Computation method and device for irreducible water saturation of tight sandstone reservoir, electronic equipment, storable medium and computer program product

Abstract

The invention relates to the technical field of oil and gas reservoir damage evaluation, in particular to a method and device for calculating irreducible water saturation of a tight sandstone reservoir, electronic equipment, a storable medium and a computer program product. The method comprises the following steps: acquiring a pore distribution curve of a compact sandstone sample; based on the pore distribution curve of the compact sandstone sample, determining the capillary bound water content of different pressure differences of the compact sandstone reservoir; carrying out total rock and clay mineral analysis on the compact sandstone sample to obtain the content of the clay bound water in the compact sandstone reservoir; and obtaining the irreducible water saturation of the tight sandstone reservoir based on the capillary irreducible water content and the clay irreducible water content. According to the method, the relationship between the absolute content, the pore distribution, the stress distribution and the interfacial tension of the clay mineral and the irreducible water saturation is established, so that qualitative and quantitative analysis on the irreducible water saturation is quickly and accurately performed.

Description

Technical Field

[0001] This invention relates to the field of oil and gas reservoir damage assessment technology, and in particular to a method, apparatus, electronic device, storage medium and computer program product for calculating the bound water saturation of tight sandstone reservoirs. Background Technology

[0002] Tight sandstone reservoirs often require fracturing due to their poor physical properties, narrow throats, and strong heterogeneity. As production and development progress, the production pressure differential increases, which can easily lead to engineering problems such as water production without gas production. The root cause is the lack of detailed reservoir evaluation, mainly due to unclear bound water saturation and unclear gas-water distribution and occurrence status.

[0003] Bound water saturation is crucial for evaluating oil and gas reserves, calculating reserves, and predicting production capacity in tight sandstone reservoirs. If the bound water saturation cannot be determined, it can lead to reduced production capacity or even water flooding of gas wells.

[0004] Centrifugation, nuclear magnetic resonance (NMR), mercury intrusion porosimetry (MIP), semi-permeable diaphragm method, and closed core saturation test are representative methods for measuring bound water saturation. Centrifugation requires precise centrifugation speed and equilibration time; otherwise, errors are significant. NMR results are greatly affected by the displacement method. Mercury intrusion porosimetry offers advantages such as speed, efficiency, and relatively low cost, but rock samples cannot be reused, and the measured fluid differs significantly from the actual formation conditions. The semi-permeable diaphragm method closely approximates the wetting conditions of actual oil reservoirs, but its measurement time is long and it cannot measure loose cores. The closed core saturation test offers high accuracy but is expensive, time-consuming, and yields limited data.

[0005] Bound water is typically found on the reservoir surface, in pore corners, and within microcapillaries, influenced by both capillary and viscous forces. Studies have found a positive correlation between bound water saturation and capillary forces, as well as the mass fraction of clay minerals (kaolinite, illite, montmorillonite, and the illite-montmorillonite interlayer). Since both capillary forces and clay mineral content can be measured under laboratory conditions, the method for calculating bound water saturation based on capillary curves and clay minerals offers advantages such as low cost, short processing time, and high accuracy. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a method, apparatus, electronic device, storage medium, and computer program product for calculating the bound water saturation of tight sandstone reservoirs. The invention provides the following technical solution:

[0007] In a first aspect of the invention, a method for calculating the bound water saturation of a tight sandstone reservoir is provided, the method comprising:

[0008] Obtain the pore distribution curve of the dense sandstone sample;

[0009] Based on the pore distribution curve of the tight sandstone sample, the capillary bound water content of the tight sandstone reservoir under different pressure differentials was determined.

[0010] Whole-rock and clay mineral analysis was performed on tight sandstone samples to obtain the clay-bound water content of tight sandstone reservoirs.

[0011] Based on the capillary bound water content and clay bound water content, the bound water saturation of the tight sandstone reservoir is obtained.

[0012] Preferably, methods for obtaining pore distribution curves of dense sandstone samples include: constant-rate mercury intrusion porosimetry, high-pressure mercury intrusion porosimetry, nuclear magnetic resonance (NMR) or NMR-mercury intrusion porosimetry.

[0013] Preferably, the capillary bound water content of the tight sandstone reservoir is determined based on the pore distribution curve of the tight sandstone sample, including:

[0014] Based on the pore distribution curve of the dense sandstone sample, the relationship between pore percentage and pore radius was determined.

[0015] By using the relationship between pore percentage and pore radius, the minimum pore radius can be obtained and the corresponding capillary pressure can be calculated.

[0016] Based on the minimum pore radius corresponding to capillary pressure, the capillary bound water content of tight sandstone reservoirs under different production pressure differentials is obtained.

[0017] Preferably, the formula for calculating the capillary pressure corresponding to the minimum pore radius is as follows:

[0018]

[0019] In the formula, r min σ1 and σ2 are the minimum pore radius; σ1 and σ2 are the surface tensions of the fluid; θ is the contact angle between the fluid and the sample; P c This refers to capillary pressure.

[0020] Preferably, the formula for calculating the capillary bound water content of the tight sandstone reservoir is as follows:

[0021]

[0022] Among them, S tw Capillary bound water content; V p It is total porosity; V i It represents the volume corresponding to different pore sizes.

[0023] Preferably, whole-rock and clay mineral analysis is performed on tight sandstone samples to obtain the clay-bound water content of the tight sandstone reservoir, including:

[0024] Whole-rock and clay mineral analysis was performed on dense sandstone samples to determine the absolute contents of illite, montmorillonite, chlorite and kaolinite clay minerals;

[0025] The absolute contents of illite, montmorillonite, chlorite and kaolinite clay minerals were calculated to obtain the clay-bound water content of the tight sandstone reservoir.

[0026] The preferred formula for calculating the clay-bound water content in tight sandstone reservoirs is:

[0027]

[0028] In the formula, 1. Clay bound water content; a. Montmorillonite water absorption coefficient; b. Illite water absorption coefficient; c. Chlorite water absorption coefficient; d. Kaolinite water absorption coefficient; M 蒙 This represents the absolute content of montmorillonite; M 伊 This refers to the absolute content of illite; M 绿 The absolute content of chlorite; M 高 This represents the absolute content of kaolinite; M 总 This represents the total mass of the sample.

[0029] Preferably, the formula for calculating the bound water saturation of the tight sandstone reservoir is:

[0030]

[0031] In the formula, S w The bound water content; The bound water content of clay; S tw This refers to the capillary bound water content.

[0032] In a second aspect of the invention, a device for calculating the bound water saturation of a tight sandstone reservoir is provided, the device comprising,

[0033] The first acquisition unit is used to acquire the pore distribution curve of the dense sandstone sample;

[0034] The determination unit is used to determine the capillary bound water content of the tight sandstone reservoir under different pressure differentials based on the pore distribution curve of the tight sandstone sample.

[0035] The second acquisition unit is used to perform whole-rock and clay mineral analysis on tight sandstone samples to obtain the clay bound water content of tight sandstone reservoirs.

[0036] The third acquisition unit is used to obtain the bound water saturation of tight sandstone reservoirs based on the capillary bound water content and the clay bound water content.

[0037] In a third aspect of the invention, an electronic device is provided, the electronic device comprising at least one processor and at least one memory, the memory being data-connected to the processor, wherein...

[0038] The memory stores instructions that can be executed by the at least one processor, which, when executed by the at least one processor, enables the at least one processor to perform the method described above.

[0039] In a fourth aspect of the invention, a computer-storeable medium is provided, characterized in that the storage medium stores computer instructions, which, when executed by a processor, specifically perform the steps in the method described above.

[0040] In a fifth aspect of the invention, a computer program product is provided, comprising computer instructions, characterized in that, when the computer instructions are executed by a processor, they specifically perform the steps in the method described above.

[0041] The technical effects and advantages of this invention are as follows:

[0042] Compared with existing methods, this method establishes the relationship between the absolute content of clay minerals, pore distribution, stress distribution, interfacial tension, and bound water saturation, enabling rapid and accurate qualitative and quantitative analysis of bound water saturation. This method offers the following advantages:

[0043] (1) A relationship was established between field evaluation parameters such as theoretical bound water saturation corresponding to on-site stress or pressure gradient. In previous studies, the qualitative relationship between clay minerals, physical properties and bound water saturation was discussed, but a quantitative relationship was not given;

[0044] (2) The calculation method based on clay-bound water and capillary-bound water provides a more objective evaluation of reservoir bound water saturation. Reservoir fluids can be divided into mobile fluids and immobile fluids, but capillary-bound water contains both. This patent innovatively distinguishes between them.

[0045] (3) This method can quickly and easily determine the saturation of bound water in the reservoir, and optimize or select the appropriate pressure fluid formulation to guide the fracturing operation procedure. Existing methods can complete the calculation using field logging data, which is more cost-effective than nuclear magnetic resonance.

[0046] This method can be used to evaluate the saturation of bound water in reservoirs, providing a data basis for predicting water-phase trap damage.

[0047] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0048] Figure 1 This is a flowchart of the method for calculating the bound water saturation of tight sandstone reservoirs provided in the embodiments of this application;

[0049] Figure 2 This is a diagram of a device for calculating the bound water saturation of tight sandstone reservoirs provided in an embodiment of this application;

[0050] Figure 3 This is a structural block diagram of an electronic device according to an embodiment of this application;

[0051] Figure 4 The embodiments of this application provide the reservoir bound water saturation corresponding to different mineral content ratios under different production pressure differentials and with a total clay mineral content of 5%.

[0052] Figure 5 The embodiments of this application provide the corresponding reservoir bound water saturation under different production pressure differentials and with a total clay mineral content of 10%;

[0053] Figure 6 The embodiments of this application provide the corresponding reservoir bound water saturation under different production pressure differentials and with a total clay mineral content of 15%;

[0054] Figure 7 The embodiments of this application provide the corresponding reservoir bound water saturation under different production pressure differentials and with a total clay mineral content of 20%;

[0055] Figure 8 For the embodiments of this application, under different production pressure differentials, with a total clay mineral content of 5%, the surface tension of fluid gas and water is 72 mN / m, and the contact angle of 30° corresponds to the reservoir bound water saturation.

[0056] Figure 9 For the embodiments of this application, under different production pressure differentials, with a total clay mineral content of 5%, the surface tension of fluid gas and water is 72 mN / m, and the contact angle of 60° corresponds to the reservoir bound water saturation.

[0057] Figure 10 For the embodiments of this application, under different production pressure differentials, with a total clay mineral content of 5%, the surface tension of fluid gas and water is 72 mN / m, and the contact angle of 90° corresponds to the reservoir bound water saturation.

[0058] Figure 11For the embodiments of this application, under different production pressure differentials, with a total clay mineral content of 5%, the fluid gas-water surface tension is 20 mN / m, and the contact angle of 30° corresponds to the reservoir bound water saturation.

[0059] Figure 12 For the embodiments of this application, under different production pressure differentials, with a total clay mineral content of 5%, the fluid gas-water surface tension is 20 mN / m, and the contact angle of 60° corresponds to the reservoir bound water saturation.

[0060] Figure 13 For the embodiments of this application, under different production pressure differentials, with a total clay mineral content of 5%, the surface tension of fluid gas and water is 20 mN / m, and the contact angle of 90° corresponds to the reservoir bound water saturation. Detailed Implementation

[0061] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0062] To address the shortcomings of existing technologies, this invention discloses a method for calculating the bound water saturation of tight sandstone reservoirs, such as... Figure 1 As shown, the method includes,

[0063] Step 1: Obtain the pore distribution curve of the dense sandstone sample;

[0064] Step 2: Based on the pore distribution curve of the tight sandstone sample, determine the capillary bound water content of the tight sandstone reservoir under different pressure differentials;

[0065] Step 3: Perform whole-rock and clay mineral analysis on the tight sandstone samples to obtain the clay-bound water content of the tight sandstone reservoir;

[0066] Step 4: Based on the capillary bound water content and clay bound water content, obtain the bound water saturation of the tight sandstone reservoir.

[0067] In a specific embodiment of the present invention, for step 1, obtaining the pore distribution curve of the dense sandstone sample includes: mercury intrusion porosimetry (constant rate and high pressure), nuclear magnetic resonance (NMR) or NMR-mercury intrusion porosimetry, to obtain the pore distribution curve of the dense sandstone sample. Preferably, the pore distribution curve is determined by high-pressure mercury intrusion porosimetry.

[0068] In a specific embodiment of the present invention, for step 2, determining the capillary bound water content of the tight sandstone reservoir based on the pore distribution curve of the tight sandstone sample includes:

[0069] Step 201: Based on the pore distribution curve of the dense sandstone sample, determine the relationship between the pore percentage and the pore radius;

[0070] Step 202: By using the relationship between porosity percentage and pore radius, obtain the minimum pore radius and calculate the corresponding capillary pressure. By using the relationship between mercury inlet pressure and pore size, and by using the pore size distribution, the capillary pressure of pores of different sizes can be calculated, thereby obtaining the minimum pore radius corresponding to the capillary pressure. Calculate the minimum pore radius that can overcome the capillary pressure using the following formula.

[0071]

[0072] In the formula, r min σ1 is the minimum pore radius, nm; σ1, σ2 is the surface tension of the fluid, mN / m; θ is the contact angle between the fluid and the sample, °; P c This is the capillary pressure, in MPa.

[0073] Step 203: Obtain the capillary bound water content of the tight sandstone reservoir based on the minimum pore radius corresponding to the capillary pressure. Specifically, the pore volume occupied by capillary bound water is calculated based on the minimum pore radius. The formula for calculating the capillary bound water content of the tight sandstone reservoir is as follows:

[0074]

[0075] Among them, S tw Capillary bound water content, %; V p It is the total porosity, m 3 V i It represents the volume corresponding to different pore sizes, in meters (m). 3 .

[0076] In a specific embodiment of the present invention, step 3, which involves performing whole-rock and clay mineral analysis on the tight sandstone sample to obtain the clay-bound water content of the tight sandstone reservoir, includes:

[0077] Step 301: Perform whole-rock and clay mineral analysis on the dense sandstone sample to determine the absolute contents of illite, montmorillonite, chlorite and kaolinite clay minerals;

[0078] Step 302: Calculate the absolute contents of the illite, montmorillonite, chlorite, and kaolinite clay minerals to obtain the clay-bound water content of the tight sandstone reservoir. The formula for calculating the clay-bound water content of the tight sandstone reservoir is as follows:

[0079]

[0080] In the formula, 1. Clay bound water content, %; a. Montmorillonite water absorption coefficient, dimensionless; b. Illite water absorption coefficient, dimensionless; c. Chlorite water absorption coefficient, dimensionless; d. Kaolinite water absorption coefficient, dimensionless; M_montmorillonite is the absolute content of montmorillonite, g; M_ilite is the absolute content of illite, g; M_chlorite is the absolute content of chlorite, g; M_kaolinite is the absolute content of kaolinite, g; M_total is the total mass of the sample, g.

[0081] In a specific embodiment of the present invention, for step 4, the clay-bound water and capillary-bound water are normalized to obtain the bound water saturation of the tight sandstone reservoir. The calculation formula is as follows:

[0082]

[0083] In the formula, S w The bound water content is expressed as a percentage. The bound water content of clay; S tw This refers to the capillary bound water content.

[0084] This method establishes a method for calculating bound water saturation based on capillary force curves and clay mineral content. By combining water saturation with actual operating conditions, it can calculate the reservoir's water cut and water content in real time, providing a reference for oil and gas field development.

[0085] This invention also provides a device for calculating the bound water saturation of tight sandstone reservoirs, such as... Figure 2 As shown, the device includes,

[0086] The first acquisition unit is used to acquire the pore distribution curve of the dense sandstone sample;

[0087] The determination unit is used to determine the capillary bound water content of the tight sandstone reservoir based on the pore distribution curve of the tight sandstone sample.

[0088] The second acquisition unit is used to perform whole-rock and clay mineral analysis on tight sandstone samples to obtain the clay bound water content of tight sandstone reservoirs.

[0089] The third acquisition unit is used to obtain the bound water saturation of tight sandstone reservoirs based on the capillary bound water content and the clay bound water content.

[0090] Regarding the apparatus in the above embodiments, the specific manner in which each unit performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0091] Based on the above disclosure, the present invention also provides an electronic device. For example... Figure 3 As shown, the electronic device of this disclosure includes at least one processor electrically connected to the present invention and at least one memory electrically connected to the processor, wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the method steps as executed by the controller above.

[0092] An embodiment of the present invention also provides a storable medium storing computer instructions, which, when executed by a processor, are specifically executed according to the steps in the method described in the above embodiment.

[0093] An embodiment of the present invention also provides a computer program product, including computer instructions, which, when executed by a processor, specifically follow the steps in the method described in the above embodiment.

[0094] The technical solution of the present invention will be further described below with reference to specific embodiments.

[0095] For a specific region, the method of this invention is used to determine the bound water saturation of tight sandstone reservoirs in that region. The specific steps are as follows:

[0096] Step 1: As shown in Table 1, the pore distribution curve of the dense sandstone sample was obtained by mercury intrusion porosimetry.

[0097] Step 2: Calculate the capillary pressure that can be overcome based on the pore size distribution and the following formula; as shown in Table 1, the capillary bound water content of the tight sandstone reservoir under different pressure differences, different gas-water surface tensions, and different contact angles is determined.

[0098]

[0099] In the formula, r min σ1 is the minimum pore radius, nm; σ1, σ2 is the surface tension of the fluid, mN / m; θ is the contact angle between the fluid and the sample, °; P c This is the capillary pressure, in MPa.

[0100] Table 1. Pore distribution and corresponding capillary force of sample 1

[0101]

[0102]

[0103] Step 3: As shown in Tables 2 and 3, whole-rock and clay mineral analysis was performed on the tight sandstone samples. The clay mineral content ranged from 5.3% to 17.8%, so the clay mineral content was calculated to be 5% to 20% in this case. Similarly, the proportion of clay mineral types was determined. And through empirical values, the water absorption coefficient of montmorillonite was taken as 18.9, the water absorption coefficient of illite was 6.5, and the water absorption coefficient of chlorite was 2. For example, as shown in Table 4, the clay-bound water content of tight sandstone reservoirs with a clay content of 5% and different clay proportions was calculated. Similarly, the clay-bound water content of tight sandstone reservoirs with a clay content of 10%, 15%, and 20% and different clay proportions was calculated.

[0104] Table 2. Results of X-ray diffraction analysis of whole-rock minerals.

[0105]

[0106] Table 3. Results of X-ray Diffraction Analysis of Clay Minerals

[0107]

[0108]

[0109] Table 4. Clay bound water content at different clay mineral contents (5%)

[0110]

[0111] Step 4: Based on the normalization of the capillary bound water content and clay bound water content, obtain the bound water saturation of the tight sandstone reservoir and plot it as a chart (e.g., Figure 4-13 ).

[0112] Combined with appendix Figure 4-7 The theoretical bound water saturation of any well in this block can be obtained. If there is no data on fluid properties of tight reservoirs in other blocks, the bound water saturation can also be estimated based on this chart, in conjunction with the attached... Figure 4-7 It can calculate the theoretical recoverable gas volume by obtaining the bound water saturation of different reservoirs under different production regimes, i.e., production pressure differentials. It can be used to guide the setting of production pressure differentials.

[0113] Combined with appendix Figure 8-13 The theoretical bound water saturation of the reservoir with 5% clay mineral content in this block can be obtained. If no clay mineral content data is available for tight reservoirs in other blocks, the clay mineral content can be estimated to establish relevant plots for calculating bound water saturation. (See attached...) Figure 4-7 It can calculate the theoretical recoverable gas volume by calculating the bound water saturation of different reservoirs with varying fluid properties. It can also be used to guide the optimization of fracturing fluids.

[0114] Compared with conventional methods such as well logging and laboratory experiments for obtaining bound water saturation, this method has advantages such as low cost, simplicity and speed, high accuracy, and compatibility with on-site construction parameters. It can be used for fracturing production in tight reservoirs.

[0115] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for calculating the bound water saturation of tight sandstone reservoirs, characterized in that, The method includes, Obtain the pore distribution curve of the dense sandstone sample; Based on the pore distribution curve of the tight sandstone sample, the capillary bound water content of the tight sandstone reservoir under different pressure differentials was determined. Whole-rock and clay mineral analysis was performed on tight sandstone samples to obtain the clay-bound water content of tight sandstone reservoirs. Based on the capillary bound water content and clay bound water content, the bound water saturation of the tight sandstone reservoir is obtained.

2. The method for calculating the bound water saturation of tight sandstone reservoirs according to claim 1, characterized in that, Methods for obtaining pore distribution curves of dense sandstone samples include: constant-rate mercury intrusion porosimetry, high-pressure mercury intrusion porosimetry, nuclear magnetic resonance (NMR) or NMR-mercury intrusion porosimetry.

3. The method for calculating the bound water saturation of tight sandstone reservoirs according to claim 1, characterized in that, Based on the pore distribution curve of the tight sandstone sample, the capillary bound water content of the tight sandstone reservoir is determined, including: Based on the pore distribution curve of the dense sandstone sample, the relationship between pore percentage and pore radius was determined. By using the relationship between pore percentage and pore radius, the minimum pore radius can be obtained and the corresponding capillary pressure can be calculated. Based on the minimum pore radius corresponding to capillary pressure, the capillary bound water content of tight sandstone reservoirs under different production pressure differentials is obtained.

4. The method for calculating the bound water saturation of tight sandstone reservoirs according to claim 3, characterized in that, The formula for calculating the capillary pressure corresponding to the minimum pore radius is as follows: In the formula, r min σ1 and σ2 are the minimum pore radius; σ1 and σ2 are the surface tensions of the fluid; θ is the contact angle between the fluid and the sample; P c This refers to capillary pressure.

5. The method for calculating the bound water saturation of tight sandstone reservoirs according to claim 3 or 4, characterized in that, The formula for calculating the capillary bound water content of the tight sandstone reservoir is as follows: Among them, S tw Capillary bound water content; V p It is total porosity; V i It represents the volume corresponding to different pore sizes.

6. The method for calculating the bound water saturation of tight sandstone reservoirs according to claim 1, characterized in that, Whole-rock and clay mineral analysis was performed on tight sandstone samples to obtain the clay-bound water content of the tight sandstone reservoir, including: Whole-rock and clay mineral analysis was performed on dense sandstone samples to determine the absolute contents of illite, montmorillonite, chlorite and kaolinite clay minerals; The absolute contents of illite, montmorillonite, chlorite and kaolinite clay minerals were calculated to obtain the clay-bound water content of the tight sandstone reservoir.

7. The method for calculating the bound water saturation of tight sandstone reservoirs according to claim 6, characterized in that, The formula for calculating the clay-bound water content in tight sandstone reservoirs is as follows: In the formula, 1. Clay bound water content; a. Montmorillonite water absorption coefficient; b. Illite water absorption coefficient; c. Chlorite water absorption coefficient; d. Kaolinite water absorption coefficient; M 蒙 This represents the absolute content of montmorillonite; M 伊 This refers to the absolute content of illite; M 绿 The absolute content of chlorite; M 高 This represents the absolute content of kaolinite; M 总 This represents the total mass of the sample.

8. The method for calculating the bound water saturation of tight sandstone reservoirs according to claim 1, characterized in that, The formula for calculating the bound water saturation of the tight sandstone reservoir is as follows: In the formula, S w The bound water content; S represents the bound water content of the clay. tw This refers to the capillary bound water content.

9. A device for calculating the bound water saturation of tight sandstone reservoirs, characterized in that, The device includes, The first acquisition unit is used to acquire the pore distribution curve of the dense sandstone sample; The determination unit is used to determine the capillary bound water content of the tight sandstone reservoir under different pressure differentials based on the pore distribution curve of the tight sandstone sample. The second acquisition unit is used to perform whole-rock and clay mineral analysis on tight sandstone samples to obtain the clay bound water content of tight sandstone reservoirs. The third acquisition unit is used to obtain the bound water saturation of tight sandstone reservoirs based on the capillary bound water content and the clay bound water content.

10. An electronic device comprising at least one processor and at least one memory, the memory being data-connected to the processor, wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-8.

11. A computer-storable medium, characterized in that, The storable medium stores computer instructions, which, when executed by a processor, specifically perform the steps of the method as described in any one of claims 1-8.

12. A computer program product comprising computer instructions, characterized in that, When the computer instructions are executed by the processor, they specifically perform the steps in the method as described in any one of claims 1-8.

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