Core fluid saturation quantitative analysis method and system based on iodide ion enhanced CT imaging
By using iodine ion solution to enhance contrast and constructing a linear equation of displacement in CT imaging, the problem of inaccurate determination of core fluid saturation is solved, and quantitative analysis and accurate evaluation of core fluid saturation is achieved, and the accuracy of reservoir management and oil and gas reservoir prediction is improved.
Patent Information
- Application Number
- CN202510394905.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2025-07-01
AI Technical Summary
The prior art is difficult to accurately determine core fluid saturation, especially in unconventional reservoir exploration, and conventional CT imaging techniques are difficult to distinguish between the saturation states of oil and water, resulting in inaccurate assessment of fluid saturation.
The core fluid saturation quantitative analysis method based on iodine ion enhanced CT imaging was adopted. By obtaining multiple core samples of the same specifications, CT imaging tests of saturated oil and saturated iodine ion solution were carried out to construct a linear equation of the displacement amount, the core samples were displaced using iodine ion solution, the actual measured value of the CT signal was recorded, and the displacement amount of the core samples was determined.
It significantly improves the accuracy and efficiency of core fluid saturation analysis, can more clearly identify the distribution of oil, gas, water and other fluids in the core, and supports more accurate reservoir management decisions and oil and gas reservoir recovery prediction.
Smart Images
Figure CN120232929A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of oil and gas exploration, and particularly to a method and system for quantitatively analyzing the fluid saturation of a core based on iodine ion enhanced CT imaging. Background Art
[0002] In the field of oil and gas exploration and development, the fluid saturation of a core is a key parameter for evaluating reservoir characteristics and predicting the recoverability of an oil and gas reservoir. The fluid saturation reflects the proportion of fluids such as oil, water, and gas in the pores of the core, and is crucial for the detailed description and characterization of the oil reservoir. However, accurately measuring the fluid saturation of a core poses technical challenges, especially in the exploration of unconventional reservoirs, where these challenges are more significant.
[0003] Computed tomography (CT) imaging technology, as a non-invasive detection method, provides an effective way to observe the internal structure of the core with its high-resolution imaging ability. In oil and gas exploration practice, the core may be in different saturation states, including fully saturated with oil, fully saturated with water, or an oil-water mixture state. Although CT imaging can clearly display the internal microstructure of the core, it has limitations in distinguishing oil and water in the core, and conventional CT imaging technology is difficult to distinguish these different saturation states. Since the density difference between oil and water is not obvious in CT imaging, this makes the accurate evaluation of fluid saturation complex. For example, a core fully saturated with oil may show a similar signal intensity to a core fully saturated with water in a CT image, and it is impossible to judge the fluid saturation based solely on the CT imaging result. In addition, the CT imaging signal intensity is affected by factors such as the density, composition, and imaging parameters of the core, and these factors may all interfere with the accurate evaluation of fluid saturation and affect the prediction effect of the recoverability of the oil and gas reservoir.
[0004] In view of the deficiencies of the prior art, the present invention proposes a method and system for quantitatively analyzing the fluid saturation of a core combined with iodine ion enhanced CT imaging, which can accurately measure the fluid saturation of the core and improve the accuracy and efficiency of the analysis of the fluid saturation of the core. Summary of the Invention
[0005] In view of this, the present invention provides a method and system for quantitatively analyzing the fluid saturation of a core based on iodine ion enhanced CT imaging to solve the technical problems of inaccurate evaluation of fluid saturation and inability to dynamically and quantitatively evaluate the displacement volume of a core sample at any stage during the determination of the fluid saturation of the existing core.
[0006] To achieve the above technical purpose, the present invention adopts the following technical solutions:
[0007] On the one hand, the present invention provides a method for quantitatively analyzing the fluid saturation of a core based on iodine ion enhanced CT imaging, including:
[0008] Obtain multiple core samples of the same specification from the target reservoir;
[0009] Perform oil saturation operation on the first core sample to ensure that the core pores are completely filled with oil, and record the oil saturation displacement volume;
[0010] Perform CT imaging test on the first core sample in the oil-saturated state to obtain the oil-saturated CT signal volume;
[0011] Perform iodine ion solution saturation operation on the second core sample to ensure that the core pores are completely filled with iodine ion solution, and record the iodine ion solution saturation displacement volume;
[0012] Perform CT imaging test on the second core sample in the iodine ion solution-saturated state to obtain the iodine ion solution-saturated CT signal volume;
[0013] Construct a displacement linear equation based on the oil saturation displacement volume, the oil-saturated CT signal volume, the iodine ion solution saturation displacement volume, and the iodine ion solution-saturated CT signal volume;
[0014] Use iodine ion solution to displace the third core sample in the oil-saturated state, perform CT test on the third core sample at the end of any stage of the displacement operation, and record the measured CT signal value at present;
[0015] Based on the displacement linear equation and the measured CT signal value, determine the displacement volume of the sample at the end of the stage.
[0016] Further, construct a displacement volume linear equation based on the oil saturation displacement volume, the oil-saturated CT signal volume, the iodine ion solution saturation displacement volume, and the iodine ion solution-saturated CT signal volume, including:
[0017] Establish coordinate axes with the displacement volume as the first coordinate and the CT signal volume as the second coordinate. Use a1 and a2 to represent the oil saturation displacement volume and the iodine ion solution saturation displacement volume respectively, and b1 and b2 to represent the oil-saturated CT signal volume and the iodine ion solution-saturated CT signal volume respectively;
[0018] Obtain the first coordinate point (a1, b1) based on the oil saturation displacement volume a1 and the oil-saturated CT signal volume b1;
[0019] Obtain the second coordinate point (a2, b2) based on the iodine ion solution saturation displacement volume a2 and the iodine ion solution-saturated CT signal volume b2;
[0020] According to the first coordinate point and the second coordinate point, the displacement linear equation Y = Ax + B is used to predict the CT signal volume of the core sample in different saturation states, or calculate the displacement volume of the core sample according to the known signal volume.
[0021] Further, based on the displacement volume linear equation and the measured CT signal values, determining the displacement volume of the sample at the end of the stage includes:
[0022] Substitute the measured CT signal values into the displacement volume linear equation to calculate the saturation ratio of the iodine ion solution in the third core sample after displacement.
[0023] Further, based on the displacement volume linear equation and the measured CT signal values, determining the displacement volume of the sample at the end of the stage further includes:
[0024] Perform multiple CT imaging tests on the third core sample, record the measured CT signal values of each CT imaging test, use the average value of the measured CT signal values as the input of the displacement volume linear equation, and calculate the saturation ratio of the iodine ion solution after displacement to reduce measurement errors.
[0025] Further, the core samples of the same specification are selected to reflect the mineral composition, pore structure, and fluid content characteristics of the target reservoir.
[0026] Further, the operation of saturating the first core sample with oil includes:
[0027] Dry the first core sample to make the sample in a state without oil and water;
[0028] Place the first core sample in oil under a preset experimental environment, and use a vacuum saturation device to remove the air in the pores to achieve complete oil saturation of the first core sample.
[0029] Further, the iodine ion solution uses a 3% potassium iodide solution.
[0030] Further, before the operation of saturating the second core sample with the iodine ion solution, it further includes:
[0031] Clean the second core sample to remove surface impurities and residues, and under a preset experimental environment, remove the air and moisture in the pores of the second core sample to ensure that the core is in a dry state without water and oil.
[0032] Further, the method further includes: when performing CT tests on the samples, adjusting the imaging parameters according to the CT imaging results, and the CT imaging parameter conditions of each core sample are the same;
[0033] The imaging parameters include voltage, current, and sample slice thickness.
[0034] On the other hand, the present invention also proposes a core fluid saturation quantitative analysis system based on iodine ion enhanced CT imaging for implementing the above technical solution, including: an analysis control device, and the analysis control device is connected to a CT imaging test device and a vacuum saturation device;
[0035] The CT imaging test device is used to perform CT imaging tests on core samples to obtain CT signal amounts;
[0036] The vacuum saturation device is used to remove air and moisture in the pores of the core sample, and in a preset pressure environment, fill the pores through the penetration of liquid until the sample is completely saturated;
[0037] The analysis and control device is used to set the environmental parameters of the vacuum saturation device according to the reservoir characteristics where the core sample is located, and obtain the CT signal amount value feedback by the CT imaging test device; it is also used to construct a displacement linear equation based on the CT signal amount value and calculate the displacement amount.
[0038] Compared with the prior art, the core fluid saturation quantitative analysis method and system based on iodine ion enhanced CT imaging proposed by the present invention have the following advantages:
[0039] 1) The present invention first proposes a method of using an iodine ion solution in CT imaging to enhance the contrast of core fluid saturation analysis. Through the high X-ray absorption characteristics of iodine ions, the CT signal of the aqueous phase in the core is significantly improved, making the oil-water interface clearer;
[0040] 2) By establishing a linear equation model, this method realizes the quantitative analysis of core fluid saturation. It improves the accuracy, efficiency and reliability of the analysis, can provide accurate quantitative results for the study of core fluid characteristics, support better reservoir management decisions, and can improve work efficiency and accuracy in engineering practice. BRIEF DESCRIPTION OF THE DRAWINGS
[0041] Figure 1 It is a schematic flow chart of the core fluid saturation quantitative analysis method based on iodine ion enhanced CT imaging provided by the present invention;
[0042] Figure 2 It is a schematic experimental implementation flow chart provided by the present invention;
[0043] Figure 3 It is a schematic structural diagram of the core fluid saturation quantitative analysis system based on iodine ion enhanced CT imaging provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0044] The following will specifically describe the preferred embodiments of the present invention in conjunction with the drawings. The drawings form a part of this application and are used together with the embodiments of the present invention to explain the principle of the present invention, and are not used to limit the scope of the present invention.
[0045] Embodiment 1
[0046] Please refer to Figure 1, this embodiment provides a quantitative analysis method for core fluid saturation based on iodine ion enhanced CT imaging, including:
[0047] Step S101: Obtain multiple core samples of the same specification from the target reservoir;
[0048] Step S102: Perform oil saturation operation on the first core sample to ensure that the core pores are completely filled with oil, and record the oil saturation displacement volume;
[0049] Step S103: Perform CT imaging test on the first core sample in the oil-saturated state to obtain the oil-saturated CT signal volume;
[0050] Step S104: Perform iodine ion solution saturation operation on the second core sample to ensure that the core pores are completely filled with iodine ion solution, and record the iodine ion solution saturation displacement volume;
[0051] Step S105: Perform CT imaging test on the second core sample in the iodine ion solution-saturated state to obtain the iodine ion solution-saturated CT signal volume;
[0052] Step S106: Construct a displacement linear equation based on the oil saturation displacement volume, the oil-saturated CT signal volume, the iodine ion solution saturation displacement volume, and the iodine ion solution-saturated CT signal volume;
[0053] Step S107: Displace the third core sample with iodine ion solution, perform a CT test on the third core sample after the end of any stage of the displacement operation, and record the measured value of the current CT signal;
[0054] Step S108: Based on the displacement linear equation and the measured CT signal value, determine the displacement volume of the sample at the end of the stage.
[0055] The quantitative analysis method for core fluid saturation based on iodine ion enhanced CT imaging proposed in this embodiment uses iodine ion solution as a contrast agent, which can improve the contrast of CT imaging, make the recognition of the distribution of oil, gas, water and other fluids in the core by CT imaging clearer, and thus improve the accuracy of saturation measurement. By constructing a displacement linear equation, quantitative analysis of fluid saturation in different core samples can be achieved, which is applicable to various types of core samples and can be adjusted according to specific reservoir characteristics, with good flexibility. Compared with traditional physical experiment methods, the method of this embodiment combines the linear equation of CT signal and displacement volume, can better integrate experimental data, facilitate subsequent data analysis and model establishment, and provide a more comprehensive perspective for the research of geological reservoirs.
[0056] As a preferred embodiment, in step S101, the core samples of the same specification are selected as core samples reflecting the mineral composition, pore structure and fluid content characteristics of the target reservoir.
[0057] The types and proportions of minerals in the core directly affect the physical and chemical properties of the reservoir, such as permeability, porosity, etc. The fluid content (such as the saturation of water, oil, and gas) in the core sample directly affects the development potential and production efficiency of the oil and gas reservoir. By selecting representative core samples, the actual fluid distribution of the target reservoir can be reflected. Representative core samples are selected from the oil and gas reservoir to ensure that the geological, physical, and fluid properties of the samples can comprehensively represent the target reservoir.
[0058] As a preferred embodiment, in step S102, the operation of saturating the first core sample with oil includes:
[0059] Dry the first core sample to make the sample in a state of being free of oil and water;
[0060] Under a preset experimental environment, place the first core sample in oil, and use a vacuum pressurization device to remove the air in the pores to achieve complete oil saturation of the first core sample.
[0061] Specifically, under laboratory conditions, thoroughly clean the core sample to remove surface impurities and residues. Subsequently, process the core sample in a vacuum and high-temperature environment to remove the air and moisture in the pores. This process takes at least 5 days or more to ensure that the core is in a dry state without oil and water, preparing for the subsequent saturation step. The temperature of the experimental environment is usually set within the range from normal temperature to reservoir temperature, generally between 40°C and 60°C. In some cases, the temperature may also be adjusted to a higher or lower range according to the reservoir temperature. The setting of the temperature helps to reduce the viscosity of the oil, facilitating the oil to more easily enter the pores of the core.
[0062] Put the cleaned core sample into a vacuum pressurization saturation device, adjust the corresponding setting parameters, such as temperature and pressure, etc., to simulate the underground oil saturation conditions. The vacuum state helps to remove the air and moisture in the core pores, while pressurization can effectively push the oil into the core pores. Usually, the vacuum pressure is set at -0.8 to -1.0 MPa, and the pressure in the pressurization stage is usually set at 1 - 5 MPa to simulate the actual pressure environment of the underground oil reservoir until the core pores are completely filled with oil. During this process, record the volume a1 of the displaced solution. The displacement volume a1 is the content of oil present in the core sample after the oil saturation is completed.
[0063] As a preferred embodiment, when performing CT testing on the sample, adjust the imaging parameters according to the CT imaging results, and the CT imaging parameter conditions for each core sample are the same;
[0064] The imaging parameters include voltage, current, and sample slice thickness.
[0065] Specifically, use a precision instrument CT imaging test to image the saturated oil core sample, and record the CT signal quantity b1 of the first sample after saturation with oil. During the imaging process, adjust the CT imaging parameters, such as voltage, current, slice thickness, etc., to obtain the best image quality. Ensure the consistency of the imaging parameters for comparison with subsequent data.
[0066] As a preferred embodiment, the iodide ion solution uses a 3% potassium iodide solution.
[0067] Specifically, under laboratory conditions, taking potassium iodide as an example, accurately prepare a potassium iodide solution with a mass fraction of 3% as the iodide ion solution to ensure the consistency of the solution concentration for easy experiment repetition and comparison. The preparation of the iodide ion solution needs to be carried out in a sterile and dust-free environment to avoid solution contamination. It should be noted that potassium iodide is only soluble in water and not in oil, so using a potassium iodide solution to displace the saturated oil sample will not affect the test results due to its own physical and chemical properties.
[0068] Here, it should be noted that, like the saturation with oil operation, before the operation of saturating the second core sample with the iodide ion solution, it also includes:
[0069] Clean the second core sample to remove surface impurities and residues. Under a preset experimental environment, remove the air and moisture in the pores of the second core sample to ensure that the core is in a dry state without water and oil.
[0070] By removing the moisture and air in the pores of the core sample, ensure that it is saturated in a dry state, so that the iodide ion solution can fully penetrate into the core pores, thereby obtaining accurate experimental data and avoiding experimental errors caused by impurity interference.
[0071] As a preferred embodiment, immerse the core sample in the potassium iodide solution, control the temperature and pressure of the solution until the core pores are completely filled with the potassium iodide solution. The saturation process is the same as the oil saturation method. During this process, record the displaced solution quantity a2 to ensure the accuracy of the potassium iodide saturation process.
[0072] Perform CT imaging on the core sample saturated with the potassium iodide solution and record the CT signal quantity b2. During the imaging process, adjust the CT imaging parameters again to ensure the same imaging conditions as those of the saturated oil core for signal quantity comparison.
[0073] Based on the test results of two groups of samples, namely saturated oil cores and cores saturated with potassium iodide solution, the values of the displacement amounts in the fully saturated state are obtained as a1 and a2 respectively; the measured CT signal amounts are b1 and b2 respectively, and two coordinate points (a1, b1) and (a2, b2) are determined. Let x represent the displacement amount of the core sample during the displacement process, and Y represent the signal amount obtained from CT imaging. A linear equation model is established through statistical analysis methods: Y = Ax + B. This model is used to predict the CT signal amount of the core under an unknown saturation state or the displacement amount of the core under a known CT signal amount, and can provide a theoretical basis for subsequent displacement tests.
[0074] As a preferred embodiment, based on the displacement amount linear equation and the measured CT signal values, determining the displacement amount of the sample at the end of the stage includes:
[0075] Substitute the measured CT signal value into the displacement amount linear equation to calculate the saturation ratio of the potassium iodide solution in the core after displacement.
[0076] Perform displacement on the saturated oil core sample with a 3% potassium iodide solution by mass fraction. After displacement reaches a certain degree, use a CT imaging system to record the CT signal amount b3 at this time. Substitute the signal amount b3 into the previously constructed linear equation: Y = Ax + B, and solve for the amount of potassium iodide solution displaced in the core at this time, so as to determine the saturation ratio of oil in the core. Through the above method, analysts can dynamically and quantitatively calculate the displacement amount at any time during the displacement process during the experiment, as long as the signal amount at a certain moment is measured by CT imaging.
[0077] In order to further reduce measurement errors and enhance the stability and reliability of data, in some embodiments, based on the displacement amount linear equation and the measured CT signal values, determining the displacement amount of the sample at the end of the stage further includes:
[0078] Perform multiple CT imaging tests on the third core sample, record the measured CT signal values of each CT imaging test, use the average value of the measured CT signal values as the input of the displacement amount linear equation, and calculate the saturation ratio of the potassium iodide solution after displacement to reduce measurement errors.
[0079] Improve the accuracy of core fluid property analysis by the method of taking the average of multiple measurements, and provide help for optimizing reservoir management and the oil and gas production process. It should be noted that when performing CT imaging tests on the third core sample, the selected CT imaging parameters are kept consistent with those of the first core sample and the second core sample.
[0080] Figure 2The implementation process of this method is shown in detail. In the actual experimental process, it has significant advantages such as process controllability, strong applicability, and low operation difficulty. Combining the linear equation of CT signal and displacement volume can better integrate experimental data, facilitate subsequent data analysis and model establishment, and provide a more comprehensive perspective for the research of geological reservoirs.
[0081] Example 2
[0082] As Figure 3 shown, this embodiment also provides a system 200 for implementing the above-mentioned quantitative analysis method of core fluid saturation based on iodine ion enhanced CT imaging, including: an analysis control device 201, which is connected to a CT imaging test device 202 and a vacuum saturation device 203;
[0083] The CT imaging test device 202 is used to perform CT imaging tests on core samples to obtain CT signal amounts;
[0084] The vacuum saturation device 203 is used to remove air and moisture in the pores of the core sample, and in a preset pressure environment, fill the pores through the penetration of liquid until the sample is completely saturated;
[0085] The analysis control device 201 is used to set the environmental parameters of the vacuum saturation device according to the reservoir characteristics where the core sample is located, and obtain the CT signal amount value feedback by the CT imaging test device; it is also used to construct a displacement linear equation based on the CT signal amount value and calculate the displacement volume.
[0086] As a specific embodiment, the vacuum saturation device specifically includes a saturation container, a vacuum pump, a liquid injection and reflux system, and a pressure control system. The saturation container is usually a closed transparent container for placing core samples, which can withstand low pressures to ensure an effective vacuum environment can be created. The vacuum pump is used to pump out the air in the container to provide a low-pressure environment. The liquid injection and reflux system is used to inject liquid (usually oil or other research liquids) into the vacuum chamber to complete the solution saturation operation of the core sample, and recover the excess liquid from the vacuum chamber for reuse or analysis. The pressure control system is used to monitor the pressure condition inside the vacuum chamber to ensure that the saturation process is carried out under the preset pressure.
[0087] The quantitative analysis method and system of core fluid saturation based on iodine ion enhanced CT imaging provided by the present invention first propose to use iodine ion solution in CT imaging to enhance the contrast of core fluid saturation analysis, improve the clarity and accuracy of imaging, and provide strong support for the accurate evaluation of the fluid distribution and saturation in the core; through establishing a linear equation model, the quantitative analysis of core fluid saturation is realized.
[0088] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.
Claims
1. A method for quantitative analysis of core fluid saturation based on iodine ion enhanced CT imaging, characterized in that: include: Obtain multiple core samples of the same specifications from the target reservoir; Saturate the first core sample with oil to ensure that the core pores are completely filled with oil and record the saturated oil displacement volume; Perform CT imaging test on the first core sample in the oil-saturated state to obtain the saturated oil CT signal amount; The second core sample is operated with a saturated iodine ion solution to ensure that the core pores are completely filled with the iodine ion solution, and the displacement volume of the saturated iodine ion solution is recorded; Perform CT imaging test on the second core sample in a saturated iodine ion solution state to obtain a CT signal amount of the saturated iodine ion solution; A displacement linear equation is constructed according to the displacement amount of saturated oil, the CT signal amount of saturated oil, the displacement amount of saturated iodine ion solution and the CT signal amount of saturated iodine ion solution; The third core sample in the oil-saturated state is displaced by using an iodine ion solution, and a CT test is performed on the third core sample after any stage of the displacing operation is completed, and the current measured value of the CT signal is recorded; The displacement amount of the sample at the end of the stage is determined based on the displacement amount linear equation and the measured value of the CT signal.
2. The method for quantitative analysis of core fluid saturation based on iodine ion enhanced CT imaging according to claim 1, characterized in that: A displacement linear equation is constructed based on the saturated oil displacement, the saturated oil CT signal, the saturated iodine ion solution displacement and the saturated iodine ion solution CT signal, including: The coordinate axis is established with the displacement amount as the first coordinate and the CT signal amount as the second coordinate, a1 and a2 represent the saturated oil displacement amount and the saturated iodine ion solution displacement amount, respectively, and b1 and b2 represent the saturated oil CT signal amount and the saturated iodine ion solution CT signal amount, respectively; The first coordinate point (a1, b1) is obtained based on the saturated oil displacement amount a1 and the saturated oil CT signal amount b1; A second coordinate point (a2, b2) is obtained based on the displacement amount a2 of the saturated iodine ion solution and the CT signal amount b2 of the saturated iodine ion solution; The displacement linear equation Y=Ax+B based on the first coordinate point and the second coordinate point is used to predict the CT signal amount of the core sample under different saturation states, or to calculate the displacement amount of the core sample based on the known signal amount.
3. The method for quantitative analysis of core fluid saturation based on iodine ion enhanced CT imaging according to claim 2, characterized in that: Based on the displacement linear equation and the measured value of the CT signal, determining the displacement of the sample at the end of the stage includes: The measured value of the CT signal was substituted into the displacement linear equation to calculate the saturation ratio of the iodine ion solution in the third core sample after displacement.
4. The method for quantitative analysis of core fluid saturation based on iodine ion enhanced CT imaging according to claim 3, characterized in that: Determining the displacement amount of the sample at the end of the stage based on the displacement amount linear equation and the measured value of the CT signal, further comprising: The third core sample is subjected to multiple CT imaging tests, and the measured value of the CT signal of each CT imaging test is recorded. The average value of the measured value of the CT signal is used as the input of the displacement linear equation to calculate the saturation ratio of the iodine ion solution after displacement to reduce the measurement error.
5. The method for quantitative analysis of core fluid saturation based on iodine ion enhanced CT imaging according to claim 1, characterized in that: The core samples of the same specification are selected from core samples that reflect the mineral composition, pore structure and fluid content characteristics of the target reservoir.
6. The method for quantitative analysis of core fluid saturation based on iodine ion enhanced CT imaging according to claim 1, characterized in that: The first core sample was saturated with oil, including: Drying the first core sample to make the sample oil-free and water-free; Under the preset experimental environment, the first core sample is placed in oil, and the air in the pores is removed by a vacuum saturation device to achieve complete oil saturation of the first core sample.
7. The method for quantitative analysis of core fluid saturation based on iodine ion enhanced CT imaging according to claim 1, characterized in that: The iodide ion solution is a 3% potassium iodide solution.
8. The method for quantitative analysis of core fluid saturation based on iodine ion enhanced CT imaging according to claim 1, characterized in that: Before the second core sample is subjected to the saturated iodine ion solution operation, the process also includes: The second core sample is cleaned to remove surface impurities and residues, and under the preset experimental environment, the air and moisture in the pores of the second core sample are removed to ensure that the core is in a water-free and oil-free dry state.
9. The method for quantitative analysis of core fluid saturation based on iodine ion enhanced CT imaging according to claim 1, characterized in that: Also includes: When the sample is tested by CT, the imaging parameters are adjusted according to the CT imaging results, and the CT imaging parameter conditions of each core sample are consistent; The imaging parameters include voltage, current and sample slice thickness.
10. A core fluid saturation quantitative analysis system based on iodine ion enhanced CT imaging according to claim 1, characterized in that: include: An analysis and control device connected to the CT imaging test device and the vacuum saturation device; The CT imaging test equipment is used to perform CT imaging test on the core sample to obtain CT signal quantity; The vacuum saturation equipment is used to remove air and moisture from the pores of the core sample and fill the pores by liquid penetration in a preset pressure environment until the sample is completely saturated; The analysis and control device is used to set the environmental parameters of the vacuum saturation device according to the reservoir characteristics of the core sample, and obtain the CT signal value fed back by the CT imaging test device; it is also used to construct a displacement linear equation and calculate the displacement amount according to the CT signal value.