Construction method for cooperative transient electromagnetic detection of regional exploration treatment hole

Abstract

The invention discloses a construction method for cooperative transient electromagnetic detection of a regional exploration treatment hole, and the method comprises the steps: drilling an exploration treatment hole which extends to limestone of a coal seam floor on the ground, and the exploration treatment hole comprises a straight hole section, a directional deflecting section and a directional branch bedding section; geological data of a directional branch bedding section are collected; a detection drilling tool extends into a detection position of the directional branch bedding section from the detection treatment hole, a transient electromagnetic detection tube is arranged at the front end of the detection drilling tool, and the transient electromagnetic detection tube comprises a transmitting device and a receiving device; a primary field is transmitted by a transmitting device, induced electromotive force of a secondary field is received by a receiving device, and the secondary field is an eddy current field generated in the propagation process of the primary field in a directional branch bedding section; and exploring the to-be-detected area in combination with geological data and the induced electromotive force of the secondary field. According to the method, accurate exploration of the limestone aquifer of the coal seam floor is realized through cooperative application of the regional exploration treatment hole and the transient electromagnetic detection, and the accuracy and reliability of the detection are effectively improved.

Description

Technical Field

[0001] This invention relates to the field of geological drilling technology, specifically to a construction method for coordinated transient electromagnetic detection in regional exploration and treatment boreholes. Background Technology

[0002] To address the limestone water hazard at the bottom of coal seams, release deep coal resources, and ensure safe mining, various mining groups in China have successively carried out advanced surface exploration and remediation work. This work aims to transform passive emergency remediation underground into proactive and precise surface remediation, providing a prerequisite for safe mining of the working face.

[0003] Currently, the conventional technical approach involves constructing a surface directional well and drilling multiple bedding-parallel branch boreholes to extend along the bedding plane within the target limestone layer. This is followed by high-pressure water pressure testing to assess formation permeability, and then high-pressure grouting to seal any identified anomalous sections. This method, by exploring and sealing vertically concealed water-bearing channels in the limestone floor of the coal seam, reduces the water-bearing capacity of the limestone, thereby constructing a reliable control barrier.

[0004] However, the above-mentioned methods have significant limitations: First, insufficient exploration accuracy. Relying solely on water pressure tests and drill cuttings analysis, the response is limited to the borehole itself. For the surrounding strata, especially vertically developed concealed water-conducting structures, the response is extremely weak, making them prone to being missed. Second, limited exploration range. The above methods can only reflect the geological conditions along the drill bit's trajectory, failing to acquire geological information in the three-dimensional space surrounding the borehole radially, resulting in a large blind spot. Third, poor guidance. The above methods cannot accurately locate the spatial orientation of water-bearing structures around the borehole, leading to blind grouting treatment. Often, "range-based" grouting is performed based on experience, resulting in grout waste and difficulty in verifying the treatment effect. In conclusion, the above methods cannot accurately explore the structure of the strata surrounding the borehole and the water-bearing nature of the limestone. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a construction method for coordinated transient electromagnetic detection of regional exploration and treatment boreholes, aiming to accurately explore the limestone aquifer at the bottom of coal seams and effectively improve the accuracy and reliability of the detection.

[0006] This invention discloses a construction method for coordinated transient electromagnetic detection of regional exploration and treatment boreholes, comprising:

[0007] Exploration and treatment boreholes are drilled on the ground to extend into the limestone floor of the coal seam. The exploration and treatment boreholes include a straight section, a directional drilling section, and a directional branch bedding section set from top to bottom.

[0008] Collect geological data of the directional branching bedding section;

[0009] The detection drill bit is inserted from the exploratory treatment hole to the detection position of the directional branch in the bedding section. The front end of the detection drill bit is equipped with a transient electromagnetic probe, which includes a transmitting device and a receiving device.

[0010] The primary field is emitted using a transmitting device, and the induced electromotive force of the secondary field is received using a receiving device. The primary field is a transient electromagnetic field, and the secondary field is the eddy current field generated by the primary field during the propagation of the primary field along the directional branch in the layered section.

[0011] The area to be investigated is explored by combining geological data and the induced electromotive force of the secondary field.

[0012] Preferably, drilling exploratory treatment holes extending from the ground into the limestone floor of the coal seam includes:

[0013] The first drill bit is used to drill to the first preset position and the first casing is installed to obtain a straight hole section. The first preset position is stable bedrock.

[0014] The second drilling tool is used to drill to the second preset position and the second casing is installed to obtain the directional drilling section. The second preset position is the target limestone aquifer. The bottom inclination angle of the directional drilling section is within the preset angle range, which is 85 degrees to 95 degrees.

[0015] The third drilling tool is used to drill along the first direction of the target limestone aquifer to the detection position in order to obtain the directional branching bedding section.

[0016] Preferably, the first drilling tool includes a first drill bit;

[0017] After drilling to the first preset position using the first drill bit and installing the first casing to obtain a straight hole section, the process further includes:

[0018] Cement grout was injected into the annular space between the first casing and the well wall;

[0019] Let it stand for the first preset time until the cement slurry solidifies and hardens.

[0020] Preferably, the second drilling tool includes a second drill bit, a screw elbow, and a wireless drilling rig.

[0021] The diameter of the second drill bit is smaller than the diameter of the first casing;

[0022] The screw elbow is used to control the drilling direction;

[0023] Wireless measurement-while-drilling (MWD) systems are used to measure and transmit well signals, including well depth, inclination angle, and azimuth.

[0024] Preferably, the second drilling tool is used to drill to a second preset position, and a second casing is installed to obtain a directional drilling section, including:

[0025] The screw bend is used to push the second drill bit to drill along the second direction to the second preset position;

[0026] Exploration well signals are measured and transmitted in real time using a wireless drilling surveying system;

[0027] Remove the second drill string and run the second casing into the directional drilling section. The diameter of the second casing is smaller than that of the second drill string.

[0028] Inject cement grout between the second casing and the wellbore;

[0029] Let it stand for the second preset time until the cement slurry solidifies and hardens.

[0030] Preferably, the third drilling tool includes a third drill bit, a screw elbow, and a wireless measurement-while-drilling system; the diameter of the third drill bit is smaller than the diameter of the second casing.

[0031] Preferably, the construction method for coordinated transient electromagnetic detection of regional exploration and treatment boreholes further includes:

[0032] During the drilling of the directional branch bedding section, a variety of logging techniques are used to collect geological data of the directional branch bedding section. These logging techniques include cuttings logging, gamma logging, hydrological observation, drilling fluid logging, and drilling time logging.

[0033] Drilling fluid parameters and rock property parameters are obtained based on geological data. Drilling fluid parameters include fluid volume change, fluid density, fluid viscosity and salt content, while rock property parameters include rock type and rock strength.

[0034] Obtain borehole plan profiles, which are used to characterize the extension trajectory of the exploration and treatment boreholes in the limestone floor of the coal seam;

[0035] Based on the borehole profile and rock performance parameters, determine the geological structures encountered during drilling;

[0036] The water-bearing capacity of limestone was determined by combining borehole profile diagrams and drilling fluid parameters.

[0037] Preferably, launching a field using a launching device includes:

[0038] The transient electromagnetic probe emits a pulse current, which is used to control the transmitting device to generate or cancel the transient electromagnetic field.

[0039] Preferably, after receiving the induced electromotive force of the secondary field using the receiving device, the method further includes:

[0040] The induced electromotive force of the secondary field is processed to obtain the decay signal;

[0041] The decay signal is inverted and converted into a spatial image, which is used to characterize the geological structure features of the area under test. These features include aquifer distribution, aquifer thickness, and rock conductivity.

[0042] Based on spatial image analysis, the geological structure and water-bearing properties of limestone within a preset distance range of 25 to 35 meters were investigated for the treatment borehole.

[0043] Preferably, after exploring the area to be measured by combining geological data and the induced electromotive force of the secondary field, the method further includes:

[0044] Grouting treatment was carried out on the area to be tested, and the exploration treatment hole was re-drilled to the second detection position, which is the same as the detection position of the directional branch bedding section;

[0045] The probe is extended to the second detection position, and a field is launched toward the second detection position;

[0046] The induced electromotive force of the receiving detection field is the eddy current field generated by the primary field at the second detection position;

[0047] By comparing the induced electromotive force of the detection field and the induced electromotive force of the secondary field, the grouting treatment effect can be quantitatively evaluated.

[0048] Compared with existing technologies, the beneficial effects of this invention are as follows: By combining regional exploration and treatment boreholes with transient electromagnetic detection technology, a more accurate and comprehensive exploration of the limestone aquifer at the bottom of the coal seam is achieved. This method not only improves the accuracy and reliability of the exploration but also effectively expands the exploration range and reduces the risk of missed detection of geological structures and water-bearing properties of the limestone. Furthermore, using transient electromagnetic probes for detection allows for real-time reception and analysis of the induced electromotive force of the secondary field, further improving detection efficiency and quality. The construction method of this invention also has good guidance capabilities, enabling precise positioning of the spatial orientation of water-bearing structures around the borehole, providing a more accurate basis for subsequent grouting treatment, reducing grout waste, and improving the verifiability of the treatment effect. Attached Figure Description

[0049] Figure 1 A flowchart of the construction method for regional exploration and treatment borehole-assisted transient electromagnetic detection provided by the present invention;

[0050] Figure 2 Plan layout diagram of exploration and treatment boreholes for the advanced area of ​​coal seam floor limestone water surface provided by the present invention;

[0051] Figure 3 This is a cross-sectional view of the transient electromagnetic detection inside the hole provided by the present invention. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] The present invention will now be described in further detail with reference to the accompanying drawings.

[0054] This invention provides a construction method for coordinated transient electromagnetic detection of regional exploration and treatment boreholes, such as... Figure 1 As shown, the construction method includes drilling exploratory treatment holes on the ground extending into the limestone floor of the coal seam, such as... Figure 2 As shown, the exploration and treatment borehole includes a straight borehole section, a directional drilling section, and directional branch bedding sections arranged sequentially from top to bottom.

[0055] Specifically, the drilling process for exploration and treatment boreholes can be divided into three stages. First, the first drilling tool is used to drill to the first preset position and a first casing is installed to obtain a straight borehole section. The first preset position is stable bedrock. Next, the second drilling tool is used to drill to the second preset position and a second casing is installed to obtain a directional drilling section. The second preset position is the target limestone aquifer. Finally, the third drilling tool is used to drill along the first direction of the target limestone aquifer to the exploration position to obtain a directional branching bedding section.

[0056] In this embodiment of the invention, a directional borehole is drilled from the ground to explore and manage groundwater in the limestone layer below the coal seam floor. First, using a first drilling tool, drilling begins from the ground surface, penetrating the surface soil and loose gravel layer (i.e., weathered layer) to reach a first predetermined location. The first predetermined location is stable bedrock, i.e., a hard, intact rock layer. The first drilling tool includes a first drill bit with a diameter of 345 mm. Next, a first casing is driven into the borehole to seal the fragile strata and establish a robust passage. The outer diameter of the first casing is 273.1 mm, and the wall thickness is 8.89 mm. The first casing can be a high-strength oilfield-specific casing.

[0057] Furthermore, cement grout is injected into the annular space between the first casing and the well wall. The height of the cement grout is greater than or equal to the height of the straight borehole section, and the grout is allowed to stand for a first preset time until it solidifies and hardens. The first preset time can be 72 hours. The cement grout needs to fill the entire ambient space to ensure stability between the first preset position and the ground opening.

[0058] In this embodiment of the invention, the bottom inclination angle of the directional drilling section is within a preset angle range, which is 85 degrees to 95 degrees. The second drilling tool includes a second drill bit, a screw elbow, and a wireless measurement-while-drilling (MWD) system. The diameter of the second drill bit is smaller than the diameter of the first casing. The screw elbow is used to control the drilling direction, and the wireless MWD system is used to measure and transmit well exploration signals, which include well depth, inclination angle, and azimuth.

[0059] During the drilling of the directional drilling section, the second drill bit is first driven along the second direction to the second preset position using a screw elbow. Then, a wireless logging-while-drilling system is used to measure and transmit well exploration signals in real time. Next, the second drill string is removed, and a second casing is run into the directional drilling section. The diameter of the second casing is smaller than that of the second drill string. Finally, cement slurry is injected between the second casing and the wellbore, with the slurry height being greater than or equal to the height of the directional drilling section. The slurry is then left to stand for a second preset time until it solidifies and hardens.

[0060] For example, the second drill bit has a diameter of 245 mm, the second casing has an outer diameter of 193.7 mm, and a wall thickness of 8.33 mm.

[0061] It should be noted that the screw elbow is a downhole motor with a certain angle of curvature in its casing. When the drill string is not rotating but only pressure is applied, the screw elbow will push the drill bit to drill in a fixed direction, thereby achieving directional drilling and turning. After the second drill string drills to the second preset position (i.e., the target limestone aquifer), the drill string is pulled out, and a smaller diameter casing (the second casing) is run into this curved wellbore. Cement slurry is then used to cement the well, thereby sealing the entire curved section and the target limestone aquifer.

[0062] In this embodiment of the invention, the third drilling tool includes a third drill bit, a screw elbow, and a wireless measurement-while-drilling system. The diameter of the third drill bit is smaller than the diameter of the second casing. For example, the diameter of the third drill bit is 152.4 mm.

[0063] Specifically, after successfully creating an axial slope and sealing it with casing, a smaller third drilling tool is used to conduct long-distance, precise drilling along the first direction inside the target limestone aquifer, thereby maximizing the exploration or treatment of the target area. The first direction is similar to the horizontal direction.

[0064] It should be noted that the limestone aquifer at the bottom of a coal seam is usually horizontal or gently sloping. Only by drilling through the limestone aquifer in a near-horizontal direction can the aquifer be contacted for the longest time and over the largest area, thereby achieving the best exploration and treatment results.

[0065] In this embodiment of the invention, the acquisition of geological data for the directional branching bedding section includes: during the drilling of the directional branching bedding section, various logging techniques are used to acquire geological data for the directional branching bedding section, including cuttings logging, gamma logging, hydrological observation, drilling fluid logging, and drilling time logging. Next, drilling fluid parameters and rock property parameters are obtained based on the geological data. The drilling fluid parameters include fluid level volume change, fluid density, fluid viscosity, and salinity; the rock property parameters include rock type and rock strength. Next, a borehole profile is obtained, which is used to characterize the extension trajectory of the exploratory treatment borehole in the limestone floor of the coal seam. Finally, by combining the borehole profile and rock property parameters, the encountered structural conditions are determined, and by combining the borehole profile and drilling fluid parameters, the water-bearing capacity of the limestone is determined.

[0066] Specifically, cuttings logging determines the type of rock encountered by periodically collecting rock fragments brought up from the bottom of the well by the drilling fluid. Gamma-ray logging uses a gamma-ray detector to continuously measure the natural radioactivity of the formation around the wellbore. Since different lithologies have different radioactivity, the characteristic changes in the gamma-ray curve can be used to determine whether the drill bit has entered a mudstone layer from a limestone layer, thus identifying the stratigraphic position and determining whether the well trajectory is "bedding-parallel." Hydrological observation determines the development of formation fractures and water-bearing capacity by continuously monitoring changes in the volume of the drilling fluid pool. Drilling fluid logging determines whether the formation contains water by monitoring the performance parameters of the drilling fluid (such as density, viscosity, and salinity). Drilling time logging reflects the hardness of the rock by recording the time required to drill one meter, thus identifying fractures and caverns.

[0067] Based on the above geological data, combined with the borehole profile, the geological structure encountered and the water-bearing properties of the limestone can be analyzed. For example, a sudden drop in drilling time, drilling fluid loss, rock cuttings breakage, or abrupt changes in gamma values ​​indicate that a fault or large fracture zone has been encountered.

[0068] In embodiments of the present invention, such as Figure 3 As shown, a probe drill bit is extended from the exploratory treatment hole to the detection location of the directional branch bedding section. The probe drill bit's front end is equipped with a transient electromagnetic probe, which includes a transmitter and a receiver. The transmitter emits a primary field, and the receiver receives the induced electromotive force of the secondary field. Finally, the area to be tested is explored by combining geological data and the induced electromotive force of the secondary field.

[0069] Specifically, the transient electromagnetic probe emits pulsed currents, which are used to control the transmitting device to generate or deactivate the transient electromagnetic field. The pulsed current controls the transmitting device to generate a strong transient electromagnetic field, the primary field. When this field propagates and encounters different media, it generates eddy current fields. For example, when it encounters water-bearing fissures or caves, it causes strong vibrations in water molecules; however, when it encounters intact, dry rock, it produces almost no vibrations. When the transient electromagnetic field is deactivated, these eddy current fields release energy to form a secondary field. The receiving device measures the induced electromotive force of the received secondary field.

[0070] Furthermore, after receiving the induced electromotive force of the secondary field using the receiving device, the process also includes data processing of the induced electromotive force of the secondary field to obtain a decay signal, and converting the decay signal into a spatial image. The spatial image is used to characterize the geological structure features of the area to be measured, including aquifer distribution, aquifer thickness, and rock conductivity. Based on the spatial image analysis, the geological structure and water-bearing properties of the limestone within a preset distance range of the treatment borehole are investigated. The preset distance range is 25 meters to 35 meters.

[0071] Specifically, the received secondary field-induced electromotive force is preprocessed through filtering and amplification to extract useful decay signals. These decay signals carry information about the resistivity distribution of the subsurface medium, forming the basis for subsequent inversion and conversion. The inversion algorithm then converts the decay signals into intuitive three-dimensional spatial images. In these images, different colors or grayscale values ​​represent different signal values, clearly displaying the distribution characteristics of the subsurface medium. Based on these spatial images, geological engineers can accurately analyze the geological structures within the pre-defined area of ​​the exploration and treatment borehole, such as the distribution of rock strata and the orientation of fault zones.

[0072] In this embodiment of the invention, the geological data obtained from process logging and the induced electromotive force of the secondary field obtained from transient electromagnetic detection are combined to explore the area to be tested, and then a specific plan for subsequent grouting treatment is formulated.

[0073] In this embodiment of the invention, after exploring the area to be tested by combining geological data and the induced electromotive force of the secondary field, grouting is performed on the area to be tested, and the exploration and treatment hole is re-drilled to the second detection position, which is the same as the detection position of the directional branch bedding section. Transient electromagnetic detection is performed again at the second detection position, and the results are compared with the detection results before grouting to verify the grouting effect.

[0074] Specifically, the probe is extended to the second detection position and a primary field is emitted towards the second detection position; the induced electromotive force of the detection field is received, and the detection field is the eddy current field generated by the primary field at the second detection position; the induced electromotive force of the detection field and the induced electromotive force of the secondary field are compared to quantitatively evaluate the grouting treatment effect.

[0075] This allows for a more accurate assessment of the improvement of geological structure caused by grouting. If the induced electromotive force in the detection field shows a significant change compared to the induced electromotive force in the secondary field, it indicates that the grouting material has effectively filled the voids in the underground medium, enhancing the stability and water-tightness of the rock strata. By continuously monitoring the detection results before and after grouting, the grouting plan can be adjusted in a timely manner to ensure that the grouting treatment achieves the expected results. Furthermore, this method provides a quantitative evaluation tool for the effectiveness of grouting treatment, offering a scientific basis for subsequent engineering decisions.

[0076] As can be seen from the above technical solution, this invention provides a construction method for coordinated transient electromagnetic detection using regional exploration and treatment boreholes, comprising: drilling exploration and treatment boreholes extending to the limestone floor of the coal seam on the ground, the exploration and treatment boreholes including a straight section, a directional drilling section, and a directional branch bedding section; collecting geological data of the directional branch bedding section; extending a detection drill bit from the exploration and treatment borehole to the detection position of the directional branch bedding section, the front end of the detection drill bit being equipped with a transient electromagnetic probe, the transient electromagnetic probe including a transmitting device and a receiving device; transmitting a primary field using the transmitting device and receiving the induced electromotive force of the secondary field using the receiving device, the secondary field being the eddy current field generated during the propagation of the primary field in the directional branch bedding section; and exploring the area to be tested based on the geological data and the induced electromotive force of the secondary field.

[0077] This invention combines regional exploration boreholes with transient electromagnetic detection technology to achieve more precise and comprehensive exploration of limestone aquifers in the coal seam floor. This method not only improves the accuracy and reliability of the exploration but also effectively expands the exploration range and reduces the risk of missed detection of geological structures and water-bearing properties of the limestone. Furthermore, using transient electromagnetic probes allows for real-time reception and analysis of the induced electromotive force of the secondary field, further enhancing exploration efficiency and quality. The construction method of this invention also has good guidance capabilities, enabling precise positioning of the spatial orientation of water-bearing structures around the borehole, providing a more accurate basis for subsequent grouting treatment, reducing grout waste, and improving the verifiability of the treatment effect.

[0078] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A construction method for regional exploration and treatment borehole-assisted transient electromagnetic detection, characterized in that, include: Exploration and treatment boreholes are drilled on the ground to extend into the limestone floor of the coal seam. The exploration and treatment boreholes include a straight section, a directional drilling section, and a directional branching section arranged sequentially from top to bottom. Collect geological data of the directional branch bedding section; The detection drill bit is inserted from the detection and treatment hole to the detection position of the directional branch in-seam section. The front end of the detection drill bit is equipped with a transient electromagnetic probe, which includes a transmitting device and a receiving device. The transmitting device emits a primary field, and the receiving device receives the induced electromotive force of the secondary field. The primary field is a transient electromagnetic field, and the secondary field is an eddy current field generated by the primary field during the propagation of the directional branch along the layer segment. The area to be tested is explored by combining the geological data and the induced electromotive force of the secondary field.

2. The construction method for coordinated transient electromagnetic detection of regional exploration and treatment boreholes according to claim 1, characterized in that, The drilling of exploratory treatment holes extending from the ground into the limestone floor of the coal seam includes: The first drill bit is used to drill to a first preset position, and a first casing is installed to obtain the straight hole section. The first preset position is stable bedrock. The second drilling tool is used to drill to the second preset position and a second casing is installed to obtain the directional drilling section. The second preset position is the target limestone aquifer. The bottom inclination angle of the directional drilling section is within a preset angle range, which is 85 degrees to 95 degrees. The third drilling tool is used to drill along the first direction of the target limestone aquifer to the detection position in order to obtain the directional branching bedding section.

3. The construction method for coordinated transient electromagnetic detection of regional exploration and treatment boreholes according to claim 2, characterized in that, The first drilling tool includes a first drill bit; After drilling to the first preset position using the first drill bit and installing the first casing to obtain the straight hole section, the method further includes: Cement grout is injected into the annular space between the first casing and the well wall; Let it stand for a first preset time until the cement slurry solidifies and hardens.

4. The construction method for regional exploration and treatment borehole-assisted transient electromagnetic detection according to claim 3, characterized in that, The second drilling tool includes a second drill bit, a screw elbow, and a wireless drilling rig. The diameter of the second drill bit is smaller than the diameter of the first casing; The screw elbow is used to control the drilling direction; The wireless measurement-while-drilling system is used to measure and transmit well exploration signals, which include well depth, well inclination angle, and azimuth angle.

5. The construction method for coordinated transient electromagnetic detection of regional exploration and treatment boreholes according to claim 4, characterized in that, The step of drilling to a second preset position using a second drilling tool and installing a second casing to obtain the directional drilling section includes: The screw bend is used to push the second drill bit to drill along the second direction to the second preset position; The wireless drilling surveying system is used to measure and transmit the well signals in real time. Remove the second drill bit and run the second casing into the directional drilling section. The diameter of the second casing is smaller than the diameter of the second drill bit. Inject cement grout between the second casing and the wellbore; Allow the cement slurry to stand for a second preset time until it solidifies and hardens.

6. The construction method for coordinated transient electromagnetic detection of regional exploration and treatment boreholes according to claim 5, characterized in that, The third drilling tool includes a third drill bit, the screw elbow, and the wireless drilling homing system; the diameter of the third drill bit is smaller than the diameter of the second casing.

7. The construction method for coordinated transient electromagnetic detection of regional exploration and treatment boreholes according to claim 1, characterized in that, Also includes: During the drilling of the directional branch bedding section, geological data of the directional branch bedding section are collected using a variety of logging techniques, including cuttings logging, gamma logging, hydrological observation, drilling fluid logging, and drilling time logging. Drilling fluid parameters and rock performance parameters are obtained based on the geological data. The drilling fluid parameters include fluid volume change, fluid density, fluid viscosity and salt content. The rock performance parameters include rock type and rock strength. Obtain a borehole plan view, which is used to characterize the extension trajectory of the exploratory treatment borehole in the limestone floor of the coal seam; Based on the borehole profile and the rock performance parameters, determine the geological structure encountered during drilling; Based on the borehole profile and drilling fluid parameters, the water-bearing capacity of the limestone was determined.

8. The construction method for coordinated transient electromagnetic detection of regional exploration and treatment boreholes according to claim 1, characterized in that, The method of launching a field using the launching device includes: The transient electromagnetic probe is controlled to emit a pulse current, which is used to control the transmitting device to generate or cancel the transient electromagnetic field.

9. The construction method for coordinated transient electromagnetic detection of regional exploration and treatment boreholes according to claim 8, characterized in that, After receiving the induced electromotive force of the secondary field using the receiving device, the process further includes: The induced electromotive force of the secondary field is processed to obtain the decay signal; The decay signal is inverted and converted into a spatial image, which is used to characterize the geological structure features of the area to be measured. The geological structure features include aquifer distribution, aquifer thickness and rock conductivity. Based on the spatial image analysis, the geological structure and water-bearing properties of the limestone within the preset distance range of the exploration and treatment borehole are determined. The preset distance range is 25 meters to 35 meters.

10. The construction method for regional exploration and treatment borehole-assisted transient electromagnetic detection according to claim 9, characterized in that, After exploring the area to be tested by combining the geological data and the induced electromotive force of the secondary field, the method further includes: Grouting treatment is performed on the area to be tested, and the exploration treatment hole is re-drilled to the second detection position, which is the same as the detection position of the directional branch bedding section; The probe is extended to the second detection position, and the primary field is emitted toward the second detection position; The induced electromotive force of the detection field is received, wherein the detection field is the eddy current field generated by the primary field at the second detection position; By comparing the induced electromotive force of the detection field and the induced electromotive force of the secondary field, the grouting treatment effect is quantitatively evaluated.

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