Device and method for measuring porosity of low-permeability reservoir rock sample

Abstract

The invention discloses a device and method for measuring the porosity of a low-permeability reservoir rock sample, and relates to the field of low-permeability reservoir porosity measurement, and the device comprises a first equipment assembly, a second equipment assembly, a third equipment assembly and a vacuum pump; the first equipment assembly comprises a first box body, a first control valve and gas pressure detection equipment; the first box body is respectively communicated with the gas pressure detection equipment and the first control valve; the second equipment assembly comprises a second box body and a second control valve; the first control valve is communicated with the second box body; the second box body is communicated with the second control valve; the second control valve communicates with the vacuum pump; the third equipment assembly comprises a third control valve and high-pressure gas filling equipment; the high-pressure gas filling equipment is communicated with the third control valve; and the third control valve is communicated with the first box body. According to the device, the porosity of the rock sample can be measured in a manner of filling high-pressure gas into the pores of the rock sample, and the measurement precision of the porosity of the rock sample can be effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of low-permeability reservoir porosity measurement, and in particular to a device and method for measuring the porosity of a low-permeability reservoir rock sample. Background Art

[0002] With the massive consumption of conventional energy, unconventional energy has gradually become the focus of energy utilization. As an unconventional energy, tight oil and gas are widely distributed in low-permeability reservoirs and have very rich reserves, which are of great significance for alleviating energy shortages, ensuring energy security and economic construction.

[0003] At present, the development of tight oil and gas is in its infancy, with low awareness and incomplete theories. Porosity, as one of the basic physical parameters of low-permeability reservoirs, is the basis for evaluating tight oil and gas development and has guiding significance for the calculation of tight oil and gas reserves and the evaluation of low-permeability reservoir performance.

[0004] Low-permeability reservoirs are different from conventional reservoirs. They have pore characteristics such as diverse pore types, narrow pore throats, and multiple micro-nano pores. Based on the pore characteristics of low-permeability reservoirs, high-pressure mercury injection and weighing methods are currently mostly used to characterize the porosity of low-permeability reservoirs. However, due to the non-wettability of the liquid phase fluid, the liquid phase fluid cannot completely fill the pore space, resulting in large errors in the porosity measurement results of the permeable reservoir, making it difficult to measure accurately. Summary of the invention

[0005] The purpose of the present application is to provide a device and method for measuring the porosity of a low-permeability reservoir rock sample, which can improve the accuracy of the porosity measurement of the low-permeability reservoir.

[0006] To achieve the above objectives, this application provides the following solutions:

[0007] In a first aspect, the present application provides a device for measuring the porosity of a low-permeability reservoir rock sample, the device comprising a first device component, a second device component, a third device component and a vacuum pump; wherein:

[0008] The first equipment component includes a first box, a first control valve and a gas pressure detection device; the first box is communicated with the gas pressure detection device and the first control valve respectively.

[0009] The second equipment assembly includes a second box and a second control valve; the first control valve is connected to the second box; the second box is connected to the second control valve; the second control valve is connected to the vacuum pump; and the second box is used to place rock samples.

[0010] The third equipment assembly includes a third control valve and a high-pressure gas filling device; the high-pressure gas filling device is connected to the third control valve; the third control valve is connected to the first box; the high-pressure gas filling device is used to fill the first box with high-pressure gas.

[0011] In a second aspect, the present application provides a method for measuring the porosity of a low-permeability reservoir rock sample, which is applied to the low-permeability reservoir rock sample porosity measuring device described in the first aspect; the method comprises:

[0012] Step 101: Obtain the dead volume V1 of the device inner cavity of the second device component.

[0013] Step 102: Obtain the dead volume V2 of the device inner cavity of the first device component.

[0014] Step 103: After the rock sample is placed in the second box, the second equipment component and the first equipment component are vacuumed.

[0015] Step 104: Fill the first equipment component with high-pressure gas until the pressure change value detected by the gas pressure detection device is less than a predetermined threshold value, record the pressure value P1, and close the third control valve.

[0016] Step 105: Open the first control valve to diffuse the high-pressure gas in the first equipment component into the second equipment component until the pressure change value detected by the gas pressure detection device is less than the predetermined threshold value, and record the pressure value P2.

[0017] Step 106: Calculate the pore volume V of the rock sample according to the rock sample pore volume formula.

[0018] Step 107: Calculate the porosity of the rock sample according to the pore volume V of the rock sample.

[0019] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0020] The present application provides a device and method for measuring the porosity of a rock sample in a low permeability reservoir, the device comprising a first equipment component, a second equipment component, a third equipment component and a vacuum pump; wherein the first equipment component comprises a first box, a first control valve and a gas pressure detection device; the first box is connected to the gas pressure detection device and the first control valve respectively; the second equipment component comprises a second box and a second control valve; the first control valve is connected to the second box; the second box is connected to the second control valve; the second control valve is connected to the vacuum pump; the second box is used to place the rock sample; the third equipment component comprises a third control valve and a high-pressure gas filling device; the high-pressure gas filling device is connected to the third control valve; the third control valve is connected to the first box; the high-pressure gas filling device is used to fill the first box with high-pressure gas. The device can be used to measure the porosity of the rock sample by filling the pores of the rock sample with high-pressure gas, which can effectively avoid the problem of large errors in the porosity measurement results of the permeable reservoir due to the non-wettability of the liquid phase fluid, and improve the measurement accuracy of the porosity of the rock sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of a device for measuring the porosity of a low-permeability reservoir rock sample provided in one embodiment of the present application;

[0023] Figure 2 A schematic flow chart of a method for measuring the porosity of a low-permeability reservoir rock sample provided in one embodiment of the present application;

[0024] Figure 3 A schematic diagram of a device for measuring the porosity of a low-permeability reservoir rock sample provided in another embodiment of the present application;

[0025] Figure 4 A schematic diagram of the structure of a computer device provided in one embodiment of the present application.

[0026] Reference numerals:

[0027] 1-computer, 2-pressure acquisition box, 3-pressure sensor, 4-first pipeline, 5-first three-way valve, 6-second pipeline, 7-first single-way valve, 8-helium tank, 9-third pipeline, 10-second three-way valve, 11-fourth pipeline, 12-second single-way valve, 13-adsorption tank, 14-vacuum pump. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] See also Figure 1 In an exemplary embodiment, a device for measuring the porosity of a low-permeability reservoir rock sample is provided, wherein the device for measuring the porosity of a low-permeability reservoir rock sample comprises a first device component, a second device component, a third device component and a vacuum pump; wherein,

[0031] The first equipment component includes a first box, a first control valve and a gas pressure detection device; the first box is communicated with the gas pressure detection device and the first control valve respectively.

[0032] The second equipment assembly includes a second box and a second control valve; the first control valve is connected to the second box; the second box is connected to the second control valve; the second control valve is connected to the vacuum pump; and the second box is used to place rock samples.

[0033] The third equipment assembly includes a third control valve and a high-pressure gas filling device; the high-pressure gas filling device is connected to the third control valve; the third control valve is connected to the first box; the high-pressure gas filling device is used to fill the first box with high-pressure gas.

[0034] In another exemplary embodiment, the high pressure gas is a non-adsorbent gas.

[0035] In another exemplary embodiment, the non-adsorbing gas is helium.

[0036] See also Figure 2 In an exemplary embodiment, a method for measuring the porosity of a low-permeability reservoir rock sample is provided, and the method is applied to the low-permeability reservoir rock sample porosity measuring device described in any one of the device embodiments; the method comprises:

[0037] Step 101: Obtain the dead volume V1 of the inner cavity of the second device component, in cm 3 .

[0038] Step 102: Obtain the dead volume V2 of the inner cavity of the first device component, in cm 3.

[0039] Step 103: After the rock sample is placed in the second box, the second equipment component and the first equipment component are vacuumed. In this step, the third control valve is in a closed state.

[0040] Step 104: Fill the first device assembly with high-pressure gas until the pressure change value detected by the gas pressure detection device is less than a predetermined threshold, record the pressure value P1, and close the third control valve. In this step, the first control valve is in a closed state.

[0041] Step 105: Open the first control valve to diffuse the high-pressure gas in the first equipment component into the second equipment component until the pressure change value detected by the gas pressure detection device is less than the predetermined threshold value, and record the pressure value P2 in MPa.

[0042] Step 106: Calculate the pore volume V of the rock sample according to the rock sample pore volume formula.

[0043] Step 107: Calculate the porosity of the rock sample according to the pore volume V of the rock sample.

[0044] The dead volumes V1 and V2 of the inner cavity of the device in step 101 and step 102 are respectively obtained by measuring the volumes of the gas extracted by the vacuum pump.

[0045] In another exemplary embodiment, the rock sample pore volume formula is as follows,

[0046]

[0047] Wherein, Z1 represents the compression coefficient of the gas when the pressure value is P1; Z2 represents the compression coefficient of the gas when the pressure value is P2; m represents the mass of the rock sample, in g; ρ represents the apparent density of the rock sample, in g / cm 3 .

[0048] In another exemplary embodiment, the steps 101 to 102 are executed repeatedly in a loop until the difference between the sum of the device cavity dead volume V1 and the device cavity dead volume V2 measured in two consecutive times is within 0.1 ml.

[0049] In another exemplary embodiment, the rock sample is a rock sample from which oil has been washed out, that is, the rock sample has been in a state of being free of oil before being placed in the adsorption tank.

[0050] In another exemplary embodiment, the rock sample is weighed before being placed in the second box to obtain the mass of the rock sample.

[0051] In another exemplary embodiment, the step 101 specifically includes:

[0052] The inner cavity of the second device assembly is evacuated, and the dead volume V1 of the inner cavity of the second device assembly is measured. In this step, the second control valve is in an open state, and the first control valve and the third control valve are both in a closed state.

[0053] Furthermore, in step 101, the vacuuming time is 1 hour.

[0054] In another exemplary embodiment, step 102 specifically includes:

[0055] The inner cavity of the equipment of the first equipment component is evacuated, and the dead volume V2 of the inner cavity of the equipment of the first equipment component is measured.

[0056] After the equipment inner cavity of the second equipment component is evacuated (i.e., step 101), the first control valve can be opened to evacuate the equipment inner cavity of the first equipment component. In this step, the first control valve and the second control valve are in an open state, and the third control valve is in a closed state.

[0057] Furthermore, in step 102, the vacuuming time is 10 hours.

[0058] In another exemplary embodiment, the pressure value P1 ≤ 10 MPa.

[0059] See also Figure 3 In another exemplary embodiment, a device for measuring the porosity of a low-permeability reservoir rock sample is provided, wherein the device for measuring the porosity of a low-permeability reservoir rock sample comprises a pressure detection device, a vacuum pump, a helium tank, a first three-way valve, a second three-way valve, a first single-way valve, a second single-way valve, an adsorption tank, a first pipeline, a second pipeline, a third pipeline, and a fourth pipeline; wherein,

[0060] One end of the first pipeline is connected to the pressure detection device, and the other end of the first pipeline is connected to the first interface of the first three-way valve; the helium tank is connected to the first one-way valve; one end of the second pipeline is connected to the first one-way valve, and the other end of the second pipeline is connected to the second interface of the first three-way valve; one end of the third pipeline is connected to the third interface of the first three-way valve, and the other end of the third pipeline is connected to the third interface of the second three-way valve; one end of the fourth pipeline is connected to the second one-way valve, and the other end of the fourth pipeline is connected to the first interface of the second three-way valve; the second one-way valve is connected to the interior of the adsorption tank; the second interface of the second three-way valve is connected to the vacuum pump.

[0061] The first three-way valve includes a first control switch and a second control switch; the first control switch is used to control the conduction and disconnection of the first interface and the second interface of the first three-way valve; the second control switch is used to control the conduction and disconnection of the first interface and the third interface of the first three-way valve.

[0062] The second three-way valve includes a third control switch and a fourth control switch; the third control switch is used to control the conduction and disconnection of the first interface and the second interface of the second three-way valve; the fourth control switch is used to control the conduction and disconnection of the first interface and the third interface of the second three-way valve.

[0063] Figure 3 , ① represents the first control switch of the first three-way valve; ② represents the second control switch of the first three-way valve; ③ represents the third control switch of the second three-way valve; ④ represents the fourth control switch of the second three-way valve.

[0064] In another exemplary embodiment, the adsorption tank comprises an adsorption tank body and an adsorption tank sealing cover; the adsorption tank body is threadedly connected to the adsorption tank sealing cover.

[0065] In another exemplary embodiment, the pressure detection equipment includes a pressure acquisition device, a pressure sensor and a computer; the computer, the pressure acquisition device and the pressure sensor are connected in sequence; the pressure sensor is connected to one end of the first pipeline; the pressure acquisition device is used to obtain the pressure data detected by the pressure sensor and upload the pressure data to the computer.

[0066] The device is simple, has high measurement accuracy, small error, and is easy to maintain, low cost, and easy to repair and operate. The pore volume of low-permeability reservoir rock samples can be directly measured by saturated helium, and the results are accurate and highly reliable.

[0067] In another exemplary embodiment, a method for measuring the porosity of a low-permeability reservoir rock sample is provided, and the method is applied to the low-permeability reservoir rock sample porosity measuring device described in any one of the device embodiments; the method comprises:

[0068] Step 101: close the first one-way valve and the first control switch and the second control switch of the first three-way valve, and open the second one-way valve and the third control switch and the fourth control switch of the second three-way valve.

[0069] Step 102: Turn on the vacuum pump, evacuate the inner cavity of the third pipeline, the second three-way valve, the second single-way valve, the fourth pipeline and the adsorption tank to a first set time, and measure the dead volume V1 of the inner cavity of the third pipeline, the second three-way valve, the second single-way valve, the fourth pipeline and the adsorption tank, in cm 3 .

[0070] Step 103: Open the first one-way valve and the first control switch and the second control switch of the first three-way valve;

[0071] Step 104: Evacuate the inner cavity of the pressure sensor, the first pipeline, the helium tank, the first one-way valve, the second pipeline, and the first three-way valve to a second set time, and measure the dead volume V2 of the inner cavity of the pressure sensor, the first pipeline, the helium tank, the first one-way valve, the second pipeline, and the first three-way valve, in cm 3 .

[0072] Step 105: Turn off the vacuum pump.

[0073] Step 106: After the rock sample is placed in the adsorption tank, the first one-way valve, the first control switch and the second control switch of the first three-way valve, the second one-way valve, and the third control switch and the fourth control switch of the second three-way valve are opened.

[0074] Step 107: Turn on the vacuum pump to evacuate the device to a third set time.

[0075] Step 108: Close the second control switch of the first three-way valve.

[0076] Step 109: After the helium tank is filled with high-pressure helium, when the pressure change value detected by the pressure sensor is less than a predetermined threshold, the pressure value P1 is recorded.

[0077] Step 110: close the third control switch of the second three-way valve, open the second control switch of the first three-way valve, and record the pressure value P2 when the pressure change value detected by the pressure sensor is less than a predetermined threshold.

[0078] That is, in this step, all valves in the device except the one connected to the vacuum pump are opened, and the pressure sensor detects the pressure change. After the pressure stabilizes, the pressure value P2 is recorded.

[0079] Step 111: Calculate the pore volume V of the rock sample according to the rock sample pore volume formula.

[0080] Step 112: Calculate the porosity of the rock sample according to the pore volume V of the rock sample.

[0081] The porosity of a rock sample is equal to the ratio of the pore volume V of the rock sample to the apparent volume of the rock sample.

[0082] This solution is mainly based on the principle of Boyle's law. Compared with nitrogen and carbon dioxide, helium has no adsorption effect, the viscosity of the gas is small, and the measurement result error is small. The compressibility of the gas is taken into account, and the compression factor is introduced in the calculation, which greatly improves the scientificity and reliability of the measurement.

[0083] In another exemplary embodiment, the steps 102 to 104 are executed in a loop for multiple times until the difference between the sum of the dead volume V1 and the dead volume V2 measured in two consecutive times is within 0.1 ml.

[0084] That is to say, when measuring, first use a vacuum pump to evacuate the entire device to the set time, and measure the dead volume of each part of the device. The sum of the dead volumes of the internal cavities of the pressure sensor, the first pipeline, the helium tank, the first one-way valve, the second pipeline, and the first three-way valve is V1. The dead volume of the internal cavity of the third pipeline, the second three-way valve, the second one-way valve, and the adsorption tank is V2. The dead volume of each part of the device is tested multiple times until the difference in the dead volume measurement results of the entire device is within 0.1ml each time, indicating that the dead volume measurement is correct.

[0085] In another exemplary embodiment, the rock sample is a rock sample from which oil has been washed out, that is, the rock sample has been in a state of being free of oil before being placed in the adsorption tank.

[0086] In another exemplary embodiment, the rock sample is weighed before being placed in the adsorption tank to obtain the mass of the rock sample.

[0087] In another exemplary embodiment, the first set time is 1 hour.

[0088] In another exemplary embodiment, the second set time is 10 hours.

[0089] The present application also provides an application scenario, which applies the above method for measuring the porosity of a low-permeability reservoir rock sample. Specifically: the method for measuring the porosity of a low-permeability reservoir rock sample provided in this embodiment can be applied in the low-permeability reservoir rock sample porosity measurement scenario.

[0090] In an exemplary embodiment, a computer device is provided. The computer device may be a server or a terminal. The internal structure diagram thereof may be as follows: Figure 4As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to measure data. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for measuring the porosity of a low-permeability reservoir rock sample is implemented.

[0091] Those skilled in the art will understand that Figure 4 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components. In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0092] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0093] In an exemplary embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0094] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0095] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0096] The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0097] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0098] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A device for measuring the porosity of a low-permeability reservoir rock sample, characterized in that: The device for measuring the porosity of a low-permeability reservoir rock sample comprises a first equipment component, a second equipment component, a third equipment component and a vacuum pump; wherein, The first equipment assembly includes a first box, a first control valve and a gas pressure detection device; the first box is communicated with the gas pressure detection device and the first control valve respectively; The second equipment assembly includes a second box and a second control valve; the first control valve is connected to the second box; the second box is connected to the second control valve; the second control valve is connected to the vacuum pump; the second box is used to place the rock sample; The third equipment assembly includes a third control valve and a high-pressure gas filling device; the high-pressure gas filling device is connected to the third control valve; the third control valve is connected to the first box; the high-pressure gas filling device is used to fill the first box with high-pressure gas.

2. The device for measuring the porosity of a low-permeability reservoir rock sample according to claim 1, characterized in that: The high-pressure gas is a non-adsorbent gas.

3. A method for measuring the porosity of a low-permeability reservoir rock sample, characterized in that: The method for measuring the porosity of a low-permeability reservoir rock sample is applied to the low-permeability reservoir rock sample porosity measuring device according to any one of claims 1 to 2; the method for measuring the porosity of a low-permeability reservoir rock sample comprises: Step 101: Obtaining the dead volume V1 of the inner cavity of the second device component; Step 102: Obtaining the dead volume V2 of the inner cavity of the first device component; Step 103: After the rock sample is placed in the second box, the second equipment component and the first equipment component are vacuumed; Step 104: Fill the first device assembly with high-pressure gas until the pressure change value detected by the gas pressure detection device is less than a predetermined threshold, record the pressure value P1, and close the third control valve; Step 105: Open the first control valve to diffuse the high-pressure gas in the first device component into the second device component until the pressure change value detected by the gas pressure detection device is less than the predetermined threshold value, and record the pressure value P2; Step 106: Calculate the pore volume V of the rock sample according to the rock sample pore volume formula; Step 107: Calculate the porosity of the rock sample according to the pore volume V of the rock sample.

4. The method for measuring the porosity of a low-permeability reservoir rock sample according to claim 3, characterized in that: The rock sample pore volume formula is as follows: Wherein, Z1 represents the compression coefficient of the gas when the pressure value is P1; Z2 represents the compression coefficient of the gas when the pressure value is P2; m represents the mass of the rock sample; ρ represents the apparent density of the rock sample.

5. The method for measuring the porosity of a low-permeability reservoir rock sample according to claim 3, characterized in that: The steps 101 to 102 are executed repeatedly in a loop until the difference between the sum of the device cavity dead volume V1 and the device cavity dead volume V2 measured in two consecutive times is within 0.1 ml.

6. The method for measuring the porosity of a low-permeability reservoir rock sample according to claim 3, characterized in that: The rock sample is a rock sample from which oil has been washed away.

7. The method for measuring the porosity of a low-permeability reservoir rock sample according to claim 6, characterized in that: Before the rock sample is placed in the second box, it is weighed to obtain the mass of the rock sample.

8. The method for measuring the porosity of a low-permeability reservoir rock sample according to claim 3, characterized in that: The step 101 specifically includes: The inner cavity of the equipment of the second equipment component is evacuated, and the dead volume V1 of the inner cavity of the equipment of the second equipment component is measured.

9. The method for measuring the porosity of a low-permeability reservoir rock sample according to claim 8, characterized in that: The step 102 specifically includes: The inner cavity of the equipment of the first equipment component is evacuated, and the dead volume V2 of the inner cavity of the equipment of the first equipment component is measured.

10. The method for measuring the porosity of a low-permeability reservoir rock sample according to claim 3, characterized in that: The pressure value P1≤10MPa.

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