Investigation Methods of Deep Micro-logging

Abstract

The present invention provides a method for investigating deep micro-well logging. The method for investigating deep micro-well logging includes: a first acquisition step: collecting data on the initial well section of the deep micro-well logging to obtain first acquisition data; a layout step: lowering an optical fiber into the deep micro-well logging to allow the optical fiber to be vertically arranged in the entire well section of the deep micro-well logging; a coupling step: performing a well burying operation on the deep micro-well logging to couple the optical fiber; a second acquisition step: collecting data on the entire well section of the deep micro-well logging through the optical fiber to obtain second acquisition data; a conversion step: converting the first arrival time of the first acquisition data and the second acquisition data into a vertical propagation time; a replacement step: replacing the vertical propagation time of the second acquisition data with the vertical propagation time of the first acquisition data within the depth range of the initial well section; a data interpretation step: interpreting the replaced second acquisition data. The present invention solves the problem that the investigation method of deep micro-well logging in the prior art is difficult to implement.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum exploration, and in particular to a deep micro-well logging investigation method. Background Art

[0002] Surface survey is the main process in the early stage of seismic exploration. It is the process of obtaining geophysical parameters (velocity, depth and time) of near-surface strata through field collection methods. Surface survey can provide a basis for determining reasonable excitation factors and provide basic data for surface model establishment and static correction calculation. Surface survey is divided into surface data acquisition and surface data interpretation. Surface data acquisition is divided into seismic and non-seismic methods. Non-seismic methods include geological radar method, geological outcrop survey method and high-density electrical method, etc. Seismic acquisition methods include shallow refraction method, micro-logging method and surface wave exploration method. Among them, micro-logging is a method of using a borehole that penetrates the near-surface layer, excitation (reception) in the well and ground reception (excitation), and using the first arrival time of the transmitted wave to study the velocity and thickness of the near-surface layer. There are two methods of micro-logging survey: the source is in the well and the detector is on the surface; the source is on the surface and the detector is in the well. At present, surface surveys usually adopt the method of excitation in the well and reception on the ground.

[0003] There are a series of problems in using existing well excitation sources to complete micro-logging surveys at a depth of more than 500 meters. For example, when using detonator well excitation, the excitation system composed of detonators, leads and gun lines is heavy and wide in diameter, and cannot be placed in the excitation well. In addition, the longer the gun line, the greater the resistance, and the detonator excitation cannot be achieved. When using electric spark well excitation, the electric spark is excited in the mud in the well. The deeper the well, the greater the pressure of the mud on the cable, and the greater the force to lift the cable upward, which can easily cause the cable to break in the middle. In addition, since micro-logging drilling is an open hole well with no well wall protection measures, the vibration generated by high-power electric spark well excitation can easily cause well collapse, and the cable cannot be lifted up to complete subsequent collection. If VSP well receiving technology is used, the acquisition cost of surface micro-logging surveys will be greatly exceeded. Therefore, conventional well excitation, ground receiving acquisition methods and well receiving and ground excitation cannot complete deep micro-logging surveys at a depth of more than 500 meters.

[0004] As can be seen from the above, there is a problem in the prior art that the deep micro-well logging survey method is difficult to implement. Summary of the invention

[0005] The main purpose of the present invention is to provide a deep micro-logging investigation method to solve the problem that the deep micro-logging investigation method in the prior art is difficult to implement.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a method for investigating deep micro-well logging, comprising: a first acquisition step: collecting data on the initial well section of the deep micro-well logging to obtain first acquisition data; a layout step: lowering an optical fiber into the deep micro-well logging to allow the optical fiber to be vertically arranged in the entire well section of the deep micro-well logging; a coupling step: performing a well burying operation on the deep micro-well logging to couple the optical fiber; a second acquisition step: collecting data on the entire well section of the deep micro-well logging through the optical fiber to obtain second acquisition data; a conversion step: converting the first arrival time of the first acquisition data and the second acquisition data into a vertical propagation time; a replacement step: replacing the vertical propagation time of the second acquisition data with the vertical propagation time of the first acquisition data within the depth range of the initial well section; a data interpretation step: interpreting the replaced second acquisition data to complete the investigation of the entire well section of the deep micro-well logging.

[0007] Furthermore, in the conversion step, the conversion formula for converting the first arrival time to the vertical propagation time is:

[0008]

[0009] Wherein, T0 is the vertical propagation time, in ms; H is the depth of the receiving point or the excitation point in the deep micro-logging, in m; X is the distance between the excitation point or the receiving point on the ground and the wellhead of the deep micro-logging, in m; T is the first arrival time, in ms.

[0010] Furthermore, in the first acquisition step, electric spark excitation is used to acquire data from the initial well section of deep micro-logging.

[0011] Further, in the first acquisition step, the depth of the initial well section ranges from 0 m to 150 m.

[0012] Further, in the replacement step, replacing the vertical propagation time of the second acquisition data with the vertical propagation time of the first acquisition data within the depth range of the initial well section includes: determining the minimum available depth of the optical fiber receiving record in the well according to the continuity of the first arrival time of the first acquisition data; counting the number of excitation points of electric spark excitation within the depth range of the minimum available depth to 150m and the depth corresponding to each excitation point; counting the vertical propagation times of the first acquisition data and the second acquisition data corresponding to the depth corresponding to each excitation point, and calculating the root mean square difference of the two vertical propagation times; adding the root mean square difference to the vertical propagation time of the second acquisition data to replace the vertical propagation time of the second acquisition data with the vertical propagation time of the first acquisition data.

[0013] Furthermore, in the replacement step, the calculation formula of the root mean square difference is:

[0014]

[0015] Where ΔT is the root mean square difference; N is the number of excitation points; T i spar ker is the vertical propagation time of the first collected data, in ms; T i fiber It is the vertical propagation time of the second collected data, in ms.

[0016] Furthermore, in the laying step, there are at least two optical fibers.

[0017] Furthermore, in the laying step, lowering the optical fiber into the deep micro-logging includes: fixing the optical fiber on a steel wire rope, one end of the steel wire rope is connected to a weight, the weight has a steel outer mesh, and a fixed pulley is provided above the wellhead of the deep micro-logging. The steel wire rope and the optical fiber pass around the fixed pulley and enter the deep micro-logging under the drive of the weight.

[0018] Furthermore, in the coupling step, the well burying operation of the deep micro logging well includes: injecting mud into the deep micro logging well until the wellhead of the deep micro logging well is filled, and then backfilling the deep micro logging well with stones with a particle size of 0.5 cm to 2 cm.

[0019] Furthermore, in the coupling step, the gravel is backfilled in an interval backfilling manner. The interval backfilling is 0.5 hours of sedimentation after each backfilling for 1 hour, and the backfilling speed of the gravel is 1.18m 3 / h, and after the gravel is backfilled, the deep micro logging will be settled for 1 to 2 days.

[0020] Furthermore, in the second acquisition step, surface excitation is used to acquire data from the entire well section of the deep micro-logging.

[0021] Furthermore, in the data interpretation step, the data interpretation of the replaced second acquisition data includes: drawing a time-depth curve according to the vertical propagation time of the replaced second acquisition data; fitting the time-depth curve in segments according to the lithological logging data according to a linear law; calculating the velocity of each segment according to the slope of each segment on the time-depth curve; and calculating the thickness of each segment according to the depth difference of the intersection of each segment on the time-depth curve.

[0022] By applying the technical solution of the present invention, data is collected on the initial well section of the deep micro-logging to obtain first collected data, an optical fiber is lowered into the deep micro-logging to allow the optical fiber to be vertically arranged in the entire well section of the deep micro-logging, a well-burying operation is performed on the deep micro-logging to couple the optical fiber, data is collected on the entire well section of the deep micro-logging through the optical fiber to obtain second collected data, the first arrival times of the first collected data and the second collected data are converted into vertical propagation times, the vertical propagation time of the second collected data is replaced with the vertical propagation time of the first collected data within the depth range of the initial well section, and the replaced second collected data is collected. Data interpretation is performed to complete the investigation of the entire well section of deep micro logging. In this way, data is collected in the deep micro logging through optical fiber, and the second collection data of the deep micro logging can be accurately obtained. Since the data collected by the optical fiber in the initial well section of the deep micro logging is of poor quality and cannot be used for data interpretation, the vertical propagation time of the second collection data is replaced by the vertical propagation time of the first collection data within the depth range of the initial well section, so that the replaced second collection data has better quality in the entire well section, making the data interpretation of the deep micro logging more accurate, and solving the problem of the difficulty in implementing the investigation method of the deep micro logging in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0024] Figure 1 A flow chart showing a method for investigating deep micro-well logging in a specific embodiment of the present invention; and

[0025] Figure 2 A schematic diagram showing the variation of a single shot of the optical fiber after coupling in a specific embodiment of the present invention is shown;

[0026] Figure 3 A time-depth curve diagram of the first acquisition data and the second acquisition data before replacement in a specific embodiment of the present invention is shown;

[0027] Figure 4 A time-depth curve diagram of the second acquired data after replacement in a specific embodiment of the present invention is shown;

[0028] Figure 5 A diagram showing the results of deep micro-logging data interpretation in a specific embodiment of the present invention is shown. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0031] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0032] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0033] In order to solve the problem that the deep micro-logging investigation method in the prior art is difficult to implement, the present invention provides a deep micro-logging investigation method.

[0034] like Figure 1 As shown, the investigation method of deep micro logging includes: a first acquisition step: collecting data on the initial well section of the deep micro logging to obtain first acquisition data; a layout step: lowering the optical fiber into the deep micro logging to make the optical fiber vertically arranged in the whole well section of the deep micro logging; a coupling step: performing well burying operation on the deep micro logging to couple the optical fiber; a second acquisition step: collecting data on the whole well section of the deep micro logging through the optical fiber to obtain second acquisition data; a conversion step: converting the first arrival time of the first acquisition data and the second acquisition data into the vertical propagation time; a replacement step: replacing the vertical propagation time of the second acquisition data with the vertical propagation time of the first acquisition data within the depth range of the initial well section; a data interpretation step: interpreting the replaced second acquisition data to complete the investigation of the whole well section of the deep micro logging.

[0035] Data is collected in the initial well section of the deep micro-logging to obtain the first collected data, an optical fiber is lowered into the deep micro-logging to make the optical fiber vertically arranged in the whole well section of the deep micro-logging, the deep micro-logging is buried to couple the optical fiber, and data is collected in the whole well section of the deep micro-logging through the optical fiber to obtain the second collected data, the first arrival time of the first collected data and the second collected data is converted into the vertical propagation time, the vertical propagation time of the second collected data is replaced with the vertical propagation time of the first collected data within the depth range of the initial well section, the replaced second collected data is interpreted, and the investigation of the whole well section of the deep micro-logging is completed. In this way, data collection in the deep micro-logging through the optical fiber can accurately obtain the second collected data of the deep micro-logging. Since the data collected by the optical fiber in the initial well section of the deep micro-logging is of poor quality and cannot be used for data interpretation, the vertical propagation time of the second collected data is replaced with the vertical propagation time of the first collected data within the depth range of the initial well section, so that the replaced second collected data has good quality in the whole well section, making the data interpretation of the deep micro-logging more accurate.

[0036] In this embodiment, in the first acquisition step, electric spark excitation is used to collect data from the initial well section of deep micro logging. Specifically, electric spark excitation in the well is an instantaneous discharge in the well, and the electric spark vaporizes water to generate vibrations to form seismic waves. The acquisition steps include: drilling and keeping water in the well; lowering the cable to the designed position; exciting and recording data; pulling up the cable to excite again. Of course, detonator excitation can also be used to collect data from the initial well section of deep micro logging, which can achieve the same acquisition effect and can be selected according to actual needs.

[0037] Specifically, in the first acquisition step, since the power of the electric spark device determines its maximum acquisition depth, and the safe use power of the electric spark device is limited, the depth range of the initial well section is 0m to 150m.

[0038] The spark device is excited in the well and received and collected on the ground. Specifically, the ground receiving detector is a conventional string detector. There are 12 ground receiving detectors, which are arranged in a tree shape with the wellhead as the center, and the offset distances are 2m, 3m, 4m, 5m, 7m and 9m respectively.

[0039] In this embodiment, in the laying step, there are at least two optical fibers. Using two optical fibers can reduce the risk of damage to the optical fibers during the process of running them down the well, and ensure smooth laying of the optical fibers.

[0040] In this embodiment, in the laying step, lowering the optical fiber into the deep micro-well logging includes: fixing the optical fiber on a steel wire rope, one end of the steel wire rope is connected to a weight, the weight has a steel bar outer net, and a fixed pulley is provided above the wellhead of the deep micro-well logging, and the steel wire rope and the optical fiber bypass the fixed pulley and enter the deep micro-well logging driven by the weight. The optical fiber is only fixed to the steel wire rope to ensure that the optical fiber is not affected by gravity when the weight is lowered into the well. By connecting the weight to one end of the steel wire rope and providing a steel bar outer net on the weight, it is ensured that the weight drives the optical fiber to go down the well smoothly, and the weight does not rotate during the process of going down the well. Specifically, the process of lowering the optical fiber into the well is uniform. In addition, there is a meter mark on the optical fiber, and the depth of the optical fiber going down the well is controlled by the meter mark.

[0041] In this embodiment, after the laying step is completed, it is also necessary to use a fiber optic time domain instrument to perform a continuity test on the optical fiber that has been lowered into the well to ensure the normal use of the optical fiber.

[0042] In this embodiment, in the coupling step, the burying operation of the deep micro-logging includes: injecting mud into the deep micro-logging well until the wellhead of the deep micro-logging well is filled, and then backfilling stones into the deep micro-logging well. Specifically, a hose is used to protect the optical fiber before burying the well. When the mud is filled to the wellhead, a burying funnel is installed at the wellhead, and stones with a particle size of 0.5 cm to 2 cm are backfilled through the burying funnel, and the funnel mouth cannot contact the optical fiber.

[0043] In this embodiment, in the coupling step, the stone is backfilled in an interval backfilling manner. The interval backfilling is 0.5 hours of sedimentation after each backfilling for 1 hour. The backfilling speed of the stone is 1.18m 3 / h, and after the gravel is backfilled, the deep micro-logging is settled for 1 to 2 days. In addition, after the well burial operation is completed, it is necessary to use a fiber optic time domain instrument to perform a continuity test on the optical fiber that has been lowered into the well to ensure that the optical fiber is not broken.

[0044] like Figure 2 As shown in the figure, the first part is a single shot collected by vibrator after the wellhead is filled with mud. The first arrival wave recorded by the single shot cannot be identified due to noise. The second part is a single shot collected after the well is backfilled with gravel. The first arrival wave recorded by the single shot has poor continuity and low signal-to-noise ratio. The third part is a single shot collected after the well is buried and settled for 2 days. The first arrival wave recorded by the single shot has good continuity and high signal-to-noise ratio, ensuring accurate first arrival time picking.

[0045] In this embodiment, in the second acquisition step, ground excitation is used to collect data for the entire well section of the deep micro-logging. Specifically, the ground excitation source is a controllable seismic source, and the distance between the excitation point and the wellhead of the deep micro-logging is in the range of 2m to 10m. The spatial sampling interval of the optical fiber is 0.1m, and the sampling interval of the recording time is 0.1ms. The controllable seismic source is excited multiple times at the same offset distance, and the signal-to-noise ratio of the recorded first arrival wave is improved by vertical stacking.

[0046] In this embodiment, in the conversion step, the conversion formula for converting the first arrival time to the vertical propagation time is:

[0047]

[0048] Wherein, T0 is the vertical propagation time, in ms; H is the depth of the receiving point or the excitation point in the deep micro-logging, in m; X is the distance between the excitation point or the receiving point on the ground and the wellhead of the deep micro-logging, in m; T is the first arrival time, in ms.

[0049] In this embodiment, in the replacement step, replacing the vertical propagation time of the second acquisition data with the vertical propagation time of the first acquisition data within the depth range of the initial well section includes: determining the minimum available depth of the optical fiber receiving record in the well according to the continuity of the first arrival time of the first acquisition data; counting the number of excitation points of electric spark excitation within the depth range of the minimum available depth to 150m and the depth corresponding to each excitation point; counting the vertical propagation times of the first acquisition data and the second acquisition data corresponding to the depth corresponding to each excitation point, and calculating the root mean square difference between the two vertical propagation times; adding the root mean square difference to the vertical propagation time of the second acquisition data to replace the vertical propagation time of the second acquisition data with the vertical propagation time of the first acquisition data.

[0050] Specifically, in the replacement step, the calculation formula of the root mean square difference is:

[0051]

[0052] Where ΔT is the root mean square difference; N is the number of excitation points; T i spar ker is the vertical propagation time of the first collected data, in ms; T i fiber It is the vertical propagation time of the second collected data, in ms.

[0053] like Figure 3 to Figure 4 As shown, the minimum available depth of the optical fiber receiving record in the well is 20m. In the depth range of 20m to 150m, the time-depth curves of the first acquisition data and the second acquisition data basically overlap. In the depth range of 0m to 20m, the vertical propagation time of the second acquisition data is replaced by the vertical propagation time of the first acquisition data.

[0054] like Figure 5As shown, in the data interpretation step, the data interpretation of the replaced second acquisition data includes: drawing a time-depth curve according to the vertical propagation time of the replaced second acquisition data; fitting the time-depth curve in segments according to the lithological logging data according to a linear law; obtaining the velocity of each segment according to the slope of each segment on the time-depth curve; and obtaining the thickness of each segment according to the depth difference of the intersection of each segment on the time-depth curve.

[0055] From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: by collecting data on the initial well section of the deep micro-logging to obtain first collection data, lowering the optical fiber into the deep micro-logging to make the optical fiber vertically arranged in the whole well section of the deep micro-logging, performing a well-burying operation on the deep micro-logging to couple the optical fiber, collecting data on the whole well section of the deep micro-logging through the optical fiber to obtain second collection data, converting the first arrival time of the first collection data and the second collection data into the vertical propagation time, and replacing the vertical propagation time of the second collection data with the vertical propagation time of the first collection data within the depth range of the initial well section. The vertical propagation time of the collected data is calculated, and the replaced second collected data is interpreted to complete the investigation of the entire well section of the deep micro logging. In this way, data collection in the deep micro logging is performed through optical fiber, and the second collected data of the deep micro logging can be accurately obtained. Since the data collected by the optical fiber in the initial well section of the deep micro logging is of poor quality and cannot be used for data interpretation, the vertical propagation time of the second collected data is replaced by the vertical propagation time of the first collected data within the depth range of the initial well section, so that the replaced second collected data has better quality in the entire well section, making the data interpretation of the deep micro logging more accurate.

[0056] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0057] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A deep micro-well logging survey method, characterized in that: include: The first acquisition step: acquiring data from the initial well section of the deep micro-logging to obtain first acquisition data; Laying step: lowering the optical fiber into the deep micro-well logging, so that the optical fiber is vertically arranged in the whole well section of the deep micro-well logging; Coupling step: performing a well burying operation on the deep micro-well logging to couple the optical fiber; The second acquisition step: performing the data acquisition on the entire well section of the deep micro-well logging through the optical fiber to obtain the second acquisition data; Conversion step: converting the first arrival time of the first acquisition data and the second acquisition data into a vertical propagation time; Replacing step: replacing the vertical propagation time of the second acquisition data with the vertical propagation time of the first acquisition data within the depth range of the initial well section; Data interpretation step: interpreting the replaced second acquired data to complete the investigation of the entire well section of the deep micro logging; In the conversion step, the conversion formula for converting the first arrival time to the vertical propagation time is: Wherein, T0 is the vertical propagation time, in ms; H is the depth of the receiving point or the excitation point in the deep micro-logging, in m; X is the distance between the excitation point or the receiving point on the ground and the wellhead of the deep micro-logging, in m; T is the first arrival time, in ms; In the first acquisition step, electric spark excitation is used to acquire data from the initial well section of the deep micro-logging; In the first acquisition step, the depth of the initial well section ranges from 0 m to 150 m; In the replacing step, replacing the vertical propagation time of the second acquisition data with the vertical propagation time of the first acquisition data within the depth range of the initial well section comprises: Determining the minimum available depth of the optical fiber in the well for receiving records according to the continuity of the first arrival time of the first acquisition data; Counting the number of excitation points of the electric spark excitation within the depth range from the minimum available depth to 150 m and the depth corresponding to each of the excitation points; Counting the vertical propagation times of the first acquisition data and the second acquisition data respectively corresponding to the depths corresponding to the excitation points, and calculating the root mean square difference of the two vertical propagation times; Adding the RMS difference to the vertical propagation time of the second acquisition data to replace the vertical propagation time of the second acquisition data with the vertical propagation time of the first acquisition data; In the replacement step, the calculation formula of the root mean square difference is: Wherein, ΔT is the root mean square difference; N is the number of the excitation points; T i spar ker is the vertical propagation time of the first collected data, in ms; T i fiber is the vertical propagation time of the second collected data, in ms In the data interpretation step, the data interpretation of the replaced second collected data includes: Draw a time-depth curve according to the vertical propagation time of the replaced second acquisition data; The time-depth curve is segmentedly fitted according to the lithology logging data in accordance with a linear rule; Calculating the speed of each segment according to the slope of each segment on the time-depth curve; The thickness of each segment is calculated based on the depth difference of the intersection points of each segment on the time-depth curve.

2. The deep micro-well logging investigation method according to claim 1, characterized in that: In the laying step, there are at least two optical fibers.

3. The deep micro-well logging investigation method according to claim 1, characterized in that: In the laying step, lowering the optical fiber into the deep micro-well logging comprises: The optical fiber is fixed on a steel wire rope, one end of which is connected to a weight, the weight has a steel outer mesh, and a fixed pulley is provided above the wellhead of the deep micro-logging. The steel wire rope and the optical fiber pass around the fixed pulley and enter the deep micro-logging driven by the weight.

4. The deep micro-well logging investigation method according to claim 1, characterized in that: In the coupling step, the deep micro-well logging operation includes: Mud is injected into the deep micro-logging well until the wellhead of the deep micro-logging well is filled, and stones with a particle size of 0.5 cm to 2 cm are backfilled into the deep micro-logging well through a buried well funnel.

5. The deep micro-well logging investigation method according to claim 4, characterized in that: In the coupling step, the stones are backfilled in an interval backfilling manner, wherein the interval backfilling is 0.5 hours of sedimentation after each backfilling for 1 hour, and the backfilling speed of the stones is 1.18 m / s. 3 / h, and after the gravel is backfilled, the deep micro logging is settled for 1 to 2 days.

6. The deep micro-well logging investigation method according to claim 1, characterized in that: In the second acquisition step, the data is acquired for the entire well section of the deep micro-logging by using surface excitation.

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