Analysis Method and Device for Residual Gas in Carbonate Reservoirs

Abstract

The present invention provides a method for analyzing residual gas in carbonate reservoirs, which includes: setting the rotation speed and grinding time, and then putting a ball mill tank in a negative pressure state into a ball mill for grinding. Among them, the ball mill tank contains a rock sample to be analyzed and a preset solution with a first set value; measuring the volume of the gas in the ball mill tank after grinding, and performing natural gas component and isotope analysis to obtain the total mole fraction of all components; taking out the rock sample to be analyzed in the ball mill tank, drying, filtering, and weighing the mass of the rock residue with a diameter meeting the preset conditions; calculating the content of natural gas in the non-connected pores of the rock sample to be analyzed based on the volume of the gas in the ball mill tank after grinding, the total mole fraction of all components, and the mass of the rock residue. The present invention releases the natural gas in the non-connected pores and does not introduce chemical pollution, and can obtain important parameters such as the composition and carbon isotope composition of natural gas and the content of natural gas released per gram of rock.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas exploration, and in particular, to a method and device for analyzing residual gas in carbonate reservoirs. Background Art

[0002] Geochemical parameters such as the composition and isotope of natural gas are key parameters for identifying geological factors such as the maturity, genetic type, and source of natural gas. Existing technologies "Measuring Gas Content in Unconventional Reservoir Rocks", "A Method for Analyzing Distribution Characteristics of Residual Gas in Reservoirs", "A Method and Device for Determining Gas Content in Tight Reservoirs", and "A Method and Device for Determining Gas Content in Tight Reservoirs" mainly focus on reservoir rocks, but their main technical means are to restore the gas content that can be accommodated in the pores connected to the outside in the current reservoir through calculation or experiment. Moreover, existing natural gas composition and isotope analysis technologies also take the natural gas that can be accommodated in the pores connected to the outside in the current layer or the natural gas produced by drilling as the research object.

[0003] However, in addition to some pores connected to the outside in carbonate reservoirs, there are still some pores not connected to the outside, and natural gas may also be sealed in the above-mentioned non-connected pores. Compared with the connected pores, the natural gas in the above-mentioned non-connected pores is sealed from the outside, so it will not be released during the natural gas extraction process and can be preserved. However, existing technologies lack testing methods for geochemical parameters such as the gas composition, isotope, and relative content in the above-mentioned non-connected pores.

[0004] Therefore, the present invention provides a method and device for analyzing residual gas in carbonate reservoirs. Summary of the Invention

[0005] To solve the above problems, the present invention provides a method for analyzing residual gas in carbonate reservoirs, the method comprising the following steps:

[0006] Step 1: After setting the rotation speed and grinding time, place the ball mill tank in a negative pressure state into a ball mill for grinding, wherein the ball mill tank contains a rock sample to be analyzed and a preset solution with a first set value;

[0007] Step 2: Measure the volume of the gas in the ball mill tank after grinding, and perform natural gas component and isotope analysis to obtain the total mole fraction of all components;

[0008] Step 3: Take out the rock sample to be analyzed in the ball mill tank, dry and filter it, and weigh the mass of the rock residue with a diameter meeting the preset conditions;

[0009] Step 4: Calculate the content of natural gas in the non-connected pores of the rock sample to be analyzed based on the volume of the gas in the ball mill tank after grinding, the total molar fraction of all components, and the mass of the rock residue.

[0010] According to an embodiment of the present invention, in the step 1, the rock sample to be analyzed is obtained through the following steps:

[0011] Collect rock samples from carbonate rock reservoirs;

[0012] Coarsely crush the rock samples from carbonate rock reservoirs by physical means, and select the rocks with diameters within the first numerical range as the rock samples to be analyzed.

[0013] According to an embodiment of the present invention, the physical means includes but is not limited to knocking, cutting, and a rock crusher.

[0014] According to an embodiment of the present invention, the step 1 includes the following steps:

[0015] Put the rock sample to be analyzed into the ball mill tank, and inject the preset solution with a first set value into the ball mill tank;

[0016] Seal the inlet and outlet at both ends of the top cover of the ball mill tank, install the top cover of the ball mill tank on the ball mill tank, and seal the ball mill tank;

[0017] Extract the gas in the ball mill tank through the outlet of the ball mill tank to make the ball mill tank in a negative pressure state.

[0018] According to an embodiment of the present invention, the step 2 includes the following steps:

[0019] Push a first piston container with a capacity of a second set value for gas extraction to the bottom and insert it into the outlet of the top cover of the ball mill tank;

[0020] Take a second piston container with a capacity of the second set value, insert it into the inlet of the top cover of the ball mill tank, and fill the second piston container with the preset solution;

[0021] Slowly inject the preset solution in the second piston container into the ball mill tank until the first piston container sucks in a preset solution value of a third set value, so that the gas in the ball mill tank enters the first piston container and the bottom of the first piston container is isolated from the air by the preset solution;

[0022] Record the volume of the gas in the first piston container as the volume of the gas in the ball mill tank after grinding, pull out the first piston container, and transfer the gas in the first piston container to a preset solution sample bottle for numbering and waiting for measurement.

[0023] According to an embodiment of the present invention, the second set value is greater than the remaining volume of the ball mill tank after injecting the preset solution of the first set value.

[0024] According to an embodiment of the present invention, in the second step, the following steps are included:

[0025] Perform gas chromatography analysis and isotope mass spectrometry analysis on the gas in the collected ball mill tank respectively to obtain the molar fractions of each component;

[0026] Based on the molar fractions of each component, calculate the total molar fraction of all components.

[0027] According to an embodiment of the present invention, in the third step, the following steps are included:

[0028] After the grinding is completed, open the top cover of the ball mill tank, collect the ground rock residue for drying, filter the rock residue with a sieve, and weigh the mass of the rock residue with a diameter meeting the preset conditions.

[0029] According to an embodiment of the present invention, in the fourth step, the content of natural gas in the non-connected pores of the rock sample to be analyzed is calculated according to the following formula:

[0030] c = n * v / ((m 0 - m) * 22.4 * 10 3 )

[0031] Wherein, c represents the content of natural gas in the non-connected pores of the rock sample to be analyzed, n represents the total molar fraction of all components, v represents the volume of the gas in the ball mill tank after grinding, m 0 represents the initial mass of the rock sample to be analyzed before grinding, and m represents the mass of the rock residue.

[0032] According to another aspect of the present invention, there is also provided an analysis device for residual gas in carbonate rock reservoirs. The device analyzes the residual gas in carbonate rock reservoirs by the method described in any one of the above, and the device includes:

[0033] A grinding module, which is used to set the rotation speed and grinding time and then put the ball mill tank in a negative pressure state into the ball mill for grinding. Among them, the ball mill tank contains the rock sample to be analyzed and the preset solution of the first set value;

[0034] A component module, which is used to measure the volume of the gas in the ball mill tank after grinding and perform natural gas component and isotope analysis to obtain the total molar fraction of all components;

[0035] A weighing module, which is used to take out the rock sample to be analyzed in the ball mill tank, dry and filter it, and weigh the mass of the rock residue with a diameter meeting the preset conditions;

[0036] A calculation module, which is used to calculate the content of natural gas in the disconnected pores of the rock sample to be analyzed based on the volume of the gas in the ball milling tank after grinding, the total molar fraction of all components, and the mass of the rock residue.

[0037] The analysis method and device for residual gas in carbonate rock reservoirs provided by the present invention physically break the carbonate rock reservoir sample to 100 mesh and below, effectively releasing the natural gas in the disconnected pores without introducing chemical pollution; maintaining a negative pressure environment for the sample during the crushing process, effectively preventing the released natural gas from dissipating to the outside; discharging all the gas in the sample container by injecting a preset solution, realizing the efficient collection of natural gas; analyzing the components and isotopes of the collected natural gas can obtain important parameters such as the composition and carbon isotope composition of natural gas, and at the same time, combining the mass of the carbonate rock crushed to below 100 mesh, the content of natural gas released per gram of rock can be obtained.

[0038] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures specifically pointed out in the specification, claims, and drawings. Description of the Drawings

[0039] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0040] Figure 1 Shows a flowchart of an analysis method for residual gas in carbonate rock reservoirs according to an embodiment of the present invention;

[0041] Figure 2 Shows a flowchart of a method for obtaining a ball milling tank in a negative pressure state according to an embodiment of the present invention;

[0042] Figure 3 Shows a flowchart of a method for obtaining the total molar fraction of all components according to an embodiment of the present invention;

[0043] Figure 4 Shows a schematic structural diagram of a ball milling tank according to an embodiment of the present invention; and

[0044] Figure 5 Shows a block diagram of the structure of an analysis device for residual gas in carbonate rock reservoirs according to an embodiment of the present invention. Detailed Embodiments

[0045] To make the objectives, technical solutions, and advantages of the present invention more clear, the following further details the embodiments of the present invention with reference to the accompanying drawings.

[0046] The present invention takes the natural gas preserved in the non-connected pores of carbonate reservoir samples as the analysis object, releases the residual natural gas in the non-connected pores through physical means, and collects and analyzes the above natural gas. The present invention can be used for the determination of the composition, isotope, and relative content of the residual natural gas in carbonate reservoirs.

[0047] Figure 1 Shows a flowchart of an analysis method for residual gas in carbonate reservoirs according to an embodiment of the present invention.

[0048] As Figure 1 shown, in step S101, after setting the rotation speed and grinding time, the ball milling tank in a negative pressure state is placed in a ball mill for grinding, where the ball milling tank contains the rock sample to be analyzed and a preset solution with a first set value. Specifically, the ball milling tank in a negative pressure state is placed in the ball mill, the rotation speed is set to 500 revolutions per minute, and grinding is carried out for 10 minutes.

[0049] In one embodiment, the rock sample to be analyzed and the ball milling tank in a negative pressure state are obtained by the method as Figure 2 shown. Specifically:

[0050] As Figure 2 shown, in step S201, a rock sample of a carbonate reservoir is collected. In one embodiment, 50 - 100 g of the rock sample of the carbonate reservoir to be analyzed is collected.

[0051] As Figure 2 shown, in step S202, the rock sample of the carbonate reservoir is coarsely crushed by physical means, and the rock with a diameter within the first numerical range is selected as the rock sample to be analyzed. In one embodiment, the physical means includes but is not limited to knocking, cutting, and a rock crusher. Specifically, the collected rock sample of the carbonate reservoir is coarsely crushed by physical means (such as knocking, cutting, rock crusher, etc.), and 20 g of the rock sample to be analyzed with a diameter of 0.5 - 2 cm is selected from it.

[0052] As Figure 2 shown, in step S203, the rock sample to be analyzed is placed in the ball milling tank, and a preset solution with a first set value is injected into the ball milling tank. Specifically, 20 g of the rock sample to be analyzed is placed in the ball milling tank, and then the preset solution is injected into the ball milling tank until the remaining space in the ball milling tank is 10 ml. Here, the total volume of the ball milling tank used is 100 ml, and the first preset value is 90 ml. In one embodiment, the preset solution is saturated brine.

[0053] AsFigure 2 As shown in the figure, in step S204, the inlets and outlets provided at both ends of the top cover of the ball mill tank are sealed, the top cover of the ball mill tank is installed on the ball mill tank, and the ball mill tank is sealed. Specifically, an inlet and an outlet are respectively provided on the left and right sides of the top cover of the ball mill tank, and both are sealed by using a rubber gasket and a nut containing pinholes. The top cover of the ball mill tank is inserted into the ball mill tank, the nut containing pinholes is tightened to seal the inlet and the outlet, and then the top cover of the ball mill tank is installed on the ball mill tank and the sealing screws are tightened.

[0054] As Figure 2 shown, in step S205, the gas in the ball mill tank is extracted through the outlet of the ball mill tank, so that the ball mill tank is in a negative pressure state. Specifically, a syringe with a capacity greater than 3 ml is taken, the syringe is inserted into the outlet of the top cover, and 3 ml of air in the ball mill tank is extracted to make the ball mill tank in a negative pressure.

[0055] As Figure 1 shown, in step S102, the volume of the gas in the ball mill tank after grinding is measured, and the natural gas components and isotopes are analyzed to obtain the total mole fraction of all components.

[0056] In one embodiment, the volume of the gas in the ball mill tank after grinding and the total mole fraction of all components are obtained by the method as Figure 3 shown. Specifically:

[0057] As Figure 3 shown, in step S301, a first piston container with a capacity of a second set value for gas sampling is pushed to the bottom and inserted into the outlet of the top cover of the ball mill tank.

[0058] As Figure 3 shown, in step S302, a second piston container with a capacity of a second set value is taken and inserted into the inlet of the top cover of the ball mill tank, and the second piston container is filled with a preset solution. In one embodiment, the first piston container and the second piston container are syringes.

[0059] As Figure 3 shown, in step S303, the preset solution in the second piston container is slowly injected into the ball mill tank until the first piston container sucks in a preset solution value of a third set value, so that the gas in the ball mill tank enters the first piston container and the bottom of the first piston container is isolated from the air by the preset solution.

[0060] As Figure 3 shown, in step S304, the volume of the gas in the first piston container is recorded as the volume v (unit: ml) of the gas in the ball mill tank after grinding, the first piston container is pulled out, and the gas in the first piston container is transferred to a preset solution sample bottle for numbering and waiting for measurement.

[0061] In one embodiment, the second set value is greater than the remaining volume of the ball milling tank after injecting the preset solution of the first set value. The total volume of the ball milling tank is 100 ml, the first set value is 90 ml, the second set value is 20 ml, and the third set value is 5 ml.

[0062] For example, the remaining volume of the ball milling tank is 10 ml. Take a syringe (S1) with a capacity of the second set value (20 ml) and fill it with the preset solution, that is, there is 20 ml of the preset solution in syringe S1. Then insert syringe S1 into the inlet of the top cover of the ball milling tank and slowly inject it into the ball milling tank until it reaches about 10 ml (it can only be said to be about 10 ml here, because the remaining volume of the ball milling tank may increase after the rock is broken). At this time, all the gas in it will be discharged. When using syringe S1 to continue injecting the preset solution, the preset solution will enter the gas sampling piston at the outlet. When the gas sampling piston at the outlet sucks in the preset solution of the third set value (i.e., 5 ml), stop injecting. At this time, there is still about 5 ml of the preset solution remaining in syringe S1. Therefore, the same syringe S1 is used to inject the preset solution of the third set value and to discharge the gas in the ball milling tank.

[0063] As Figure 3 shown, in step S305, the gas in the collected ball milling tank is respectively subjected to gas chromatography analysis and isotope mass spectrometry analysis to obtain the mole fractions of each component.

[0064] As Figure 3 shown, in step S306, based on the mole fractions of each component, the total mole fraction of all components is obtained.

[0065] Specifically, the gas in the collected ball milling tank is subjected to natural gas component and isotope analysis. Based on the mole fraction data of each component in the natural gas component analysis result, the total mole fraction n (unit: mol / mol) of all components is obtained.

[0066] As Figure 1 , in step S103, the rock sample to be analyzed in the ball milling tank is taken out, dried, filtered, and the mass of the rock residue with a diameter meeting the preset conditions is weighed.

[0067] Specifically, after the grinding is completed, open the top cover of the ball milling tank, collect the ground rock residue for drying, filter the rock residue with a sieve, and weigh the mass m (unit: g) of the rock residue with a diameter meeting the preset conditions. In one embodiment, a 100-mesh sieve is used, and the rock residue with a diameter meeting the preset conditions is the rock residue with a diameter greater than 100 mesh.

[0068] As Figure 1, in step S104, the content of natural gas in the non-connected pores of the rock sample to be analyzed is calculated based on the volume of the gas in the ball mill tank after grinding, the total molar fraction of all components, and the mass of the rock residue.

[0069] In one embodiment, the content of natural gas in the non-connected pores of the rock sample to be analyzed is calculated according to the following formula:

[0070] c = n * v / ((m 0 - m) * 22.4 * 10 3 )

[0071] where c represents the content of natural gas in the non-connected pores of the rock sample to be analyzed, n represents the total molar fraction of all components, v represents the volume of the gas in the ball mill tank after grinding, m 0 represents the initial mass of the rock sample to be analyzed before grinding, and m represents the mass of the rock residue.

[0072] Figure 4 shows a schematic structural diagram of a ball mill tank according to an embodiment of the present invention.

[0073] As Figure 4 shown, label 1 represents the nut for fixing the ball mill tank, label 2 represents the nut with a pinhole, label 3 represents the top cover of the ball mill tank, label 4 represents the preset solution, label 5 represents the ball mill tank, label 6 represents the piston container with the preset solution at the inlet, label 7 represents the piston container for gas extraction at the outlet, label 8 represents the preset solution, label 9 represents the rock sample to be analyzed, label 10 represents the sample-breaking ball, label 11 represents the rock residue after being broken by the ball mill, and label 12 represents the rubber gasket.

[0074] In one embodiment, a carbonate rock core sample from a certain well in the Tarim Basin is selected and the following steps are carried out for experimental analysis:

[0075] (1) Select 100 grams of massive rock core sample;

[0076] (2) Coarsely crush it using a sample crusher, select rock samples with a diameter of 0.5 - 2 cm from it, and then weigh 20 grams of the sample with a balance, m 0 = 20 g;

[0077] (3) Select a ball mill tank with a volume of 100 ml, put 20 grams of the sample and 2 sample-breaking balls into the ball mill tank, and then inject saturated brine into it to the 90 ml scale line of the ball mill tank;

[0078] (4) Set an inlet and an outlet on both sides of the top cover of the ball mill tank, and seal them both by using a gasket plus a nut with a pinhole;

[0079] (5) Install the top cover of the ball milling tank into the ball milling tank, tighten the nut to seal the inlet and outlet, then install the top cover of the ball milling tank on the ball milling tank and tighten the sealing screws;

[0080] (6) Take a syringe with a capacity of 10 ml, insert the syringe into the outlet of the top cover, and draw out 3 ml of air from the ball milling tank to make the ball milling tank in negative pressure;

[0081] (7) Place the ball milling tank in the ball mill, set the rotation speed to 500 revolutions per minute, and grind for 10 minutes;

[0082] (8) Take out the ball milling tank, push the piston of a 20-ml syringe to the low end, and then insert it into the outlet of the top cover of the ball milling tank;

[0083] (9) Take another 20-ml syringe filled with saturated saline solution, insert it into the inlet of the top cover, and slowly inject the saturated saline solution into the ball milling tank to make the gas in the ball milling tank enter the syringe at the outlet. After all the gas in the ball milling tank is discharged, continue to inject about 5 ml of saturated saline solution at the inlet to make about 5 ml of saturated saline solution be inhaled into the syringe at the outlet;

[0084] (10) Record the volume of the gas in the outlet syringe v = 7 ml;

[0085] (11) Pull out the outlet syringe, transfer the gas in it to the saturated saline sample bottle, and number it for testing;

[0086] (12) Open the top cover of the ball milling tank, collect the ground rock residue, and dry it;

[0087] (13) Filter the rock residue with a 100-mesh sieve and weigh the mass of the rock residue with a diameter greater than 100 mesh m = 7.1 g;

[0088] (14) Conduct gas chromatography and isotope mass spectrometry analysis on the collected gas respectively, and obtain the mole fractions of each component in the natural gas as n CH4 = 0.10245 mol / mol and n C2H6 = 3.1×10 -5 mol / mol and the C isotope value of methane is -40.7‰;

[0089] (15) According to the mole fraction data of each component in the natural gas component analysis results, calculate the total mole fraction of all components n = n CH4 + n C2H6 = 0.10276 (unit: mol / mol);

[0090] (16) Then according to the formula: c = n * v / ((m 0 - m) * 22.4 * 10 3)The content c of natural gas in the non-connected pores in the rock is obtained as 2.49×10 -6 (unit: mol / g rock).

[0091] Figure 5 The structural block diagram of the analysis device for residual gas in carbonate rock reservoirs according to an embodiment of the present invention is shown.

[0092] The analysis device 500 analyzes the residual gas in carbonate rock reservoirs by the method described in any one of the above. The analysis device 500 includes: a grinding module 501, a component module 502, a weighing module 503, and a calculation module 504.

[0093] The grinding module 501 is used to set the rotation speed and grinding time, and then put the ball mill tank in a negative pressure state into the ball mill for grinding. Among them, the ball mill tank contains the rock sample to be analyzed and a preset solution with a first set value.

[0094] The component module 502 is used to measure the volume of the gas in the ball mill tank after grinding, and perform natural gas component and isotope analysis to obtain the total mole fraction of all components.

[0095] The weighing module 503 is used to take out the rock sample to be analyzed in the ball mill tank, dry and filter it, and then weigh the mass of the rock residue with a diameter meeting the preset conditions.

[0096] The calculation module 504 is used to calculate the content of natural gas in the non-connected pores of the rock sample to be analyzed based on the volume of the gas in the ball mill tank after grinding, the total mole fraction of all components, and the mass of the rock residue.

[0097] In summary, the analysis method and device for residual gas in carbonate rock reservoirs provided by the present invention physically break the carbonate rock reservoir sample to 100 mesh and below, effectively release the natural gas in the non-connected pores and do not introduce chemical pollution; keep the sample in a negative pressure environment during the crushing process, effectively avoiding the loss of the released natural gas to the outside; adopt the method of injecting a preset solution to discharge all the gas in the sample container, realizing the efficient collection of natural gas; perform natural gas component and isotope analysis on the collected natural gas, and important parameters such as the composition and carbon isotope composition of natural gas can be obtained. At the same time, combined with the mass of the carbonate rock crushed to below 100 mesh, the content of natural gas released per gram of rock can be obtained.

[0098] It should be understood that the embodiments disclosed by the present invention are not limited to the specific structures, processing steps or materials disclosed herein, but should extend to equivalent alternatives of these features understood by those of ordinary skill in the relevant fields. It should also be understood that the terms used herein are only for the purpose of describing specific embodiments and do not mean to limit.

[0099] As used herein, the phrase "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrase "one embodiment" or "an embodiment" throughout the specification are not necessarily all referring to the same embodiment.

[0100] Although the embodiments disclosed in the present invention are as described above, the content described is only an embodiment adopted for the convenience of understanding the present invention and is not intended to limit the present invention. Any person skilled in the art within the technical field to which the present invention pertains may make any modifications and variations in the form and details of the implementation without departing from the spirit and scope disclosed by the present invention. However, the scope of patent protection of the present invention shall still be subject to the scope defined by the appended claims.

Claims

1. A method for analyzing residual gas in carbonate reservoirs, characterized in that, the method comprises the following steps: Step 1: After setting the rotation speed and grinding time, place the ball mill tank in a negative pressure state into the ball mill for grinding. Among them, the ball mill tank contains the rock sample to be analyzed and a preset solution with a first set value; Step 2: Measure the volume of the gas in the ball mill tank after grinding, and conduct natural gas component and isotope analysis to obtain the total molar fraction of all components; Step 3: Take out the rock sample to be analyzed in the ball mill tank, dry and filter it, and weigh the mass of the rock residue with a diameter meeting the preset conditions; Step 4: Calculate the content of natural gas in the non-connected pores of the rock sample to be analyzed based on the volume of the gas in the ball mill tank after grinding, the total molar fraction of all components, and the mass of the rock residue; In the said Step 2, it comprises the following steps: Push a first piston container with a capacity of a second set value for gas sampling to the bottom end and insert it into the outlet of the ball mill tank top cover; Take a second piston container with a capacity of the second set value and insert it into the inlet of the ball mill tank top cover. The second piston container is filled with the preset solution; Slowly inject the preset solution in the second piston container into the ball mill tank until the first piston container sucks in a preset solution value of a third set value, so that the gas in the ball mill tank enters the first piston container and the bottom of the first piston container is isolated from the air by the preset solution; Record the volume of the gas in the first piston container as the volume of the gas in the ball mill tank after grinding, pull out the first piston container, transfer the gas in the first piston container to a preset solution sample bottle, and number it for testing.

2. The method for analyzing residual gas in carbonate reservoirs according to claim 1, characterized in that, in the said Step 1, the rock sample to be analyzed is obtained through the following steps: Collect rock samples from carbonate reservoirs; Coarsely crush the rock samples of carbonate reservoirs by physical means, and select the rocks with diameters within the first numerical range as the rock samples to be analyzed.

3. The method for analyzing residual gas in carbonate reservoirs according to claim 2, characterized in that, the said physical means includes but is not limited to knocking, cutting, and crushers.

4. The method for analyzing residual gas in carbonate reservoirs according to claim 1, characterized in that, in the said Step 1, it comprises the following steps: Put the rock sample to be analyzed into the ball mill tank, and inject the preset solution with a first set value into the ball mill tank; Seal the inlet and outlet at both ends of the ball mill tank top cover, install the ball mill tank top cover on the ball mill tank, and seal the ball mill tank; Extract the gas in the ball mill tank through the outlet of the ball mill tank to make the ball mill tank in a negative pressure state.

5. The method for analyzing residual gas in carbonate reservoirs according to claim 1, characterized in that, the said second set value is greater than the remaining volume of the ball mill tank after injecting the preset solution with a first set value.

6. The method for analyzing residual gas in carbonate reservoirs according to claim 1, characterized in that, in the said Step 2, it comprises the following steps: The gas in the ball mill tank collected is respectively subjected to gas chromatography analysis and isotope mass spectrometry analysis to obtain the molar fractions of each component; Based on the molar fractions of each component, the total molar fraction of all components is obtained.

7. The analysis method for residual gas in carbonate rock reservoirs according to claim 1, characterized in that, in the third step, the following steps are included: After the grinding is completed, open the top cover of the ball mill tank, collect the ground rock residue for drying, filter the rock residue with a sieve, and weigh the mass of the rock residue with a diameter meeting the preset conditions.

8. The analysis method for residual gas in carbonate rock reservoirs according to claim 1, characterized in that, in the fourth step, the content of natural gas in the non-connected pores of the rock sample to be analyzed is calculated according to the following formula: c = n * v / ((m 0 - m) * 22.4 * 10 3 ) Among them, c represents the content of natural gas in the non-connected pores of the rock sample to be analyzed, n represents the total molar fraction of all components, v represents the volume of the gas in the ball mill tank after grinding, m 0 represents the initial mass of the rock sample to be analyzed before grinding, and m represents the mass of the rock residue.

9. An analysis device for residual gas in carbonate rock reservoirs, characterized in that, the device analyzes the residual gas in carbonate rock reservoirs by the method according to any one of claims 1-8, and the device includes: A grinding module, which is used to set the rotation speed and grinding time and then put the ball mill tank in a negative pressure state into a ball mill for grinding. Among them, the ball mill tank contains the rock sample to be analyzed and a preset solution with a first set value; A component module, which is used to measure the volume of the gas in the ball mill tank after grinding and conduct natural gas component and isotope analysis to obtain the total molar fraction of all components; A weighing module, which is used to take out the rock sample to be analyzed in the ball mill tank, dry and filter it, and weigh the mass of the rock residue with a diameter meeting the preset conditions; A calculation module, which is used to calculate the content of natural gas in the non-connected pores of the rock sample to be analyzed based on the volume of the gas in the ball mill tank after grinding, the total molar fraction of all components, and the mass of the rock residue.

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