Carbon dioxide saturation monitoring device and method based on fiber-optic-active heating

Abstract

The application discloses a kind of carbon dioxide saturation monitoring device and method based on optical fiber-active heating method, the carbon dioxide saturation monitoring device based on optical fiber-active heating method includes: heating system, temperature acquisition system and monitoring system, the monitoring system is buried at the drilling position of rock mass, the monitoring system is respectively with the heating system and the monitoring system electric connection.The carbon dioxide saturation monitoring device based on optical fiber-active heating method in the embodiment of the application is realized by being arranged in deep well monitoring device, in combination with the high-precision temperature acquisition function of DTS demodulator, the continuous monitoring of target formation temperature change is realized, and the change of target formation carbon dioxide saturation is calculated, to provide technical support for geological storage.

Description

Technical Field

[0001] This invention relates to the field of geological monitoring technology, and in particular to a carbon dioxide saturation monitoring device and method based on fiber optic active heating. Background Technology

[0002] Currently, in carbon dioxide geological storage projects, carbon dioxide saturation is typically monitored to reflect its distribution in the reservoir. However, due to the usually large injection depth, accurately monitoring carbon dioxide saturation is an extremely challenging task. Fiber optic monitoring technology, with its extremely high sensitivity and real-time performance, can effectively reflect changes in temperature, strain, and vibration in the external environment, and therefore has been widely used in the monitoring field.

[0003] After carbon dioxide is injected into the reservoir, it significantly alters the thermal conductivity of the rock mass by displacing pore water. Based on this principle, a pressing technical problem is how to establish a quantitative relationship between temperature, time, thermal conductivity of the rock / soil medium, and carbon dioxide saturation through active heating combined with thermodynamic theory, and how to monitor carbon dioxide saturation using this quantitative relationship. Summary of the Invention

[0004] In view of the above problems, the present invention is proposed to provide a carbon dioxide saturation monitoring device and method based on fiber optic active heating method to overcome or at least partially solve the above problems.

[0005] Other features and advantages of the invention will become apparent from the following detailed description, or may be learned in part by practice of the invention.

[0006] According to a first aspect of the present invention, a carbon dioxide saturation monitoring device based on fiber optic active heating is provided. The device includes a heating system, a temperature acquisition system, and a monitoring system. The monitoring system is embedded at a borehole location in a rock mass and is electrically connected to both the heating system and the temperature acquisition system. The monitoring system is used to generate a target environment using the fiber optic active heating method. The heating system provides the electrical energy required for heating the monitoring system, and the temperature acquisition system acquires temperature data from the monitoring system.

[0007] The monitoring system includes a wiring box and a monitoring tube. The monitoring tube is buried at the drill hole location in the rock mass. The upper end of the monitoring tube is connected to the wiring box, which is located on the outside of the rock mass. The wiring box connects the monitoring tube to the heating system and the monitoring tube to the temperature acquisition system. The wiring box includes at least an electric heating connection port and a temperature data transmission port. The electric heating connection port is electrically connected to the heating system, and the temperature data transmission port is electrically connected to the temperature acquisition system.

[0008] In some embodiments of the present invention, the carbon dioxide saturation monitoring device based on the fiber optic-active heating method further includes a terminal, which is connected to the temperature acquisition system and is used to determine the carbon dioxide saturation data of the target formation based on the temperature data acquired by the temperature acquisition system.

[0009] In some embodiments of the present invention, a cavity is hollowed out between the inner wall and the outer wall of the monitoring tube, and multiple sensors are uniformly spaced in the cavity.

[0010] In some embodiments of the present invention, the diameter of the outer wall matches the inner diameter of the borehole.

[0011] In some embodiments of the present invention, the sensor includes a steel pipe, a flange, a heating resistance wire, and a temperature measuring optical cable. The steel pipe is a hollow cylindrical structure, and the flanges are respectively provided at both ends of the steel pipe. The heating resistance wire and the temperature measuring optical cable are respectively threaded through the flanges. The heating resistance wire is electrically connected to the heating system through the electric heating connection port.

[0012] In some embodiments of the present invention, the heating system includes a power supply, a voltage regulator, and wires, wherein the voltage regulator is electrically connected to the power supply and the electric heating connection port via the wires.

[0013] In some embodiments of the present invention, a control switch is provided on the wire between the power supply and the voltage regulator.

[0014] In some embodiments of the present invention, the temperature acquisition system includes a DTS demodulator and a jumper, wherein the DTS demodulator is electrically connected to the temperature data transmission port via the jumper.

[0015] According to a second aspect of the present invention, a carbon dioxide saturation monitoring device based on the fiber optic-active heating method is provided, comprising the following steps:

[0016] S1. Deploy the monitoring system at the designated drilling location, and connect the corresponding connection ports of the heating resistance wire and temperature measuring optical cable in the circuit integration box, namely the electric heating connection port and the temperature data transmission port, to the heating system and the temperature acquisition system respectively.

[0017] S2. Before the heating system starts working, the initial data is read through the temperature acquisition system to confirm that the heating system and the temperature acquisition system are in normal working condition; the power supply, control switch and voltage regulator of the heating system are turned on in sequence to continuously heat the heating resistance wire, and the heating time is recorded at the same time; the temperature data of the temperature acquisition system is read in real time through the DTS demodulator; after the heating time reaches the set time, the power supply, control switch and voltage regulator are turned off to stop the heating of the heating resistance wire, and the temperature data read by the DTS demodulator is saved.

[0018] S3. Determine the carbon dioxide saturation data of the target formation based on the temperature data.

[0019] In some embodiments of the present invention, step S3, determining the target formation carbon dioxide saturation data based on the temperature data, includes:

[0020] Based on the temperature change Δ T logarithm of the heating set time ln t Linear relationship: Therefore, the thermal conductivity λ of the soil and rock medium is calculated, where t is the set heating time, and Δ is the thermal conductivity λ. T This represents the change in temperature data within a set heating time t. q This refers to the amount of heat transferred per unit length of heating resistance wire per unit time. λ Thermal conductivity of the soil and rock medium M It is a constant;

[0021] Based on the thermal conductivity of the soil and rock medium λ With the water saturation in the rock mass S w The quantitative relationship was used to calculate and determine the water saturation in the rock mass. S w And the saturation level of carbon dioxide 1- S w .

[0022] The technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0023] The carbon dioxide saturation monitoring device and method based on the fiber optic-active heating method described in this invention embodiment achieves continuous monitoring of the temperature changes of the target formation by deploying monitoring devices in deep wells and combining them with the high-precision temperature acquisition function of the DTS demodulator, and calculates the changes in carbon dioxide saturation of the target formation, thus providing technical support for geological storage.

[0024] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the principle structure of a carbon dioxide saturation monitoring device based on the fiber optic-active heating method provided in an embodiment of the present invention;

[0027] Figure 2 This is a longitudinal cross-sectional schematic diagram of the monitoring system in an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the sensor in an embodiment of the present invention;

[0029] Figure 4 A flowchart of a carbon dioxide saturation monitoring method based on fiber optic active heating provided for an embodiment of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Heating system; 2. Temperature acquisition system; 3. Monitoring system; 4. Voltage regulator; 5. Control switch; 6. Power supply; 7. Wire; 8. DTS demodulator; 9. Jumper wire; 10. Circuit box; 11. Sensor; 12. Outer wall; 13. Inner wall; 14. Heating resistance wire; 15. Temperature measuring optical cable; 16. Flange; 17. Steel pipe; 18. Terminal. Detailed Implementation

[0032] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings.

[0033] The accompanying drawings illustrate various structural schematics according to embodiments of the present disclosure. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0034] In the context of this disclosure, when a layer / component is referred to as being "above" another layer / component, that layer / component may be directly above the other layer / component, or there may be an intermediate layer / component between them. Additionally, if a layer / component is "above" another layer / component in one orientation, then when the orientation is reversed, that layer / component may be "below" the other layer / component. In the context of this disclosure, similar or identical components may be denoted by the same or similar reference numerals.

[0035] To better understand the above technical solutions, the following will describe the above technical solutions in detail with reference to specific implementation methods. It should be understood that the embodiments of this disclosure and the specific features in the embodiments are detailed descriptions of the technical solutions of the present invention, rather than limitations on the technical solutions of the present invention. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other.

[0036] Figure 1 This is a schematic diagram illustrating the principle structure of a carbon dioxide saturation monitoring device based on the fiber optic-active heating method, as provided in an embodiment of the present invention. Figure 1 As shown, the carbon dioxide saturation monitoring device based on the fiber-optic active heating method includes: a heating system 1, a temperature acquisition system 2, and a monitoring system 3. The monitoring system 3 is buried at the borehole location in the rock mass and is electrically connected to both the heating system 1 and the temperature acquisition system 2. The monitoring system 3 is used to generate a target environment through the fiber-optic active heating method. The target environment is the working environment for monitoring the carbon dioxide saturation of the target stratum, in order to establish a quantitative relationship between temperature, time, thermal conductivity of the rock and soil medium, and carbon dioxide saturation. The heating system 1 is used to provide the electrical energy required for heating the monitoring system 3, and the temperature acquisition system 2 is used to acquire temperature data from the monitoring system 3.

[0037] Combination Figure 2 As shown, Figure 2This is a longitudinal cross-sectional schematic diagram of the monitoring system 3 in this embodiment of the invention. The monitoring system 3 includes a wiring integration box 10 and a monitoring tube. The monitoring tube is buried at the drill hole location in the rock mass. The upper end of the monitoring tube is connected to the wiring integration box 10. The wiring integration box 10 is located on the outside of the rock mass. The wiring integration box 10 is used to integrate various wirings and provide connection ports. The wiring integration box 10 connects the monitoring tube to the heating system 1 and connects the monitoring tube to the temperature acquisition system 2. The wiring integration box 10 includes at least an electric heating connection port and a temperature data transmission port. The electric heating connection port is electrically connected to the heating system 1, and the temperature data transmission port is electrically connected to the temperature acquisition system 2.

[0038] The monitoring tube has a cavity between its inner wall 13 and outer wall 12. Multiple sensors 11 are evenly spaced within this cavity. The cavity serves to hold and fix the sensors 11, preventing deformation or displacement. The evenly spaced sensors 11 allow for temperature sensing from all directions, improving data accuracy. The number of sensors 11 can be selected based on actual application requirements. For example, in this embodiment, there are four sensors 11. In other embodiments, the number of sensors 11 can be three, five, or other quantities.

[0039] Combination Figure 3 As shown, Figure 3 This is a schematic diagram of sensor 11 in an embodiment of the present invention. Sensor 11 includes a steel pipe 17, a flange 16, a heating resistance wire 14, and a temperature measuring optical cable 15. The steel pipe 17 is a hollow cylindrical structure, and the flange 16 is respectively provided at both ends of the steel pipe 17. The heating resistance wire 14 and the temperature measuring optical cable 15 are respectively threaded through the flange 16. The flange 16 is used to fix the heating resistance wire 14 and the temperature measuring optical cable 15 to prevent them from moving relative to each other. The steel pipe 17 wraps the heating resistance wire 14, the temperature measuring optical cable 15, and the flange 16, providing additional mechanical protection and enhancing the overall structural strength. The heating resistance wire 14 is electrically connected to the heating system 1 through the electric heating connection port, and the heating resistance wire 14 plays the role of active heating. The temperature measuring optical cable 15 is electrically connected to the temperature acquisition system 2, and the temperature measuring optical cable 15 is used to sense the temperature information of the surrounding environment.

[0040] The heating system 1 includes a power supply 6, a voltage regulator 4, a control switch 5, and a wire 7. The voltage regulator 4 is electrically connected to the power supply 6 and the electric heating connection port via the wire 7. The control switch 5 is installed on the wire 7 between the power supply 6 and the voltage regulator 4. The power supply 6 provides energy for heating the heating resistance wire 14 in the monitoring system 3. The voltage regulator 4 can control the output of the power supply 6 to achieve different power heating conditions, thereby adapting to different monitoring needs. The control switch 5 is used to control the start and stop of the heating process.

[0041] The temperature acquisition system 2 includes a DTS demodulator 8 and a jumper 9. The DTS demodulator 8 is electrically connected to the line integration box 10 through the jumper 9. The jumper 9 is electrically connected to the temperature measuring optical cable 15 through the temperature data transmission port. The jumper 9 is used to transmit optical information of the temperature acquisition system 2 and the monitoring system 3. The DTS demodulator 8 is used to acquire the temperature information collected by the temperature measuring optical cable 15.

[0042] Specifically, in this embodiment of the invention, the monitoring system 3 is deployed at a designated borehole location. The diameter of the outer wall 12 matches the inner diameter of the borehole. For example, the inner diameter of the borehole is 140 mm, and the diameter of the outer wall 12 can be selected as 140 mm, ensuring that the outer wall 12 of the monitoring system 3 is in close contact with the surrounding rock mass, thus stabilizing the entire monitoring system 3. Subsequently, the corresponding connection ports of the heating resistance wire 14 and the temperature measuring optical cable 15 in the circuit integration box 10, namely the electric heating connection port and the temperature data transmission port, are respectively connected to the heating system 1 and the temperature acquisition system 2.

[0043] Before heating system 1 starts operating, initial data is read through temperature acquisition system 2 to confirm that both heating system 1 and temperature acquisition system 2 are in normal working condition. The power supply 6, control switch 5, and voltage regulator 4 of heating system 1 are sequentially activated to continuously heat the heating resistance wire 14, while recording the heating time. Temperature data from temperature acquisition system 2 is read in real time through DTS demodulator 8. After the set heating time is reached, the power supply 6, control switch 5, and voltage regulator 4 are turned off to stop heating the heating resistance wire 14, and the temperature data read by DTS demodulator 8 is saved.

[0044] In this embodiment of the invention, the carbon dioxide saturation monitoring device based on the fiber-optic active heating method may further include a terminal 18, which is connected to the temperature acquisition system 2 and is used to determine the carbon dioxide saturation data of the target formation based on the temperature data acquired by the temperature acquisition system 2. The terminal 18 is, for example, a PC, server, or smartphone, or other terminal device with computing capabilities. Specifically, this embodiment of the invention can determine the carbon dioxide saturation data of the target formation based on the temperature change ΔT and the logarithm of the set heating time ln. tLinear relationship: The thermal conductivity λ of the soil and rock medium is then calculated. The set heating time t can be recorded via the terminal 18, a stopwatch, or other timing devices. T The temperature data is acquired through temperature acquisition system 2, specifically the change in temperature within a set heating time t. q represents the heat transferred per unit length of heating resistance wire 14 per unit time, λ is the thermal conductivity of the soil / rock medium, and M is a constant related to the properties of the soil / rock medium, which can be obtained beforehand. Under constant heating power, the change can be determined via Δ... T -ln t The slope of the straight line is used to calculate λ. Combined with the quantitative relationship between the thermal conductivity λ of the soil and rock mass and the water saturation Sw in the rock mass, which was previously calibrated in indoor tests, the terminal 18 can determine the water saturation in the rock mass. S w And the saturation level of carbon dioxide 1- S w (Assuming the pores are completely filled with water and carbon dioxide).

[0045] In other embodiments of the present invention, if the application scenario is such that it is inconvenient to use the terminal 18 outdoors, the terminal 18 can be omitted, and the target formation carbon dioxide saturation data can be manually calculated and derived based on the linear relationship between the temperature change ΔT and the logarithm of the heating time lnt.

[0046] The carbon dioxide saturation monitoring device based on the fiber optic-active heating method described in this embodiment of the invention achieves continuous monitoring of the temperature changes of the target formation by deploying the monitoring device in a deep well and combining it with the high-precision temperature acquisition function of the DTS demodulator 8. It also calculates the changes in carbon dioxide saturation of the target formation, providing technical support for geological storage. The heating system 1 provides energy to the heating resistance wire 14 and can flexibly adjust the heating time and power according to the needs of different target formations to ensure the scientific validity and rationality of the monitoring results. Through the reasonable design and arrangement of the flange 16, inner wall 13, and outer wall 12, the heating resistance wire 14 and temperature measurement... The optical cable 15 remains stable in the deep well, unaffected by external strain, thus reliably capturing the temperature information of the target formation. The sensor 11 is deployed in multiple different directions, which helps to obtain more comprehensive monitoring data, facilitates the analysis and comparison of carbon dioxide distribution in different directions, and improves the accuracy and comprehensiveness of the monitoring results. In addition, the distance between the heating resistance wire 14, the temperature measuring optical cable 15 and the target formation is extremely small, ensuring that the temperature changes of the three are highly consistent. The temperature information obtained through the temperature measuring optical cable 15 can accurately reflect the actual environmental changes of the target formation, thereby ensuring the authenticity and reliability of the monitoring.

[0047] Based on the above embodiments, the present invention also provides a carbon dioxide saturation monitoring method based on fiber optic-active heating, applicable to any embodiment of the above-described carbon dioxide saturation monitoring device based on fiber optic-active heating, see reference. Figure 4 As shown, the carbon dioxide saturation monitoring method based on fiber optic active heating includes the following steps:

[0048] S1. The monitoring system 3 is deployed at the designated drilling location. The corresponding connection ports of the heating resistance wire 14 and the temperature measuring optical cable 15 in the circuit integration box 10, namely the electric heating connection port and the temperature data transmission port, are connected to the heating system 1 and the temperature acquisition system 2, respectively.

[0049] S2. Before the heating system 1 starts working, the initial data is read through the temperature acquisition system 2 to confirm that the heating system 1 and the temperature acquisition system 2 are in normal working condition; the power supply 6, control switch 5 and voltage regulator 4 of the heating system 1 are turned on in sequence to continuously heat the heating resistance wire 14, and the heating time is recorded at the same time; the temperature data of the temperature acquisition system 2 is read in real time through the DTS demodulator 8; after the heating time reaches the set time, the power supply 6, control switch 5 and voltage regulator 4 are turned off to stop the heating of the heating resistance wire 14, and the temperature data read by the DTS demodulator 8 is saved.

[0050] S3. Determine the carbon dioxide saturation data of the target formation based on the temperature data.

[0051] In this embodiment of the invention, step S3, determining the target formation carbon dioxide saturation data based on the temperature data, includes:

[0052] Based on the temperature change Δ T logarithm of the heating set time ln t Linear relationship: Therefore, the thermal conductivity λ of the soil and rock medium is calculated, where t is the set heating time, and Δ is the thermal conductivity λ. T This represents the change in temperature data within a set heating time t. q This refers to the amount of heat transferred per unit length of heating resistance wire per unit time. λ Thermal conductivity of the soil and rock medium M These are constants related to the properties of the soil and rock mass.

[0053] Based on the thermal conductivity of the soil and rock medium λ With the water saturation in the rock mass S w The quantitative relationship was used to calculate and determine the water saturation in the rock mass. S w And the saturation level of carbon dioxide 1- S w .

[0054] The carbon dioxide saturation monitoring device based on the fiber optic-active heating method described in the above embodiments can execute the carbon dioxide saturation monitoring method based on the fiber optic-active heating method provided in the embodiments of the present invention. The carbon dioxide saturation monitoring method based on the fiber optic-active heating method has the corresponding functional components and beneficial effects of the carbon dioxide saturation monitoring device based on the fiber optic-active heating method described in the above embodiments. For details, please refer to the embodiments of the carbon dioxide saturation monitoring device based on the fiber optic-active heating method described above. The embodiments of the present invention will not be repeated here.

[0055] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0056] Similarly, it should be understood that, in order to streamline this disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof. However, this method of disclosure should not be interpreted as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the claims, inventive aspects lie in fewer than all features of a single foregoing disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of the invention.

[0057] It should be noted that the above embodiments are illustrative of the invention and not restrictive of the invention, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims.

Claims

1. A carbon dioxide saturation monitoring device based on fiber optic-active heating method, characterized in that, The carbon dioxide saturation monitoring device based on the fiber-optic active heating method includes a heating system, a temperature acquisition system, and a monitoring system. The monitoring system is embedded at the borehole location in the rock mass and is electrically connected to both the heating system and the temperature acquisition system. The monitoring system is used to generate a target environment using the fiber-optic active heating method. The heating system provides the electrical energy required for heating the monitoring system, and the temperature acquisition system acquires temperature data from the monitoring system. The monitoring system includes a wiring box and a monitoring tube. The monitoring tube is buried at the drill hole location in the rock mass. The upper end of the monitoring tube is connected to the wiring box, which is located on the outside of the rock mass. The wiring box connects the monitoring tube to the heating system and the monitoring tube to the temperature acquisition system. The wiring box includes at least an electric heating connection port and a temperature data transmission port. The electric heating connection port is electrically connected to the heating system, and the temperature data transmission port is electrically connected to the temperature acquisition system. The monitoring tube has a cavity between its inner and outer walls, and multiple sensors are evenly spaced within the cavity. Each sensor includes a steel pipe, a flange, a heating resistance wire, and a temperature-measuring optical cable. The steel pipe is a hollow cylindrical structure, with flanges at both ends. The heating resistance wire and the temperature-measuring optical cable are threaded through the flanges, respectively. The heating resistance wire is electrically connected to the heating system via an electric heating connection port. The carbon dioxide saturation monitoring device based on the fiber-optic active heating method also includes a terminal, which is connected to the temperature acquisition system and is used to determine the carbon dioxide saturation data of the target formation based on the temperature data acquired by the temperature acquisition system. The terminal determines the target formation carbon dioxide saturation data based on the temperature data acquired by the temperature acquisition system, including: based on the temperature change Δ... T logarithm of the heating set time ln t Linear relationship: Therefore, the thermal conductivity λ of the soil and rock medium is calculated, where t is the set heating time, and Δ is the thermal conductivity λ. T This represents the change in temperature data within a set heating time t. q This refers to the amount of heat transferred per unit length of heating resistance wire per unit time. λ Thermal conductivity of the soil and rock medium M It is a constant; and based on the thermal conductivity of the soil and rock medium λ With the water saturation in the rock mass S w The quantitative relationship was used to calculate and determine the water saturation in the rock mass. S w And the saturation level of carbon dioxide 1- S w .

2. The carbon dioxide saturation monitoring device based on the fiber optic-active heating method according to claim 1, characterized in that: The diameter of the outer wall matches the inner diameter of the borehole.

3. The carbon dioxide saturation monitoring device based on the fiber optic-active heating method according to claim 1, characterized in that: The heating system includes a power supply, a voltage regulator, and wires. The voltage regulator is electrically connected to the power supply and the electric heating connection port via the wires.

4. The carbon dioxide saturation monitoring device based on the fiber optic-active heating method according to claim 3, characterized in that: A control switch is installed on the wire between the power supply and the voltage regulator.

5. The carbon dioxide saturation monitoring device based on fiber optic-active heating method according to claim 1, characterized in that: The temperature acquisition system includes a DTS demodulator and a jumper, and the DTS demodulator is electrically connected to the temperature data transmission port through the jumper.

6. A carbon dioxide saturation monitoring method based on fiber optic active heating, applied to the carbon dioxide saturation monitoring device based on fiber optic active heating as described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Deploy the monitoring system at the designated drilling location, and connect the corresponding connection ports of the heating resistance wire and temperature measuring optical cable in the circuit integration box, namely the electric heating connection port and the temperature data transmission port, to the heating system and the temperature acquisition system respectively. S2. Before the heating system starts working, the initial data is read through the temperature acquisition system to confirm that the heating system and the temperature acquisition system are in normal working condition; the power supply, control switch and voltage regulator of the heating system are turned on in sequence to continuously heat the heating resistance wire, and the heating time is recorded at the same time; the temperature data of the temperature acquisition system is read in real time through the DTS demodulator; after the heating time reaches the set time, the power supply, control switch and voltage regulator are turned off to stop the heating of the heating resistance wire, and the temperature data read by the DTS demodulator is saved. S3. Determine the target formation carbon dioxide saturation data based on the temperature data; In step S3, determining the target formation carbon dioxide saturation data based on the temperature data includes: Based on the temperature change Δ T logarithm of the heating set time ln t Linear relationship: Therefore, the thermal conductivity λ of the soil and rock medium is calculated, where t is the set heating time, and Δ is the thermal conductivity λ. T This represents the change in temperature data within a set heating time t. q This refers to the amount of heat transferred per unit length of heating resistance wire per unit time. λ Thermal conductivity of the soil and rock medium M It is a constant; Based on the thermal conductivity of the soil and rock medium λ With the water saturation in the rock mass S w The quantitative relationship was used to calculate and determine the water saturation in the rock mass. S w And the saturation level of carbon dioxide 1- S w .

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