming position in the section where each seismic line is located.

In the embodiment in which a plurality of seismic lines 30 are set, still referring to FIG. axis distribution. In some embodiments, the intervals between the multiple seismic lines 30 are the same, that is, the multiple seismic lines 30 are uniformly arranged along the long axis of the region to be surveyed 10, and the interval between every two adjacent seismic lines 30 is The distance is the same. In some embodiments, the distance between every two adjacent seismic survey lines 30 can also be different. For example, when it is determined in advance according to the geological data etc. Seismic lines 30 can be densely arranged at this location, and those skilled in the art can set them according to actual needs, so details will not be repeated here.

The section where the seismic line 30 is located usually refers to the vertical plane passing through the seismic line 30. After the seismic data are acquired by earthquakes in step S104, the seismic data can be preprocessed first, for example, CGG and Geoeast seismic processing software can be used to process the seismic data. The raw data obtained by the seismic process are subjected to refined processing such as filtering, amplitude recovery, and denoising processing, and the refined processed seismic data can be further interpreted by Landmark interpretation software, geoview inversion software, etc., for stratigraphic interpretation, fault interpretation, and sand Obtain the stratum depth data, fault interpretation data and sand body distribution data of the section where the seismic survey line is located, so as to determine the shape of the sag, basement depth, stratum development and occurrence, stratum occurrence and distribution, etc. , in some embodiments, the seismic interpretation map shown in Figure 3A can be obtained after stratum interpretation, and those skilled in the art can further draw the geological formations and faults shown in Figure 3B according to the seismic interpretation map in Figure 3A Interpret graphs for better subsequent analysis.

It should be noted that although the relevant steps below are described in detail using Fig. 3A and Fig. 3B as an example, these steps do not rely on the stratigraphic interpretation diagrams and schematic diagrams shown in Fig. 3A and Fig. 3B, but only rely on Based on the original seismic data, those skilled in the art can use any suitable method to process the original data to realize the relevant steps below, which is not specifically limited.

In step S106, it is necessary to determine the depression area and the target area in the section where the seismic line 30 is located. The target area is an area in the target layer, and the subsidence area is an area below the target area. As described above, the subsidence area and the target area need to meet the following requirements: the buried depth of the target layer in the target area is less than 400 meters, The formation thickness below the target layer in the depression area is greater than 1000 meters, and the ratio of the formation thickness in the depression area to the total thickness of the formation thickness in the depression area and above is greater than 0.6.

Figure 3B shows the target area 41 and the depressed area 42 determined in a specific embodiment. In some embodiments, the depressed area 42 can be delineated first, and then the target area 41 in the target layer 20 can be delineated. Specifically Specifically, as described above, the target layer 20 can be a section of stratum, such as the upper member k ₁ s ² of the Saihan Formation shown in Figures 3A and 3B, when delineating the depression area 42, the depression area 42 can include A plurality of formations. In actual work, the thickness of formations at various positions below the target layer 20 in the profile can be determined, for example, it can be determined according to the seismic data described above, so as to delineate a region with a thickness greater than 1000 meters, which can be It is understood that such a region generally exhibits a "V" or "U" shape, and the thickness of the region may refer to the distance from the bottom to the top of the "V" or "U" shaped region. After the area with a thickness greater than 1000 meters is delineated, the ratio between the thickness of the area and the total thickness of the strata above the area is further judged. If it is greater than 0.6, it can be determined as the subsidence area 42 .

The depression area 42 may include multiple stages or even multiple groups of strata. For example, in the specific embodiment shown in Fig. 3A and Fig. 3B, a depression area 42 includes the lower section k ₁ s of the Saihan Formation from top to bottom. ^1. The k ₁ t ² upper member of the tengger formation, the k ₁ t ¹ lower member of the tengger formation, and the k ₁ a formation of the alshan formation.

In some embodiments, when delineating the depression area and the target area, a condition that needs to be met is that reducing formations or reducing organic-rich formations are developed in the depression area. Reductive formations can be the formations developed with gray rock series, gray-black rock series and other reducing rock series, such as coal measures or hydrocarbon source rock series formations producing oil and gas, and reducing organic-rich formations and other organic-rich formations, such as For formations where the content of organic matter is greater than a predetermined value, those skilled in the art can determine the predetermined value according to actual conditions. Such reducing formations can provide reducing agents for the formation of uranium ore, so they can be used as one of the favorable ore-forming factors. In such an embodiment, after the depression area 42 is delineated, the occurrence characteristics of each stratum can be further determined, for example, it can be determined through the seismic data described above, or it can be determined by consulting geological data. In this embodiment, if no reductive formations are developed in the delineated depression area 42 , or the proportion of the reduction formations is relatively low, then it is no longer delineated as the depression area 42 . In some other embodiments, the reducing formations below the target layer 20 may also be determined first, and then the depression region 42 is determined according to the thickness of these reducing formations. A person skilled in the art can make a selection according to actual conditions, and no specific limitation is set here.

The subsidence area 42 means sedimentary structural evolution, which plays an obvious role in controlling the formation of uranium deposits, accumulation of mineralization, and later transformation, so the target area is delineated above such a subsidence area 42 41.

Because the target layer in the target area 41 needs to meet the buried depth less than 400 meters, therefore, when delineating the target area 41, the area above the depression area 42 can be delineated in the target layer at first, such as delineating the area corresponding to the depression in the target layer 20 The area between the two sides of the subsidence area 42, and then further determine the buried depth of the target layer in this area based on, for example, seismic data, etc., and delineate the area where the buried depth of the target layer is less than 400 meters in this area as the target area 41.

In some embodiments, since sandstone-type uranium deposits are formed in sand bodies, when delineating the target area 41, the following conditions may be further satisfied: sand bodies are developed in the target area. Specifically, the wave resistance inversion calculation can be performed on the seismic data to obtain the distribution of sand bodies in the target layer 20, and then, when delineating the target area 41, the area with a buried depth of less than 400 meters and developed sand bodies is delineated as the target Area 41 makes the prediction of uranium ore-forming sites more accurate.

A variety of methods for delineating the target area 41 and the depressed area 42 have been described in the above embodiments, and those skilled in the art can use a combination of one or more of the above methods to delineate the target area 41 and the depressed area 42, or Select any other suitable method to determine, only need to finally delineate the target area 41 and the subsidence area 42 to meet: the buried depth of the target area is less than 400 meters, the thickness of the subsidence area is greater than 1000 meters, and the thickness of the subsidence area is the same as The ratio of the total thickness of the subsidence area to the upper formation is greater than 0.6, and in some embodiments, it can further satisfy: the reduction formation is developed in the subsidence area, and the sand body is developed in the target area.

After the target area 41 and the depression area 42 are delineated, in step S108, the dip angles of strata in the target area and the dip angles of strata underlying the target area are determined according to the seismic data. The dip angle of the formation refers to the angle between the strike of the formation and the horizontal line. In some embodiments, the formation interpretation can be performed on the seismic data, and the formation interpretation data of the target area 41 and the depression area 42 are obtained, and then according to the formation interpretation The data acquires the above-mentioned dip angle of the stratum, and those skilled in the art may also choose other suitable methods to acquire the dip angle of the stratum, which is not specifically limited.

Referring still to Fig. 3A and Fig. 3B, the depression region 42 may include multiple formations, such as k ₁ s ¹ in the lower part of the Saihan Formation, k 1 t 2 in the upper part of the Tengger Formation, and k ₁ t ² in the upper part of the Tengger Formation shown in Fig. 3B The lower section k ₁ t ¹ , the Aershan Formation k ₁ a, the stratum underlying the target area 41 refers to the stratum below the target layer in the target area 41 (k ₁ s ² in the upper section of the Saihan Formation) and the stratum in the target area 41 There may be multiple such formations in the depression area 42, such as k ₁ s ¹ in the lower part of the Saihan Formation, k ₁ t ² in the upper part of the Tengger Formation, k ₁ in the lower part of the Tengger Formation shown in Figure 3B t ¹ and Aershan Formation k ₁ a all have parts in contact with the upper member of the Saihan Formation k ₁ s ² in the target area 41. Therefore, the formation dip angles at these positions can be determined according to seismic data, and in the target area 41 The stratigraphic dips of the upper member k ₁ s ² of the target layer Saihan Formation at these positions.

Further, in step S110, the distribution of faults in the target area 41 and the subsidence area 42 is determined according to the seismic data. Based on the collected data in the past, the existence of most uranium deposits is closely related to the existence of underground faults, especially when the underground faults are from When the deep part extends upwards, it can provide uranium source from the deep part, provide the reducing agent required for ore formation, and carry out post-superposition reformation of uranium ore, etc. In some embodiments, the fracture distribution in the target area 41 and the subsidence area 42 can be obtained after fracture interpretation of the seismic data according to the method described above, which will not be repeated here.

In step S112, according to the inclination angle obtained in step S108 and the fracture distribution determined in step S110, the uranium ore-forming site is delineated in the target area. As described above, the uranium ore-forming site meets the following conditions: The dip angle of the target formation at the ore-forming site is less than 15 degrees, the dip angle of the strata underlying the uranium ore-forming site is greater than 20 degrees, and there are faults leading from the depression area to the target area.

Specifically, still referring to Fig. 3B, in order to search for uranium ore-forming sites satisfying the above conditions, one can first delineate k ₁ s ¹ in the lower part of the Saihan Formation, k ₁ t ² in the upper part of the Tengger Formation, and Teng The part where k ₁ t ¹ in the lower part of the Geer Formation, k ₁ a in the Arshan Formation and the upper part k ₁ s ² of the Saihan Formation in the target area 41 have an inclination angle greater than 20 degrees, and then further determine the target area according to the inclination angle obtained in step S108 The target layer k ₁ s ² in the upper section of the Saihan Formation is at the part where the inclination angle of this part is less than 15 degrees, and it is further judged according to step S110 whether there is a fault connected to the target area 41 by the subsidence area 42 at this part, if all satisfy , then it is determined that the site is a uranium ore-forming site, for example, the uranium ore-forming site 50 shown in FIG. 3B .

In the prediction method of the embodiment of the present invention, it is only necessary to arrange the seismic survey line and analyze the seismic data to predict the metallogenic location of the uranium ore, and the prediction efficiency is high. Moreover, the finally determined dip angle of the strata at the uranium ore-forming site is less than 15 degrees and the dip angle of the strata underlying the uranium ore-forming site is greater than 20 degrees, that is, the distance between the uranium ore-forming site and the underlying strata It presents a high-angle unconformity, and this high-angle unconformity makes the underlying formations beneficial to supply reducing agents to the upper formations. Furthermore, there are also faults leading from the subsidence area to the target area at the uranium ore-forming site, which makes it easier for the lower strata to provide reducing agents to the upper stratum. High, the prediction results are more accurate.

In some embodiments, as described above, multiple seismic lines can be arranged in step S104. In such an embodiment, the position of each seismic line at the profile can be determined according to the method described above. The uranium ore-forming site. Understandably, the uranium ore distribution area determined in each profile is actually a two-dimensional area, and uranium ore is usually continuously distributed in a certain area in three-dimensional space. For this, in some embodiments, refer to Fig. 4. After determining the distribution area of uranium ore in the section where each seismic line 30 is located, the uranium ore-forming sites 50 in each section can be connected to form a uranium deposit according to the positional relationship between the seismic lines 30. The three-dimensional area 60 of mineralization provides three-dimensional spatial data for subsequent mining. This step can be realized by, for example, the computer three-dimensional simulation software Gocad, etc., and will not be repeated here.

In the description of this specification, descriptions with reference to the terms "one embodiment", "some implementations", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims

A method for predicting uranium ore-forming sites using geoseismic data, comprising:

determining an area to be surveyed and a target layer in said area to be surveyed;

Setting a seismic line in the area to be surveyed, and acquiring seismic data of the section where the seismic line is located;

Delimiting the depressed area and the target area in the profile, wherein the target area is in the target layer, the depressed area lies under the target area, and the depressed area and the target area satisfy The following conditions: the burial depth of the target layer in the target area is less than 400 meters, the thickness of the formation below the target layer in the depression area is greater than 1000 meters, and the thickness of the formation in the depression area is the same as that of the depression area and the formation above The ratio of the total thickness is greater than 0.6;

determining the dip of formations in the target area and the dips of formations underlying the target area, the formations underlying the target area being within the depressed region, based on the seismic data;

determining the target area and the distribution of fractures in the depressed area based on the seismic data;

Delineate the uranium ore-forming site in the target area, and the uranium ore-forming site satisfies the following conditions: the target stratum dip angle of the uranium ore-forming site is less than 15 degrees, and lies beneath the uranium ore-forming site The dip angle of the formation is greater than 20 degrees, and there are fractures leading from the depression area to the target area.
The method according to claim 1, wherein, when delineating the depressed area and the target area in the profile, the depressed area and the target area also satisfy the following conditions:

Reductive formations or reductive organic-rich formations develop in the depression area.
The method according to claim 2, wherein the reducing formation or reducing organic-rich formation comprises at least one of the following:

Coal-producing strata, oil and gas-producing source rock series strata, and strata with organic matter content exceeding a predetermined value.
The method according to any one of claims 1-3, further comprising:

performing wave resistance inversion calculation on the seismic data to obtain sand body distribution data in the target layer;

When delineating the depressed area and the target area in the profile, the depressed area and the target area also meet the following conditions:

Sand bodies develop in the target area.
The method of claim 1 , wherein determining the dip of formations in the target area from the seismic data and the dips of formations underlying the target area comprises:

performing stratigraphic interpretation on the seismic data, and obtaining stratigraphic interpretation data of the target area and the subsidence area;

Determining dips of formations in the target area and dips of formations underlying the target area based on the formation interpretation data.
The method according to claim 1, wherein said setting a seismic line in the area to be surveyed comprises:

A plurality of seismic survey lines are set in the area to be surveyed, and each seismic survey line extends along the short axis of the area to be surveyed.
The method of claim 6, wherein a plurality of said seismic lines are arranged along the long axis of said area to be surveyed.
The method according to claim 6 or 7, wherein the intervals of the plurality of seismic lines are the same.
The method according to claim 6 or 7, wherein the spacing between the plurality of seismic lines is different.
The method according to any one of claims 6-9, further comprising:

Determining the uranium mineralization site in the profile where each said seismic survey line is located;

According to the positional relationship between the seismic survey lines, the uranium ore-forming sites in the section where each of the seismic survey lines are located are connected to obtain a three-dimensional area of uranium ore-formation.