Device and method for obtaining residual hydrocarbon gas in hydrocarbon source rock

Abstract

The invention relates to the technical field of hydrocarbon source rock research, aims to solve the problem of how to improve the accuracy of test analysis of residual gas in hydrocarbon source rocks, and provides a device for obtaining residual hydrocarbon gas in hydrocarbon source rocks and a method for obtaining residual hydrocarbon gas in hydrocarbon source rocks. According to the device for obtaining the residual hydrocarbon gas in the hydrocarbon source rock, replacement gas is introduced into a first gas inlet pipeline, air in a sample pipe and gas attached to the surface of a first hydrocarbon source rock sample are discharged through a first gas outlet branch pipe, and then the first hydrocarbon source rock sample is heated by a heating furnace to obtain a first gas sample; replacement gas is introduced into a second gas inlet pipeline, air in a crushing cavity and gas attached to the surface of a second hydrocarbon source rock sample are discharged through a second gas outlet branch pipe, and then the second hydrocarbon source rock sample is crushed by a low-temperature electromagnetic crusher to obtain a second gas sample; therefore, the influence of communicating pores of the hydrocarbon source rock or air adsorbed on the surface of the hydrocarbon source rock is reduced, and the effect of improving the accuracy of test analysis is achieved.

Description

Technical Field

[0001] This application relates to the technical field of source rock research. Specifically, it relates to an apparatus and method for obtaining residual hydrocarbon gases in source rocks. Background Art

[0002] Trace hydrocarbon gases remaining in source rocks can better retain the characteristics of the original gases. Because these gases are in a relatively closed environmental condition during the generation and evolution process, reducing the material exchange with the external environment, thus maintaining their original chemical composition and physical properties. The traditional method for obtaining residual gases in rocks mainly uses vacuum pumping for degassing treatment and detection.

[0003] In the prior art, during the vacuum pumping process, the gases in the connected pores of the source rock or adsorbed on the surface of the source rock will be pumped away, resulting in the introduction of air into the pumped gas, which affects the accuracy of the residual gas test analysis in the source rock. How to solve the above technical problems is what those skilled in the art need to consider. Summary of the Invention

[0004] This application provides an apparatus for obtaining residual hydrocarbon gases in source rocks and a method for obtaining residual hydrocarbon gases in source rocks to solve the problem of how to improve the accuracy of the residual gas test analysis in source rocks.

[0005] An embodiment of this application provides an apparatus for obtaining residual hydrocarbon gases in source rocks, including a first sample processing member, a second sample processing member, and a collection member. The first sample processing member includes a heating furnace, a sample tube, a first intake pipeline, and a first outlet branch pipe. The sample tube is used for placing a first source rock sample. The heating furnace is arranged circumferentially around the sample tube and is used for heating the first source rock sample in the sample tube. One end of the sample tube is communicated with the first intake pipeline, and the other end is communicated with the first outlet branch pipe. The second sample processing member includes a low-temperature electromagnetic crusher, a second intake pipeline, and a second outlet branch pipe. A crushing chamber is provided in the middle of the low-temperature electromagnetic crusher. The crushing chamber is used for placing a second source rock sample. The low-temperature electromagnetic crusher is used for crushing the second source rock sample. One end of the crushing chamber is communicated with the second intake pipeline, and the other end is communicated with the second outlet branch pipe. The collection member is respectively communicated with the sample tube and the crushing chamber, and is used for obtaining a first gas sample in the first source rock sample and / or a second gas sample in the second source rock sample for analysis.

[0006] Compared with the prior art, the device for obtaining residual hydrocarbon gas in a source rock discharges the air in the sample tube and the gas adhering to the surface of the first source rock sample through the first air outlet branch pipe by introducing a displacement gas into the first intake pipe, and then heats the first source rock sample with a heating furnace to obtain a first gas sample; discharges the air in the crushing chamber and the gas adhering to the surface of the second source rock sample through the second air outlet branch pipe by introducing a displacement gas into the second intake pipe, and then crushes the second source rock sample with a low-temperature electromagnetic crusher to obtain a second gas sample; a collecting member obtains the first gas sample and / or the second gas sample for analysis, thereby reducing the influence of the connected pores in the source rock or the air adsorbed on the surface of the source rock, so as to achieve the effect of improving the accuracy of the test analysis of the residual gas in the source rock.

[0007] In a possible implementation manner, the device for obtaining residual hydrocarbon gas in a source rock further includes a gas treatment member. One end of the gas treatment member is respectively connected to the sample tube and the crushing chamber, and the other end is connected to the collecting member. The first gas sample and / or the second gas sample enter the collecting member after passing through the gas treatment member.

[0008] In a possible implementation manner, the gas treatment member includes a dust remover and a dryer. The dust remover is used for removing dust from the first gas sample and / or the second gas sample, and the dryer is used for removing water from the first gas sample and / or the second gas sample.

[0009] In a possible implementation manner, the dryer includes phosphorus pentoxide desiccant, and the dust remover includes a quartz wool filter.

[0010] In a possible implementation manner, the collecting member includes an enrichment cold trap and a vacuum pump. The enrichment cold trap is respectively connected to the sample tube and the crushing chamber, and the vacuum pump is connected to the enrichment cold trap. The vacuum pump is used for evacuating the enrichment cold trap to form a negative pressure, so that the first gas sample and / or the second gas sample flow to the enrichment cold trap.

[0011] In a possible implementation manner, the shape of the enrichment cold trap is U-shaped tubular.

[0012] In a possible implementation manner, there are two enrichment cold traps, and the two enrichment cold traps are connected in series.

[0013] In a possible implementation manner, the collection member further includes a carrier gas pipeline, a vacuum six-way valve, and an analysis member. The vacuum six-way valve is respectively connected to the carrier gas pipeline, the analysis member, and the enrichment cold trap. The carrier gas pipeline is used to introduce a carrier gas so that the first gas sample and / or the second gas sample enter the analysis member, and the analysis member is used to analyze and detect the first gas sample and / or the second gas sample.

[0014] An embodiment of the present application further provides a method for obtaining residual hydrocarbon gases in a hydrocarbon source rock, including providing the device for obtaining residual hydrocarbon gases in a hydrocarbon source rock, and using a heating degassing method and / or a mechanical crushing degassing method to obtain a gas sample for analysis. The heating degassing method includes the following steps: putting the first hydrocarbon source rock sample into the sample tube, and introducing a displacement gas through the first intake pipeline so that the air in the sample tube and the gas attached to the surface of the first hydrocarbon source rock sample are discharged through the first outlet branch pipe; closing the sample tube and starting the heating furnace to perform heating degassing on the first hydrocarbon source rock sample in the sample tube. The mechanical crushing degassing method includes the following steps: putting the second hydrocarbon source rock sample into the crushing cavity, and introducing a displacement gas through the second intake pipeline so that the air in the crushing cavity and the gas attached to the surface of the second hydrocarbon source rock sample are discharged through the second outlet branch pipe; closing the crushing cavity and starting the low-temperature electromagnetic crusher to perform mechanical crushing degassing on the second hydrocarbon source rock sample in the sample tube.

[0015] In a possible implementation manner, the particle size range of the first hydrocarbon source rock sample includes 1 to 2 mesh, 2 to 5 mesh, 10 to 20 mesh, the set heating temperature includes 80°C, 100°C, 120°C, 150°C, 180°C, and the set heating time includes 2 min, 4 min, 6 min, 8 min, 10 min. The particle size range of the second hydrocarbon source rock sample includes 0.3 cm to 0.5 cm, and the crushing time value includes 15 s, 30 s, 45 s, 60 s, 90 s. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic structural diagram of a device for obtaining residual hydrocarbon gases in a hydrocarbon source rock according to an embodiment of the present application.

[0018] Main Component Symbol Explanation: 1. Device for obtaining residual hydrocarbon gas in source rock; 11. First sample treatment part; 111. Heating furnace; 112. Sample tube; 113. First intake pipeline; 114. First outlet branch pipe; 12. Second sample treatment part; 121. Low-temperature electromagnetic crusher; 122. Crushing chamber; 123. Second intake pipeline; 124. Second outlet branch pipe; 13. Collection part; 131. Enrichment cold trap; 132. Vacuum pump; 133. Carrier gas pipeline; 134. Vacuum six-way valve; 135. Analysis part; 14. Gas treatment part; 141. Dust remover; 142. Dryer; 15. Thin-film pressure gauge. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

[0020] Some implementation manners of the present application will be described in detail. Without conflict, the following implementation manners and the features in the implementation manners can be combined with each other.

[0021] Embodiment Please refer to Figure 1 , this embodiment provides a device 1 for obtaining residual hydrocarbon gas in source rock, including a first sample treatment part 11, a second sample treatment part 12 and a collection part 13. The first sample treatment part 11 includes a heating furnace 111, a sample tube 112, a first intake pipeline 113 and a first outlet branch pipe 114. The sample tube 112 is used to place the first source rock sample. The heating furnace 111 is arranged circumferentially around the sample tube 112, and the heating furnace 111 is used to heat the first source rock sample in the sample tube 112. One end of the sample tube 112 is communicated with the first intake pipeline 113, and the other end is communicated with the first outlet branch pipe 114. The second sample treatment part 12 includes a low-temperature electromagnetic crusher 121, a second intake pipeline 123 and a second outlet branch pipe 124. A crushing chamber 122 is arranged in the middle of the low-temperature electromagnetic crusher 121. The crushing chamber 122 is used to place the second source rock sample. The low-temperature electromagnetic crusher 121 is used to crush the second source rock sample. One end of the crushing chamber 122 is communicated with the second intake pipeline 123, and the other end is communicated with the second outlet branch pipe 124. The collection part 13 is respectively communicated with the sample tube 112 and the crushing chamber 122. The collection part 13 is used to obtain the first gas sample in the first source rock sample and / or the second gas sample in the second source rock sample for analysis.

[0022] The device 1 for obtaining residual hydrocarbon gas in source rocks discharges the air in the sample tube 112 and the gas attached to the surface of the first source rock sample through the first outlet branch pipe 114 by introducing a replacement gas into the first intake pipe 113, and then the heating furnace 111 heats the first source rock sample to obtain a first gas sample; by introducing a replacement gas into the second intake pipe 123, the air in the crushing chamber 122 and the gas attached to the surface of the second source rock sample are discharged through the second outlet branch pipe 124, and then the low-temperature electromagnetic crusher 121 crushes the second source rock sample to obtain a second gas sample; the collector 13 obtains the first gas sample and / or the second gas sample for analysis, thereby reducing the influence of the air in the connected pores of the source rock or adsorbed on the surface of the source rock, and improving the accuracy of the test analysis of the residual gas in the source rock.

[0023] In this embodiment, the device 1 for obtaining residual hydrocarbon gas in source rocks can choose to use only the first sample treatment part 11 to obtain the first gas sample by the heating degassing method, or use only the second sample treatment part 12 to obtain the second gas sample by the mechanical crushing degassing method, or use the first sample treatment part 11 and the second sample treatment part 12 simultaneously.

[0024] The device 1 for obtaining residual hydrocarbon gas in source rocks replaces the traditional vacuum pumping operation through an appropriate replacement gas medium replacement technology. The gas medium can be an inert gas, helium, neopentane, high-pressure steam, etc., to be used to replace the air in the sample tube 112, and obtain trace residual gas in the source rock by the heating method or the crushing method without vacuum pumping, so as to realize that the obtained residual hydrocarbon gas can accurately reflect the original characteristics of the residual gas in the source rock. The device 1 for obtaining residual hydrocarbon gas in source rocks reduces the influence of external factors on hydrocarbon gas through the heating degassing method and / or the mechanical crushing degassing method, thereby improving the repeatability of data and the fidelity of residual gas characteristics, and improving the accuracy of the test analysis of the residual gas in the source rock.

[0025] In a possible implementation manner, the device 1 for obtaining residual hydrocarbon gas in source rocks further includes a gas treatment part 14. One end of the gas treatment part 14 is respectively connected to the sample tube 112 and the crushing chamber 122, and the other end is connected to the collector 13. The first gas sample and / or the second gas sample enter the collector 13 after passing through the gas treatment part 14.

[0026] In this embodiment, for the first gas sample obtained by the heating degassing method and the second gas sample obtained by the mechanical crushing degassing method, dust removal and water treatment are first performed through the gas treatment part 14. A highly efficient quartz wool filter is used for dust removal, and phosphorus pentoxide desiccant commonly used in laboratory chromatographs is used for water removal to effectively remove the water molecules in the first gas sample and / or the second gas sample while maintaining the integrity of other gas components.

[0027] In a possible implementation, the gas processing member 14 includes a dust collector 141 and a dryer 142. The dust collector 141 is used for removing dust from the first gas sample and / or the second gas sample, and the dryer 142 is used for removing water from the first gas sample and / or the second gas sample.

[0028] In this embodiment, the dryer 142 includes a phosphorus pentoxide desiccant, and the dust collector 141 includes a quartz wool filter.

[0029] In a possible implementation, the collection member 13 includes an enrichment cold trap 131 and a vacuum pump 132. The enrichment cold trap 131 is respectively connected to the sample tube 112 and the crushing chamber 122, and the vacuum pump 132 is connected to the enrichment cold trap 131. The vacuum pump 132 is used for evacuating the enrichment cold trap 131 to form a negative pressure, so that the first gas sample and / or the second gas sample flows to the enrichment cold trap 131. The shape of the enrichment cold trap 131 is U-shaped tubular.

[0030] In this embodiment, the shape of the enrichment cold trap 131 is U-shaped, and the first gas sample and / or the second gas sample is enriched by the enrichment cold trap 131 so that the gas concentration meets the detection requirements of the analysis member 135.

[0031] The device 1 for obtaining residual hydrocarbon gases in a source rock further includes a plurality of diaphragm pressure gauges 15. The diaphragm pressure gauges 15 are connected to the enrichment cold trap 131 for detecting the negative pressure of the enrichment cold trap 131. The diaphragm pressure gauges 15 can also be arranged between the sample tube 112 and the crushing chamber 122 for detecting the pressure values of the sample tube 112 and the crushing chamber 122. This is beneficial for the formed negative pressure to make the first gas sample and / or the second gas sample flow to the enrichment cold trap 131.

[0032] In a possible implementation, there are two enrichment cold traps 131, and the two enrichment cold traps 131 are connected in series. The collection member 13 further includes a carrier gas pipeline 133, a vacuum six-way valve 134, and an analysis member 135. The vacuum six-way valve 134 is respectively connected to the carrier gas pipeline 133, the analysis member 135, and the enrichment cold trap 131. The carrier gas pipeline 133 is used for introducing a carrier gas to make the first gas sample and / or the second gas sample enter the analysis member 135, and the analysis member 135 is used for analyzing and detecting the first gas sample and / or the second gas sample.

[0033] In this embodiment, the analysis member 135 is a chromatograph / mass spectrometer analysis unit. The device 1 for obtaining residual hydrocarbon gases in a source rock obtains the residual gas in the source rock through two enrichment cold traps 131, and the residual gas enters the analysis member 135 through the vacuum six-way valve 134 for analysis and detection.

[0034] An embodiment of the present application further provides a method for obtaining residual hydrocarbon gas in a source rock, including providing a device 1 for obtaining residual hydrocarbon gas in a source rock, and using a heating degassing method and / or a mechanical crushing degassing method to obtain a gas sample for analysis. The heating degassing method includes the following steps: placing a first source rock sample into a sample tube 112, introducing a displacement gas through a first intake pipe 113 so that the air in the sample tube 112 and the gas attached to the surface of the first source rock sample are discharged through a first outlet branch pipe 114; closing the sample tube 112 and starting a heating furnace 111 to heat and degas the first source rock sample in the sample tube 112. The mechanical crushing degassing method includes the following steps: placing a second source rock sample into a crushing chamber 122, introducing a displacement gas through a second intake pipe 123 so that the air in the crushing chamber 122 and the gas attached to the surface of the second source rock sample are discharged through a second outlet branch pipe 124; closing the crushing chamber 122 and starting a low-temperature electromagnetic crusher 121 to mechanically crush and degas the second source rock sample in the sample tube 112.

[0035] In this embodiment, the method for obtaining residual hydrocarbon gas in a source rock uses a heating degassing method and a mechanical crushing method to collect the residual gas in the source rock, avoiding vacuum pumping operations, adopting an appropriate gas medium replacement technology, and replacing the air in the source rock sample. The method for obtaining residual hydrocarbon gas in a source rock provided in this embodiment can not only obtain the original residual gas in the source rock to the maximum extent, but also faithfully present its inherent characteristics. The method for obtaining residual hydrocarbon gas in a source rock can effectively avoid problems such as sample contamination and poor repeatability caused by vacuum operations through gas medium replacement, thereby improving the reliability and accuracy of experimental results.

[0036] In a possible implementation manner, the particle size range of the first source rock sample includes 1 to 2 mesh, 2 to 5 mesh, 10 to 20 mesh, the set heating temperature includes 80°C, 100°C, 120°C, 150°C, 180°C, and the set heating time includes 2 min, 4 min, 6 min, 8 min, 10 min. The particle size range of the second source rock sample includes 0.3 cm to 0.5 cm, and the crushing time value includes 15 s, 30 s, 45 s, 60 s, 90 s.

[0037] In this embodiment, the specific implementation steps of the heating degassing method are as follows: Sample preparation and loading: First, place the first source rock sample to be processed into the sample tube 112. During the loading process, make the sample evenly distributed to improve the degassing efficiency and reduce experimental errors; Air replacement step: Subsequently, a medium for replacing air is introduced from the first intake pipe 113 to effectively remove the air in the sample tube 112. The air is discharged through the first outlet branch pipe 114, and the operator needs to continuously monitor the discharged gas until it is confirmed that the air in the sample tube 112 is completely removed; Heating degassing procedure: After the air is completely removed, the sample tube 112 is sealed and the heating degassing procedure is started. During this process, by selecting appropriate heating temperature and heating time, the influence on the characteristics of residual gas is reduced, the potential interference of heating products on the experimental results is reduced, and the accuracy and reliability of the data are improved. In the experiment, the same set of sample particle sizes is selected (the sample particle sizes for the heating degassing method are planned to be several specifications such as 1-2 mesh, 2-5 mesh, 5-10 mesh, 10-20 mesh, etc.). The heating temperature is planned to be set at several temperature points such as 80 °C, 100 °C, 120 °C, 150 °C, 180 °C, and the heating time is planned to be set at 2 min, 4 min, 6 min, 8 min, 10 min. Appropriate parameters are selected based on the properties of different source rocks to improve the accuracy of the experimental results. In the experiment, the temperature gradient = △T / △t is plotted, where △T represents the unit temperature change and △t represents the unit time change. In actual operation, the content of residual gas in the source rock generally first increases with the increase of the temperature gradient (this temperature does not exceed the thermal simulation hydrocarbon generation temperature of the source rock) until the critical temperature is reached. Therefore, according to different temperature gradients and sample particle size parameters, repeated tests, corrections, analyses, and inductions are carried out to find the most suitable relevant parameters for various samples, and the gradient is further reduced during this period for further experiments to obtain the trace residual gas in the source rock with the highest degree of fidelity.

[0038] In this embodiment, the specific implementation steps of the mechanical crushing method are as follows: Sample placement and loading: The second source rock sample is placed into the crushing chamber 122 of the low-temperature electromagnetic crusher 121. During the placement process, attention should be paid to the filling density of the sample; Air replacement operation: A medium for replacing air is introduced through the second intake pipe 123, and at the same time, air is discharged through the second outlet branch pipe 124 until the air is completely removed, creating an air-free interference environment for crushing and degassing; Crushing and degassing execution: The mechanical crushing and degassing method selects a sample particle size of 0.3 cm - 0.5 cm, and the crushing time is planned to be selected as 15S, 30S, 45S, 60S, 90S. Selecting an appropriate particle size can reduce the secondary adsorption of gas, thereby more accurately reflecting the trace residual gas in the source rock.

[0039] In the mechanical crushing degassing method, the valve of the collection piece 13 is closed, and the collection piece 13 is evacuated to a vacuum state by the vacuum pump 132. The first gas sample and / or the second gas sample will automatically move towards the collection piece 13 according to the pressure change, and the residual gas of the hydrocarbon source rock generated by crushing is carried out to the greatest extent. The mechanical crushing degassing method effectively reduces the secondary adsorption of gas, which helps the obtained gas sample to truly reflect the geochemical characteristics of the desorbed gas of the hydrocarbon source rock. On this basis, relevant functions of different sample particle sizes and crushing times are designed to determine the most suitable correlation coefficient, and the gradient is further reduced for experiments during this period. According to the properties of different samples, the required methods and parameters are determined to obtain the trace residual gas in the hydrocarbon source rock with the highest possible fidelity, and the accuracy and reliability of the experimental results are improved. After closing the crushing tank, the crushing degassing program is started, and the effective release of the residual trace hydrocarbon gas in the sample is achieved through the action of mechanical force.

[0040] In summary, for the device 1 for obtaining the residual hydrocarbon gas in the hydrocarbon source rock provided in this embodiment, by introducing a replacement gas into the first intake pipe 113, the air in the sample tube 112 and the gas attached to the surface of the first hydrocarbon source rock sample are discharged through the first outlet branch pipe 114, and then the heating furnace 111 heats the first hydrocarbon source rock sample to obtain the first gas sample; by introducing a replacement gas into the second intake pipe 123, the air in the crushing chamber 122 and the gas attached to the surface of the second hydrocarbon source rock sample are discharged through the second outlet branch pipe 124, and then the low-temperature electromagnetic crusher 121 crushes the second hydrocarbon source rock sample to obtain the second gas sample; the collection piece 13 obtains the first gas sample and / or the second gas sample for analysis, thereby reducing the influence of the air in the connected pores of the hydrocarbon source rock or adsorbed on the surface of the hydrocarbon source rock, and improving the accuracy of the residual gas test analysis in the hydrocarbon source rock.

[0041] The above embodiments are only used to illustrate the technical solutions of the present application and not to limit them. Although the present application has been described in detail with reference to the above preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. An apparatus for obtaining residual hydrocarbon gas in a source rock, characterized in that, Comprising: A first sample processing component, including a heating furnace, a sample tube, a first intake pipeline, and a first outlet branch pipe. The sample tube is used to place a first source rock sample. The heating furnace is arranged circumferentially around the sample tube and is used to heat the first source rock sample in the sample tube. One end of the sample tube is communicated with the first intake pipeline, and the other end is communicated with the first outlet branch pipe; A second sample processing component, including a low-temperature electromagnetic crusher, a second intake pipeline, and a second outlet branch pipe. A crushing chamber is provided in the middle of the low-temperature electromagnetic crusher. The crushing chamber is used to place a second source rock sample. The low-temperature electromagnetic crusher is used to crush the second source rock sample. One end of the crushing chamber is communicated with the second intake pipeline, and the other end is communicated with the second outlet branch pipe; A collection component, which is respectively communicated with the sample tube and the crushing chamber. The collection component is used to obtain a first gas sample in the first source rock sample and / or a second gas sample in the second source rock sample for analysis.

2. The device for obtaining residual hydrocarbon gas in a source rock according to claim 1, characterized in that, Further comprising: A gas processing component. One end of the gas processing component is respectively communicated with the sample tube and the crushing chamber, and the other end is communicated with the collection component. The first gas sample and / or the second gas sample enter the collection component after passing through the gas processing component.

3. The device for obtaining residual hydrocarbon gases in a source rock according to claim 2, wherein: The gas processing component includes a dust remover and a dryer. The dust remover is used to remove dust from the first gas sample and / or the second gas sample, and the dryer is used to remove water from the first gas sample and / or the second gas sample.

4. The device for obtaining residual hydrocarbon gases in a source rock according to claim 3, wherein: The dryer includes a phosphorus pentoxide desiccant, and the dust remover includes a quartz wool filter.

5. The device for obtaining residual hydrocarbon gases in a source rock according to claim 1, wherein: The collection component includes an enrichment cold trap and a vacuum pump. The enrichment cold trap is respectively communicated with the sample tube and the crushing chamber. The vacuum pump is communicated with the enrichment cold trap. The vacuum pump is used to evacuate the enrichment cold trap to form a negative pressure, so that the first gas sample and / or the second gas sample flow to the enrichment cold trap.

6. The device for obtaining residual hydrocarbon gases in a source rock according to claim 5, wherein: The shape of the enrichment cold trap is U-shaped tubular.

7. The device for obtaining residual hydrocarbon gases in a source rock according to claim 5, wherein: There are two enrichment cold traps, and the two enrichment cold traps are connected in series.

8. The device for obtaining residual hydrocarbon gases in a source rock according to claim 5, wherein: The collection component further includes a carrier gas pipeline, a vacuum six-way valve, and an analysis component. The vacuum six-way valve is respectively communicated with the carrier gas pipeline, the analysis component, and the enrichment cold trap. The carrier gas pipeline is used to introduce a carrier gas to enable the first gas sample and / or the second gas sample to enter the analysis component, and the analysis component is used to analyze and detect the first gas sample and / or the second gas sample.

9. A method for obtaining residual hydrocarbon gas in a source rock, characterized in that, Comprising: Provided is an apparatus for obtaining residual hydrocarbon gas in a source rock, which uses a heating degassing method and / or a mechanical crushing degassing method to obtain a gas sample for analysis. The heating degassing method includes the following steps: Put the first source rock sample into the sample tube, and introduce a replacement gas through the first intake pipe so that the air in the sample tube and the gas attached to the surface of the first source rock sample are discharged through the first outlet branch pipe. Seal the sample tube and start the heating furnace to heat and degas the first source rock sample in the sample tube. The mechanical crushing degassing method includes the following steps: Put the second source rock sample into the crushing chamber, and introduce a replacement gas through the second intake pipe so that the air in the crushing chamber and the gas attached to the surface of the second source rock sample are discharged through the second outlet branch pipe. Seal the crushing chamber and start the low-temperature electromagnetic crusher to mechanically crush and degas the second source rock sample in the sample tube.

10. The method for obtaining residual hydrocarbon gas in a source rock according to claim 9, wherein: The particle size range of the first source rock sample includes 1 to 2 mesh, 2 to 5 mesh, 10 to 20 mesh, the set heating temperature includes 80 °C, 100 °C, 120 °C, 150 °C, 180 °C, and the set heating time includes 2 min, 4 min, 6 min, 8 min, 10 min. The particle size range of the second source rock sample includes 0.3 cm to 0.5 cm, and the crushing time values include 15 s, 30 s, 45 s, 60 s, 90 s.

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