Geochemical logging method and system for mineral exploration

Abstract

The invention discloses a geochemical logging method and system for mineral exploration, and the method comprises the steps: carrying out the drilling in a selected region, and continuously recording the hydrogen concentration and drilling footage depth at an orifice in real time during the drilling, and forming a first-class geochemical logging gas distribution diagram; after drilling is paused or completed, the hydrogen concentrations of different depths in the drill holes are measured, and a second-class geochemical logging gas distribution diagram is formed; analyzing the first type of geochemical logging gas distribution diagrams and the second type of geochemical logging gas distribution diagrams of the plurality of drill holes, and if the hydrogen concentration of at least one record is greater than a threshold value, taking the drill hole as an abnormal drill hole; analyzing the two types of distribution diagrams of the abnormal drill holes, determining the hydrogen source depth according to the abrupt change point of the hydrogen concentration, and determining the favorable prospecting position according to the hydrogen source depth. According to the method, the hydrogen concentration is measured based on the drill hole, the favorable prospecting position is speculated according to the hydrogen concentration, the method is not limited by depth, the prospecting precision is improved, and a new method and a new thought are provided for deep prospecting.

Description

Technical Field

[0001] This invention relates to the field of mineral exploration technology, and in particular to geochemical logging methods and systems for mineral exploration. Background Technology

[0002] Deep mineral resource exploration is an important research direction in the field of mineral resources. Unlike traditional shallow-covered area mineral exploration, deep-covered area mineral exploration is extremely difficult, and traditional geophysical and remote sensing exploration methods have limited effectiveness in deep-covered areas. Currently, several expert teams at home and abroad have proposed a variety of new methods for deep-covered areas. These technologies can be divided into two categories. One category focuses on analyzing trace metal ions / particles in soil, such as the Metal Active State Method (MMI) developed by AW Mann et al. at the Geochemical Research Centre of the University of Western Australia, the SIROGAS technology developed by Johnston et al. at CRISO Australia, the enzyme extraction technology (Enzyme Leach) developed by J. Robert Clark et al. at the Colorado School of Mines, and the NAMEG (Named Micrometals in Earth Gas) technology developed by the Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences. The other category focuses on analyzing gases present in soil, such as the multi-component gas analysis technology supervised by the Development and Research Center of the China Geological Survey.

[0003] Unlike the first type of technology, which primarily analyzes in-situ soil, the second type of technology studies specific gases from deep within the exploration area, and can therefore be called gas geochemical exploration. The first type of technology requires field sampling and transmission to a laboratory for analysis, which is costly and time-consuming. In contrast, the second type of technology can obtain results on-site using portable instruments, making it simple and efficient.

[0004] The applicant's team has practiced the aforementioned gas geochemical exploration technology in multiple known and unknown metal mining areas. Through extensive testing and analysis, they have discovered a significant correlation between gas concentration and underground metal mineral deposits. Specifically, the higher the concentration of a certain gas in the soil, the greater the likelihood of the presence of metal mineral deposits in that area.

[0005] Utilizing this principle, the applicant team discovered a "gas-based method for metal mineral exploration." This method allows explorers to evaluate the mineral potential of a work area by measuring the gas concentration in the surface soil. However, the method had two main problems at the time: (1) There was still room for improvement in accuracy. The explanation of the gas source was unclear, which meant that the method could only answer the question of "whether there is mineral deposit" at present, and could not further indicate the location, depth, scale, etc. of the deposit; (2) Depth was limited. Rocks with poor permeability would block the upward movement of deep gas, so surface measurements could only reveal shallower concealed deposits, and had limited indicative effect on deeper concealed ore bodies where associated gases could not reach the surface.

[0006] To improve the accuracy and depth of gas exploration methods, well logging technology is needed to penetrate surface rocks and measure deep gases. However, existing well logging technologies cannot meet this demand because traditional well logging used for metal mineral exploration is solid logging, including elemental logging and geophysical logging, which cannot be applied to volatile matter measurement. Mature gas logging technology, known as gas logging, exists in the oil and gas sector. However, this technology is complex to implement, requires more equipment, has specialized drilling techniques, and is costly. Solid mineral drilling differs significantly from oil and gas drilling, making it unsuitable for implementing gas logging. Summary of the Invention

[0007] The purpose of this invention is to realize a geochemical logging method and system for metal mineral exploration, which can be used to study the distribution pattern of hydrogen in deep underground, so as to indicate the favorable location for deep metal mineral exploration.

[0008] The technical solution adopted in this invention is: A geochemical logging method for mineral exploration is provided, comprising the following steps: Drilling is carried out in a selected area, and the hydrogen concentration at the wellhead and the drilling depth are continuously and in real time recorded during drilling. Based on the correspondence between the hydrogen concentration at the wellhead and the drilling depth, a first-class geochemical logging gas distribution map is formed. After drilling is paused or completed, the hydrogen concentration at different depths in the borehole is measured. Based on the correspondence between the hydrogen concentration in the borehole and the depth, a second type of geochemical logging gas distribution map is formed. Analyze the gas distribution maps of the first and second types of geochemical logging of multiple boreholes. If at least one record has a hydrogen concentration greater than the threshold, the borehole is considered an anomalous borehole. By analyzing the two types of distribution maps of abnormal boreholes, the depth of hydrogen source is determined based on the abrupt change points of hydrogen concentration, and favorable locations for mineral exploration are identified accordingly.

[0009] Following the above technical solution, a gas transmitter is placed close to the borehole opening on the ground. The gas transmitter continuously records the hydrogen concentration at the borehole opening in real time while drilling is underway.

[0010] Following the above technical solution, when measuring hydrogen concentration inside the borehole, a miniature gas transmitter with a depth encoder that can simultaneously record the burial depth and hydrogen concentration is sent into the borehole via a cable to directly measure the target gas concentration inside the borehole.

[0011] According to the above technical solution, when measuring the hydrogen concentration inside the borehole, a gas transmitter capable of actively pumping gas is placed on the ground surface. The pipe connected to the gas transmitter's inlet is extended into different depths of the borehole to pump the gas inside the borehole to the ground surface to measure the hydrogen concentration.

[0012] Following the above technical solution, when analyzing the two types of distribution maps of abnormal boreholes, if the hydrogen source depths determined by the two maps are inconsistent, the hydrogen source depth determined by the second type of geochemical logging gas distribution map shall prevail.

[0013] Following the above technical solution, when two types of distribution maps are formed, they are specifically in a rectangular coordinate system, with the X-axis representing hydrogen concentration and the Y-axis representing borehole depth, showing the correspondence between hydrogen concentration and borehole depth.

[0014] Following the above technical solution, the resulting distribution maps are either line graphs or histograms.

[0015] The present invention also provides a geochemical logging system for mineral exploration, comprising: The hydrogen concentration measuring device is used to continuously record the hydrogen concentration at the borehole opening in real time during drilling in a selected area; and to measure the hydrogen concentration at different depths inside the borehole after drilling is paused or completed. The analyzer includes a data acquisition module, a plotting module, and an analysis module; The data acquisition module is used to acquire the hydrogen concentration recorded by the hydrogen concentration measuring device and to acquire the depth corresponding to the hydrogen concentration. The drawing module is used to generate a first-type geochemical logging gas distribution map based on the correspondence between hydrogen concentration at the wellhead and drilling depth; and to generate a second-type geochemical logging gas distribution map based on the correspondence between hydrogen concentration inside the well and depth. The analysis module is used to analyze two types of distribution maps of abnormal boreholes and determine the depth of hydrogen source based on the abrupt change points of hydrogen concentration, thereby identifying favorable locations for mineral exploration.

[0016] Following the above technical solution, the hydrogen concentration measuring device is a gas transmitter. When measuring the hydrogen concentration at the borehole opening, it is placed close to the ground borehole opening and continuously records the hydrogen concentration at the borehole opening in real time while drilling is underway.

[0017] Following the above technical solution, the hydrogen concentration measuring device is a miniature gas transmitter with a depth encoder. When measuring the hydrogen concentration in the borehole, it is fed into the borehole through a cable to directly measure the target gas concentration in the borehole and record the depth at the same time.

[0018] The beneficial effects of this invention are as follows: This invention provides a new implementation scheme for gas geochemical exploration of metal mineral resources. This scheme overcomes the limitation of traditional hydrogen-based metal mineral exploration methods that can only collect surface information, enabling the collection of underground hydrogen concentration and spatial distribution data. Based on this data, favorable mineral exploration locations can be inferred, without being limited by depth, and the accuracy of mineral exploration is improved, providing a new method and approach for deep mineral exploration. Furthermore, to prevent the inability to perform measurements inside the borehole due to water accumulation, this invention performs borehole measurements simultaneously with drilling to ensure that usable data for the entire borehole is still available even in the worst-case scenario. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a flowchart of a geochemical logging method for mineral exploration according to an embodiment of the present invention; Figure 2 This is a first-type geochemical logging gas distribution map according to an embodiment of the present invention; Figure 3 This is the second type of geochemical logging gas distribution map according to an embodiment of the present invention; Figure 4 This is a cross-sectional view of all boreholes in the exploration line according to an embodiment of the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0022] It should be noted that the illustrations provided in the embodiments of the present invention are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0023] In this invention, it should also be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used only for descriptive and distinguishing purposes and should not be construed as indicating or implying relative importance.

[0024] Furthermore, it should be noted that the features of the various embodiments of the present invention can be combined or integrated in whole or in part, and as those skilled in the art will understand, they can interact and operate in different ways. Each embodiment can be implemented independently of each other or in association with one another.

[0025] Based on existing metal mineral drilling techniques, this invention provides a convenient and efficient geochemical logging method for hydrogen that is applicable to metal mineral exploration and research, and overcomes the limitations in accuracy and depth.

[0026] like Figure 1 As shown in the figure, the geochemical logging method for mineral exploration according to an embodiment of the present invention is characterized by comprising the following steps: S1. Drilling is carried out in the selected area. During drilling, the hydrogen concentration at the wellhead and the drilling depth are continuously and in real time recorded. Based on the correspondence between the hydrogen concentration at the wellhead and the drilling depth, a first-class geochemical logging gas distribution map is formed. S2. After drilling is paused or completed, measure the hydrogen concentration at different depths in the borehole. Based on the correspondence between the hydrogen concentration in the borehole and the depth, form a second type of geochemical logging gas distribution map. S3. Analyze the gas distribution maps of the first type of geochemical logging and the gas distribution maps of the second type of geochemical logging in multiple boreholes. If there is at least one record with a hydrogen concentration greater than the threshold, then the borehole is regarded as an abnormal borehole. S4. Analyze the two types of distribution maps of abnormal boreholes, determine the hydrogen source depth based on the abrupt change points of hydrogen concentration, and determine favorable mineral exploration locations accordingly.

[0027] In step S1, a gas transmitter can be placed close to the borehole opening on the ground. The gas transmitter continuously records the hydrogen concentration at the borehole opening in real time while drilling is underway.

[0028] In step S2, when measuring the hydrogen concentration inside the borehole, a miniature gas transmitter with a depth encoder that can simultaneously record the burial depth and hydrogen concentration is sent into the borehole via a cable to directly measure the target gas concentration inside the borehole.

[0029] In another embodiment of the present invention, when measuring the hydrogen concentration inside the borehole, a gas transmitter capable of actively pumping gas can be placed on the ground surface. The pipe connected to the gas transmitter's inlet is extended into different depths of the borehole to pump the gas inside the borehole to the ground surface to measure the hydrogen concentration.

[0030] In principle, measuring hydrogen concentration inside the borehole is quite accurate. However, during drilling, water is continuously injected into the borehole. When the rock has poor permeability, the water level inside the borehole can be very high, making it impossible to send the gas pipe or equipment below the water level for in-hole measurement. In such cases, the gas source depth can only be determined indirectly through borehole opening measurements. Therefore, to prevent in-hole measurements from being impossible due to water accumulation, borehole opening measurements are performed simultaneously with drilling to ensure that usable data for the entire borehole is still available even in the worst-case scenario.

[0031] In a typical gold mine exploration project, exploration lines are pre-designed, and several borehole locations are determined at certain intervals along each line. After completing the borehole opening and interior measurements, two types of hydrogen concentration distribution maps are plotted based on the measurement data. These maps can be created in a rectangular coordinate system, with the X-axis representing hydrogen concentration and the Y-axis representing borehole depth, showing the correspondence between hydrogen concentration and borehole depth. The first type of geochemical logging gas distribution map is formed based on the correspondence between the borehole opening hydrogen concentration and the drilling depth; the second type of geochemical logging distribution map is formed by mapping the borehole interior hydrogen concentration to depth. Different distribution map formats can be selected as needed, such as line graphs or histograms. When screening for abnormal boreholes, the criterion is that if at least one record in either the first or second type of distribution map of a borehole has a maximum hydrogen concentration higher than a preset value (e.g., 50 ppmv), it is considered a hydrogen-abnormal borehole. That is, if all hydrogen concentration values ​​in a borehole are below 50 ppmv, the corresponding type of distribution map for that borehole is discarded. If at least one location in a borehole has a value greater than 50 ppmv, then retain the corresponding distribution map for that borehole.

[0032] In step S4, when analyzing the two types of distribution maps for abnormal boreholes, if the hydrogen source depths determined by the two maps are inconsistent, the hydrogen source depth determined by the second type of geochemical logging gas distribution map shall prevail. Because the methods used in the two measurement stages are different, the methods for determining the hydrogen source depth also differ between the two types of distribution maps. During borehole head measurements, as drilling reaches the deep gas source location, hydrogen is typically released continuously, causing the hydrogen concentration reading at the headhole to increase from low to high. Therefore, in the first type of distribution map, the depth where the concentration increases from low to high may be the hydrogen source depth. However, during borehole measurements, because hydrogen has a lower density than other gases, it diffuses upwards from the gas source. Therefore, in the second type of distribution map, the depth where the concentration decreases from high to low may be the hydrogen source depth. When the depth obtained from the second type of distribution map differs from that of the first type of distribution map, the depth from the second type of distribution map shall be prioritized.

[0033] In another embodiment of the present invention, the implementation of the geochemical logging method is divided into three steps: design, measurement, and data analysis.

[0034] (1) Design The prerequisite for conducting geochemical logging of hydrogen is the existence of a pre-designed but not yet implemented drilling project. This drilling project can be specifically designed for geochemical logging, or it can be designed for other purposes such as target area verification and ore body control. When drilling is specifically designed for geochemical logging, it can be designed in accordance with relevant standards for geological core drilling.

[0035] (2) Measurement Hydrogen concentration measurement is divided into two stages: orifice measurement and orifice measurement.

[0036] Orifice measurement method: 1) During drilling, a gas transmitter is placed close to the borehole opening on the ground. The gas transmitter should be able to continuously record the hydrogen concentration at the borehole opening in real time during drilling (this gas transmitter is existing technology).

[0037] 2) During the drilling process, the drilling depth and the hydrogen concentration at that time are recorded manually or automatically.

[0038] 3) Correspond hydrogen concentration to depth to form a first-type geochemical logging line graph (referred to as "first-type line graph").

[0039] In-hole measurement method: 1) When drilling is paused or completed (i.e., with the drill pipe removed), use a gas transmitter to measure the hydrogen concentration in the borehole. There are two specific measurement methods: a. A miniature gas transmitter with a depth encoder, capable of simultaneously recording the descent depth and hydrogen concentration, is sent into the borehole via a cable to directly measure the target gas concentration inside the hole.

[0040] b. Place a gas transmitter capable of actively pumping gas on the surface, and extend the pipe connected to the gas transmitter's inlet into different depths of the borehole to pump the gas from the borehole to the surface to measure the hydrogen concentration.

[0041] 2) Correspond hydrogen concentration to depth to form a second type of geochemical logging line graph (referred to as "second type line graph").

[0042] Both types of line graphs are set in a rectangular coordinate system, with the X-axis representing hydrogen concentration and the Y-axis representing borehole depth, to show the correspondence between hydrogen concentration and borehole depth.

[0043] (3) Data Analysis Data analysis consists of three steps: The first step is to screen out abnormal boreholes.

[0044] If at least one record in either the Type I or Type II line graph of a borehole shows a maximum hydrogen concentration higher than 50 ppmv, then the borehole is considered to have an abnormal hydrogen concentration.

[0045] The second step is to determine the depth of the hydrogen source.

[0046] Because the methods used in the two measurement stages differ, the methods for determining the hydrogen source depth using the two types of line graphs also differ. During borehole head measurements, as drilling reaches the deep gas source location, hydrogen is typically released continuously, causing the hydrogen concentration reading at the headhole to increase. Therefore, in the first type of line graph, the depth where the concentration increases from low to high likely represents the hydrogen source depth. However, during borehole head measurements, because hydrogen has a lower density than other gases, it diffuses upwards from the gas source. Therefore, in the second type of line graph, the depth where the concentration decreases from high to low likely represents the hydrogen source depth. When the depth obtained from the second type of line graph differs from that of the first type, the depth obtained from the second type of line graph takes precedence.

[0047] The third step involves inferring the source of hydrogen by analyzing the depth of hydrogen sources in multiple boreholes, thereby identifying favorable locations for mineral exploration.

[0048] The hydrogen source in the borehole is essentially a sampling of the hydrogen's migration path from deep to shallow depths, not its actual source. According to basic physics, hydrogen, being one of the lightest substances, always diffuses from near to far and from deep to shallow depths within the atmosphere. The further away from the hydrogen source, the lower the hydrogen concentration becomes due to rock porosity and atmospheric dilution. Based on this principle, the true source of the hydrogen can be inferred from these sampling points. Furthermore, since hydrogen is often associated with ore bodies, the location of the hydrogen source is also a favorable location for mineral exploration.

[0049] In the third embodiment of this invention, taking a detailed exploration project of a gold mine as an example, five boreholes were designed along exploration line 101, with a spacing of approximately 100 meters. A single data exploration gas transmitter, model G1, was used. This transmitter was equipped with an electrochemical hydrogen sensor with a range of 1-1000 ppmv and an error of 1 ppmv; a vacuum pump with a flow rate of 2.5 L / min and a vacuum suction of 50 kPa; and an electronic barometer with a range of 30-110 kPa and an error of 0.01 kPa. After the boreholes were drilled, the transmitter was placed within 1 meter of the borehole opening to continuously monitor the hydrogen concentration near the opening. After drilling was completed and the drill rod was removed, once the water level had dropped, the transmitter was connected to a silicone tube and inserted into the borehole to extract gas samples at different depths at 5-meter intervals. Based on the measurement data from these two stages, two types of line graphs were plotted. Taking borehole ZK10101 as an example, its type I line graph is shown below. Figure 2 As shown, the second type of line chart is as follows: Figure 3 As shown.

[0050] As can be seen from the graphs, the depths indicated by the two types of line graphs are basically the same, with the hydrogen source in borehole ZK10101 located at a depth of approximately 35 meters. Since the hydrogen concentration in this borehole reaches a maximum of 310 ppmv, it is considered an abnormal borehole.

[0051] The above method was used to measure and process the data from all five boreholes along the exploration line, and profile diagrams were drawn, such as... Figure 4 As shown.

[0052] Observation of the cross-sectional diagrams reveals that ZK10102 and ZK10103 on the west side show no hydrogen anomalies. However, from ZK10101 westward to ZK10105, the depth of the hydrogen source in the boreholes increases, and the hydrogen concentration also increases. Following the principle that "hydrogen in the atmosphere always diffuses from near to far from its source and from deep to shallow," the true hydrogen source should be located deeper on the west side. Therefore, the west side is a favorable location for mineral exploration, and the next step should be to design deeper boreholes on the west side.

[0053] This invention also provides a geochemical logging system for mineral exploration, mainly used to implement the above-described method embodiments. The system includes: The hydrogen concentration measuring device is used to continuously record the hydrogen concentration at the borehole opening in real time during drilling in a selected area; and to measure the hydrogen concentration at different depths inside the borehole after drilling is paused or completed. The analyzer includes a data acquisition module, a plotting module, and an analysis module; The data acquisition module is used to acquire the hydrogen concentration recorded by the hydrogen concentration measuring device and to acquire the depth corresponding to the hydrogen concentration. The drawing module is used to generate a first-type geochemical logging gas distribution map based on the correspondence between hydrogen concentration at the wellhead and drilling depth; and to generate a second-type geochemical logging gas distribution map based on the correspondence between hydrogen concentration inside the well and depth. The analysis module is used to analyze two types of distribution maps of abnormal boreholes and determine the depth of hydrogen source based on the abrupt change points of hydrogen concentration, thereby identifying favorable locations for mineral exploration.

[0054] Among them, the hydrogen concentration measuring equipment can be a gas transmitter. When measuring the hydrogen concentration at the borehole opening, it is placed close to the ground borehole opening and the hydrogen concentration at the borehole opening is continuously and in real time recorded during drilling.

[0055] Alternatively, a miniature gas transmitter with a depth encoder can be selected as the hydrogen concentration measuring device. When measuring the hydrogen concentration in the borehole, the transmitter is fed into the borehole through a cable to directly measure the target gas concentration in the borehole and record the depth at the same time.

[0056] The various modules of the analyzer are mainly used to implement the various steps of the above method embodiments, which will not be described in detail here.

[0057] In summary, this invention provides a new method for gas geochemical exploration of metal mineral resources. It overcomes the shortcomings of traditional hydrogen-based metal mineral exploration methods that can only collect surface information, and enables the collection of underground hydrogen concentration and spatial distribution data. Based on this data, it can infer favorable mineral exploration locations, providing a new method and new ideas for deep mineral exploration.

[0058] It should be noted that, depending on the implementation needs, the various steps / components described in this application can be broken down into more steps / components, or two or more steps / components or parts of the operation of steps / components can be combined into new steps / components to achieve the purpose of this invention.

[0059] The order of the steps in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0060] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A geochemical logging method for mineral exploration, characterized in that, Includes the following steps: Drilling is carried out in a selected area, and the hydrogen concentration at the wellhead and the drilling depth are continuously and in real time recorded during drilling. Based on the correspondence between the hydrogen concentration at the wellhead and the drilling depth, a first-class geochemical logging gas distribution map is formed. After drilling is paused or completed, the hydrogen concentration at different depths in the borehole is measured. Based on the correspondence between the hydrogen concentration in the borehole and the depth, a second type of geochemical logging gas distribution map is formed. Analyze the gas distribution maps of the first and second types of geochemical logging of multiple boreholes. If at least one record has a hydrogen concentration greater than the threshold, the borehole is considered an anomalous borehole. By analyzing the two types of distribution maps of abnormal boreholes, the depth of hydrogen source is determined based on the abrupt change points of hydrogen concentration, and favorable locations for mineral exploration are identified accordingly.

2. The geochemical logging method for mineral exploration according to claim 1, characterized in that, A gas transmitter is placed close to the borehole opening on the ground. The gas transmitter continuously records the hydrogen concentration at the borehole opening in real time while drilling is underway.

3. The geochemical logging method for mineral exploration according to claim 1, characterized in that, When measuring hydrogen concentration inside the borehole, a miniature gas transmitter with a depth encoder, capable of simultaneously recording the depth and hydrogen concentration, is sent into the borehole via a cable to directly measure the target gas concentration inside the borehole.

4. The geochemical logging method for mineral exploration according to claim 1, characterized in that, When measuring hydrogen concentration inside the borehole, a gas transmitter capable of actively pumping gas is placed on the ground. The pipe connected to the gas transmitter's inlet is extended into different depths of the borehole to pump the gas from the borehole to the ground surface for measuring the hydrogen concentration.

5. The geochemical logging method for mineral exploration according to claim 1, characterized in that, When analyzing the two types of distribution maps of abnormal boreholes, if the hydrogen source depths determined by the two maps are inconsistent, the hydrogen source depth determined by the second type of geochemical logging gas distribution map shall prevail.

6. The geochemical logging method for mineral exploration according to claim 1, characterized in that, When the two types of distribution maps are generated, they are specifically in a rectangular coordinate system, with the X-axis representing hydrogen concentration and the Y-axis representing borehole depth, showing the correspondence between hydrogen concentration and borehole depth.

7. The geochemical logging method for mineral exploration according to claim 1, characterized in that, The resulting distribution maps are either line graphs or histograms.

8. A geochemical logging system for mineral exploration, characterized in that, include: Hydrogen concentration measuring equipment is used to continuously record the hydrogen concentration at the borehole opening in real time during drilling in a selected area. And it is used to measure the hydrogen concentration at different depths in the borehole when drilling is paused or completed; The analyzer includes a data acquisition module, a plotting module, and an analysis module; The data acquisition module is used to acquire the hydrogen concentration recorded by the hydrogen concentration measuring device and to acquire the depth corresponding to the hydrogen concentration. The drawing module is used to generate a first-type geochemical logging gas distribution map based on the correspondence between hydrogen concentration at the wellhead and drilling depth; and to generate a second-type geochemical logging gas distribution map based on the correspondence between hydrogen concentration inside the well and depth. The analysis module is used to analyze two types of distribution maps of abnormal boreholes and determine the depth of hydrogen source based on the abrupt change points of hydrogen concentration, thereby identifying favorable locations for mineral exploration.

9. The geochemical logging system for mineral exploration according to claim 8, characterized in that, The hydrogen concentration measuring device is a gas transmitter. When measuring the hydrogen concentration at the borehole opening, it is placed close to the ground borehole opening and continuously records the hydrogen concentration at the borehole opening in real time while drilling is underway.

10. The geochemical logging system for mineral exploration according to claim 8, characterized in that, The hydrogen concentration measuring device is a miniature gas transmitter with a depth encoder. When measuring the hydrogen concentration in the borehole, it is fed into the borehole through a cable to directly measure the target gas concentration in the borehole and record the drilling depth at the same time.

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