Nanometer oil and gas detection method for identifying underground oil and gas reservoirs in arid gobi areas

Abstract

The invention relates to the technical field of oil-gas exploration, in particular to a nano oil-gas detection method for identifying underground oil-gas reservoirs in arid gobi areas, which comprises the following steps of: preparing a hydrocarbon gas collecting device by using a nano polymer alloy material; acquiring a soil free hydrocarbon gas sample of each designed sampling point by adopting the prepared hydrocarbon gas collecting device; measuring the content value of each component of the captured hydrocarbon gas and the content value of the total hydrocarbon gas in a laboratory; drawing a corresponding plane isogram, and delineating each component of the hydrocarbon gas and an abnormally high value region of the total hydrocarbon content; determining the type of the oil and gas reservoir according to the sample spectrogram characteristics measured by the sample laboratory in the abnormal high-value area; and determining the form of the oil-gas reservoir, the possible oil-gas-containing position and the buried depth of the oil-gas reservoir. According to the invention, the concentration of the hydrocarbon gas collected by the hydrocarbon gas collection device can be greatly improved, the free hydrocarbon collection is effectively realized, the oil-gas possibility of a drilling target can be quickly judged, and the exploration success rate is improved.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas exploration, and is a nano oil and gas detection method for identifying underground oil and gas reservoirs in arid Gobi areas. Background Art

[0002] Oil and gas are important strategic materials and major energy resources, and are an indispensable guarantee for a country's development. In the process of exploration and development for more than a hundred years, a large number of exploration and development technologies have been applied to improve the efficiency of oil and gas exploration and development. However, since oil and gas are stored deep underground, specific exploration and development technologies are required to discover and mine them from underground. There are various difficulties. At present, the overall success rate of oil and gas exploration has not been high, and a lot of investment has been wasted. Therefore, the research and development of various technologies to improve the success rate of exploration has always been the direction of efforts of oil and gas explorers. At present, gravity, magnetic method, electrical method, artificial seismic, logging and other technologies have been widely used in oil and gas exploration, especially high-precision three-dimensional seismic exploration has become an important technical means. With the development of the oil and gas exploration and development industry, most of the oil and gas resources with low exploration difficulty have been discovered and developed, and the exploration of the remaining oil and gas resources is becoming increasingly difficult, especially in the arid Gobi region in western my country. The complex surface topography seriously affects the changes in seismic velocity and the accuracy of the structural morphology of underground seismic geological research, further increasing the difficulty of exploration in the area. More effective exploration technology is needed to improve the success rate of exploration and reduce exploration costs.

[0003] In the existing technology, the mainstream exploration procedure is to identify the closures in the exploration area through seismic (especially 3D seismic) exploration technology, and then combine it with the study of petroleum geological conditions to determine the probability of reservoir formation in the closures, select the closures with high probability of reservoir formation, and deploy exploration wells. Since this method belongs to indirect oil exploration technology, there are many influencing factors, resulting in large uncertainties, especially under the influence of the complex surface geomorphological characteristics of the arid Gobi region in western my country, which makes the structural form and the actual underground structural form have serious differences, greatly reducing the success rate of oil and gas exploration. Direct oil exploration technology focuses on directly finding oil and gas reservoirs, ignoring the research and drilling of unfilled oil and gas traps, greatly reducing the workload of oil and gas exploration and improving the success rate of exploration.

[0004] Most of the existing direct oil exploration technologies are based on various attribute data and features extracted from seismic exploration data, which still have large multi-solutions and low accuracy. While surface geochemical exploration is a technology that directly identifies underground oil and gas reservoirs in arid Gobi areas, it has certain advantages, but many methods have some unresolved problems, which makes it difficult for such technologies to be well promoted and applied.

[0005] After the formation of oil and gas deep underground, they migrate and accumulate in the traps. Before and after the accumulation of oil and gas in the traps, the oil and gas will migrate to the surface until they are lost to the surface. The oil and gas escape to the surface along the open faults and become macro-seepage. However, due to the role of the caprock or other sealing bodies, the leakage of oil and gas in the oil and gas reservoir is very small and is called micro-seepage. These micro-seepages of oil and gas to the surface will cause a series of physical and chemical changes in the near-surface range of the crust. According to these change laws, many scholars have invented some geochemical methods for oil and gas exploration and have achieved some successful cases.

[0006] In most cases, hydrocarbon leakage is in the form of extremely small amounts of gas, so people cannot detect it intuitively. However, with the development of molecular-level analytical testing instrument technology, people can not only discover these qualitative phenomena through various testing instruments and methods, but also conduct quantitative testing and research on these phenomena. For example, foreign microbial oil and gas detection technology, KOV fingerprint technology and domestic adsorption wire free hydrocarbon gas detection technology are some of the representative technologies. However, due to the lack of a good solution to the surface environmental influencing factors and the collection of hydrocarbon gas in the soil, although these methods have been promoted and applied to a certain extent, the application effect is not very ideal.

[0007] In the past, geochemical oil and gas exploration methods were divided into direct and indirect methods. The direct geochemical oil and gas exploration method detects low concentrations of free hydrocarbons, with small values ​​and large errors; the indirect geochemical oil and gas exploration method is not very practical due to many influencing factors and multiple solutions. It was applied to a certain extent in the early stage. Recently, with the entry of geophysical technology into the field of oil and gas exploration, geochemical oil and gas exploration technology and methods are on the verge of being eliminated.

[0008] Most of the existing geochemical oil and gas exploration technologies directly study the surface soil, trying to extract hydrocarbons from it to infer the underground oil and gas situation. These geochemical oil and gas exploration technologies have shortcomings such as low reliability, too many detection indicators and low exploration success rate. Geochemical oil and gas exploration technologies need to be further improved. The existing technical system with seismic exploration technology as the core has the problems of long cycle, high cost and low exploration success rate, while the existing geochemical oil and gas exploration technology has the problems of too many detection indicators and low success rate.

[0009] Therefore, it is necessary to develop a nano-oil and gas detection method for identifying underground oil and gas reservoirs in arid Gobi areas to solve the above problems. Summary of the invention

[0010] The present invention provides a nano oil and gas detection method for identifying underground oil and gas reservoirs in arid Gobi areas, which overcomes the shortcomings of the above-mentioned prior art and can effectively solve the problems of the existing technical system with seismic exploration technology as the core, such as long existence cycle, high cost and low exploration success rate, and the existing geochemical oil and gas exploration technology, such as too many detection indicators and low success rate.

[0011] The technical solution of the present invention is achieved by the following measures: A nano oil and gas detection method for identifying underground oil and gas reservoirs in arid Gobi areas comprises the following steps: Step S1: preparing a hydrocarbon gas collection device using nano polymer alloy material; Step S2: using the hydrocarbon gas collection device prepared in step S1 to obtain soil free hydrocarbon gas samples at each designed sampling point; Step S3: According to the soil free hydrocarbon gas samples at each sampling point, the content values ​​of each component of the captured hydrocarbon gas and the total hydrocarbon gas content value are measured in the laboratory; Step S4: according to the values ​​of each component and total hydrocarbon content of hydrocarbon gas at each sample collection point, a corresponding plane contour map is drawn to delineate the areas with abnormally high values ​​of each component and total hydrocarbon content of hydrocarbon gas, so as to delineate the plane distribution range of oil and gas reservoirs; Step S5: determining the type of oil and gas reservoir according to the sample spectrum characteristics measured by the sample laboratory in the abnormally high value area, wherein the oil and gas reservoir type includes oil reservoir, gas reservoir or oil and gas reservoir; Step S6: Determine the shape of the oil and gas reservoir, possible oil and gas-bearing strata and their burial depth by combining the seismic exploration data and geological and drilling data in the region.

[0012] The following are further optimizations and / or improvements to the above technical solutions: In the above step S1, different types of nano-polymer alloy materials can be used to prepare the hydrocarbon gas collection device.

[0013] The above step S2 may specifically include the following steps: drilling a hole on the surface of each designed sampling point, placing a hydrocarbon gas collection device made of nano-polymer alloy material, and then restoring the soil; after a certain period of time, taking out the nano-hydrocarbon gas collection device at each sampling point and putting it into a sealed bottle.

[0014] The above step S3 may specifically include the following steps: desorbing hydrocarbon gas from each recovered hydrocarbon gas collection device according to the procedure; extracting the gas in each sealed bottle, performing hydrocarbon gas component analysis on the obtained hydrocarbon gas using a universal detection instrument, and obtaining the type and content of hydrocarbon gas in all hydrocarbon gas collection devices.

[0015] The above step S4 may specifically include the following steps: based on the components and contents of hydrocarbon gases in all hydrocarbon gas collection devices, draw contour maps of the contents of each component of hydrocarbon gas and total hydrocarbons, and obtain abnormally high value areas of each component of hydrocarbon gas and total hydrocarbons based on the contour maps, so as to determine the plane distribution range of the oil and gas reservoir.

[0016] The above step S6 may specifically include the following steps: according to the principle of vertical micro-leakage, the abnormally high value areas of hydrocarbon gas components and total hydrocarbons obtained by the hydrocarbon gas collection device are further combined with the seismic exploration data and geological and drilling data in the area to determine the shape of the oil and gas reservoir, possible oil and gas-bearing strata and their burial depth.

[0017] The present invention uses a hydrocarbon gas collection device made of nano-polymer alloy material to collect free hydrocarbons, which can greatly improve the concentration of hydrocarbon gas collected by the hydrocarbon gas collection device and effectively realize the collection of free hydrocarbons. The present invention can quickly determine the oil and gas content of the drilling target, improve the exploration success rate, and reduce the exploration cost. In particular, it is applied to oil and gas exploration in complex surface landforms in the arid Gobi region in western my country, which can improve the oil and gas exploration success rate in complex surface landforms in the arid Gobi region in western my country and reduce the exploration cost. The present invention changes the conventional exploration idea of ​​oil and gas exploration, which first identifies oil and gas closures through seismic geological discoveries and discovers oil and gas reservoirs through drilling. It uses the free hydrocarbon gas detection results as the basis for analysis and judgment, directly takes the search for oil and gas enrichment areas as the starting point, and further studies the specific conditions of the oil and gas reservoirs, thereby improving the exploration success rate, shortening the exploration cycle, and reducing the exploration cost, and has important economic significance. The present invention is superior to the existing surface oil and gas detection technology, especially has extremely obvious advantages in the arid Gobi region in western my country. Compared with the existing surface oil and gas detection technology, it has the advantages of wide application range, simple and convenient operation, consistent and comparable concentration of collected hydrocarbon gas, the concentration of collected hydrocarbon gas is not affected by the environment, the concentration of collected hydrocarbon gas is stable and reliable, and the detection results are accurate and applicable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Attached Figure 1 Schematic diagram of the overall structure of the nanometer high-precision oil and gas detection device according to an embodiment of the present invention.

[0019] Attached Figure 2 Schematic diagram of the top view of the nanometer high-precision oil and gas detection device according to an embodiment of the present invention.

[0020] Attached Figure 3 For attachment Figure 2 Schematic diagram of the cross section along the AA direction.

[0021] Attached Figure 4 The present invention is a flowchart of a nanometer high-precision oil and gas detection method for identifying underground oil and gas reservoirs in arid Gobi areas according to an embodiment of the present invention.

[0022] Attached Figure 5 The plane distribution map of the survey line designed for the nanometer high-precision oil and gas detection technology in the SB area in the embodiment of the present invention.

[0023] Attached Figure 6 This is a field construction flow chart of the nano high-precision oil and gas detection technology in the SB area in an embodiment of the present invention.

[0024] Attached Figure 7 This is a gas chromatogram of nanometer high-precision oil and gas detection in the SB region in an embodiment of the present invention.

[0025] Attached Figure 8 This is a plan view of the nanometer high-precision oil and gas detection results in the SB area in an embodiment of the present invention.

[0026] Attached Fig. 9 It is the superposition diagram of the nanometer high-precision oil and gas detection results in the SB area and the Lianmuqin Formation structure of the Cretaceous System in the embodiment of the present invention.

[0027] Attached Fig.10 It is the nanometer high-precision oil and gas detection results of the SB area in the embodiment of the present invention and the superposition map of the Jurassic Kalaza Formation structure.

[0028] Attached Fig.11 It is the superposition diagram of the nanometer high-precision oil and gas detection results in the SB area and the Jurassic Qiketai Formation structure in the embodiment of the present invention.

[0029] The codes in the attached drawings are: 1 is a sand-isolating outer tube, 2 is a water-isolating sleeve, 3 is a film, 4 is an inner support tube, 5 is a supporting ring plate, 6 is a gas extraction inner tube, and 7 is a sealing gasket. DETAILED DESCRIPTION

[0030] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0031] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As attached Figure 1 , 2 As shown in , 3, and 4, the nano oil and gas detection method for identifying underground oil and gas reservoirs in arid Gobi areas includes the following steps: Step S1: preparing a hydrocarbon gas collection device using nano polymer alloy material; Step S2: using the hydrocarbon gas collection device prepared in step S1 to obtain soil free hydrocarbon gas samples at each designed sampling point; Step S3: According to the soil free hydrocarbon gas samples at each sampling point, the content values ​​of each component of the captured hydrocarbon gas and the total hydrocarbon gas content value are measured in the laboratory; Step S4: according to the values ​​of each component and total hydrocarbon content of hydrocarbon gas at each sample collection point, a corresponding plane contour map is drawn to delineate the areas with abnormally high values ​​of each component and total hydrocarbon content of hydrocarbon gas, so as to delineate the plane distribution range of oil and gas reservoirs; Step S5: determining the type of oil and gas reservoir according to the sample spectrum characteristics measured by the sample laboratory in the abnormally high value area, wherein the oil and gas reservoir type includes oil reservoir, gas reservoir or oil and gas reservoir; Step S6: Determine the shape of the oil and gas reservoir, possible oil and gas-bearing strata and their burial depth by combining the seismic exploration data and geological and drilling data in the region.

[0032] In step S1, a hydrocarbon gas collection device is prepared using different types of nano-polymer alloy materials, and the materials are placed in a dedicated sealed bottle, such as Figures 1 to 3 shown.

[0033] The embodiment of the present invention uses a hydrocarbon gas collection device made of nano-polymer alloy material to collect free hydrocarbons, which can greatly increase the concentration of hydrocarbon gas collected by the hydrocarbon gas collection device and effectively realize the collection of free hydrocarbons. The concentration of hydrocarbon gas collected by the collection device can reach the percentage level, which is hundreds or even thousands of times the concentration of hydrocarbon gas collected by conventional hydrocarbon gas collection methods (see Table 1), so as to accurately judge the hydrocarbon gas abnormal area and background area in the study area, thereby accurately finding the oil and gas enrichment area.

[0034] The embodiments of the present invention can better apply the developed new technologies and methods to the production practice of oil and gas exploration, can quickly determine the oil and gas content of the drilling target, improve the exploration success rate, and reduce the exploration cost. In particular, it is applied to oil and gas exploration in complex surface landforms in the arid Gobi region in western my country, which can improve the oil and gas exploration success rate in complex surface landforms in the arid Gobi region in western my country and reduce the exploration cost. The embodiments of the present invention overcome the problems of the existing technical system with seismic exploration technology as the core, such as long cycle, high cost, and low exploration success rate, and can also overcome the problems of too many detection indicators and low success rate in the existing geochemical oil and gas exploration technology.

[0035] The embodiment of the present invention changes the conventional exploration concept of oil and gas exploration, which is to first identify oil and gas traps through seismic geological discoveries and then discover oil and gas reservoirs through drilling. It uses the free hydrocarbon gas detection results as the basis for analysis and judgment, directly starts from finding oil and gas enrichment areas, and then further studies the specific conditions of the oil and gas reservoirs, thereby improving the exploration success rate, shortening the exploration cycle, and reducing the exploration cost, which has important economic significance.

[0036] The sampler of the embodiment of the present invention is buried in the soil at a depth of 1 meter for 20-30 days, and collects free hydrocarbons continuously. The collection of free hydrocarbons is the result of continuous accumulation, which avoids the instability of the data and ensures the stability and reliability of the collected data. The concentration of hydrocarbon gas detected by this method is significantly higher than that of conventional technology by several thousand times, which avoids the reliability and accuracy of identifying abnormal areas of hydrocarbon gas distribution. Reducing the probability of drilling empty wells and dry wells can better improve the success rate of oil and gas exploration and reduce exploration costs.

[0037] The embodiments of the present invention are superior to existing surface oil and gas detection technologies, especially in the arid Gobi region in western my country. Compared with existing surface oil and gas detection technologies, the embodiments of the present invention have the following advantages: (1) Wide application range: Mountains, plains, hills, deserts, Gobi, jungles, rivers and lakes, valleys with dramatic ups and downs, etc. are all suitable for construction; (2) Simple and convenient operation: The electric drill used in the drilling construction of the embodiments of the present invention is small and light, and the 1.5-kilowatt electric drill required for construction weighs only a few kilograms; (3) The concentration of the collected hydrocarbon gas is consistent and comparable: The sampler used in this technology is a standard 2.5 cm diameter and 5 cm length The collected hydrocarbon gas concentration is stable and comparable; (4) The collected hydrocarbon gas concentration is not affected by the environment: the sampler of this technology is buried in the soil 1 meter underground, avoiding the influence of various environmental changes on the surface; (5) The collected hydrocarbon gas concentration is stable and reliable: the sampler of this technology continuously collects hydrocarbon gas in the underground soil for 20-30 days, avoiding the randomness of hydrocarbon gas collection; (6) The detection results are accurate and applicable: since the hydrocarbon gas concentration detected by the embodiment of the present invention reaches the percentage level, which is thousands of times the detection result of conventional free hydrocarbon detection technology, the background and anomaly differences are extremely large, it is very convenient to determine the oil and gas content of the underground and reduce misjudgment.

[0038] Embodiment 2: As attached Figure 1 , 2 As shown in Figures 3 and 4, in the nano-oil and gas detection method for identifying underground oil and gas reservoirs in arid Gobi areas, step S2 specifically includes the following steps: drilling a hole on the surface of each designed sampling point, placing a hydrocarbon gas collection device made of nano-polymer alloy material, and then restoring the soil; after a certain interval, taking out the nano-hydrocarbon gas collection device of each sampling point and putting it into a sealed bottle; wherein the interval time is preferably 20-30 days.

[0039] Embodiment 3: As attached Figure 1 , 2As shown in Figures 3 and 4, in the nano-oil and gas detection method for identifying underground oil and gas reservoirs in arid Gobi areas, step S3 specifically includes the following steps: desorbing hydrocarbon gases from each recovered hydrocarbon gas collection device according to a procedure; extracting gas from each sealed bottle, and performing hydrocarbon gas component analysis on the obtained hydrocarbon gas using a general detection instrument (such as a ppb-level gas chromatograph) to obtain the types and contents of hydrocarbon gases in all hydrocarbon gas collection devices.

[0040] Embodiment 4: As attached Figure 1 , 2 As shown in Figures 3 and 4, in the nano-oil and gas detection method for identifying underground oil and gas reservoirs in arid Gobi areas, step S4 specifically includes the following steps: based on the components and contents of hydrocarbon gases in all hydrocarbon gas collection devices, a contour map of the contents of each component of hydrocarbon gas and total hydrocarbons is drawn, and based on the contour map, an abnormally high value area of ​​each component of hydrocarbon gas and total hydrocarbons is obtained to determine the plane distribution range of the oil and gas reservoir.

[0041] Embodiment 5: As attached Figure 1 , 2 As shown in Figures 3 and 4, in the nano-oil and gas detection method for identifying underground oil and gas reservoirs in arid Gobi areas, step S6 specifically includes the following steps: according to the principle of vertical micro-leakage, the abnormally high value areas of each component of hydrocarbon gas and total hydrocarbons obtained by the hydrocarbon gas collection device are further combined with the seismic exploration data and geological, drilling and other data in the area to determine the shape of the oil and gas reservoir, possible oil and gas-bearing strata and their burial depth.

[0042] Embodiment 6: As attached Figure 5 To Attachment Fig.11 As shown, the technical method, implementation process, detection technology and judgment criteria of the nano oil and gas detection method for identifying underground oil and gas reservoirs in arid Gobi areas have been put into practical use in Tuha Oilfield. The SB area of ​​Tuha Oilfield Company is located in the middle of the Taipei Depression in the Tuha Basin. After years of exploration, Shengbei 3, Shengbei 5, Shengbei 6 and other oil and gas reservoirs or oil and gas wells have been discovered, indicating that the area is rich in oil and gas resources. However, after years of exploration, only a few smaller oil and gas reservoirs have been discovered in the area, and subsequent exploration targets are relatively scarce, and the exploration prospects are unclear. New technical methods are urgently needed to promote the exploration of the area. The experiment on the exploration work in the SB area using the embodiment of the present invention has achieved very good results.

[0043] First, the nanometer high-precision oil and gas detection design scheme was designed. According to the previous exploration work of the oil field in this area, 6 nanometer oil and gas detection lines were designed in this area (see Figure 5 ), the designed oil and gas detection lines pass through the oil and gas reservoirs under development, the discovered oil wells, the oil and gas reservoirs to be developed, and also target the unknown areas that need to be explored.

[0044] According to the design plan, a site survey was conducted. A 1-meter-deep and 3-cm-diameter hole was drilled at the designed point on the surface of the complex alluvial fan with developed gravel using a power drill. A 2.8-cm-diameter hard paper casing that is easy to decompose was buried. A high-precision free hydrocarbon gas collector made of nanomaterials was placed in the casing, and the paper tube mouth was covered with floating soil (see Figure 6 ); After the collector continuously collects free hydrocarbon gas in the formation for 20-30 days, the collector is collected and placed in a numbered sealed can for sealed storage and transported to the laboratory.

[0045] The free hydrocarbon gas samples collected by the high-precision free hydrocarbon gas collector arrive at the laboratory, and the gas chromatograms of different hydrocarbon gas components are tested according to the standard testing process (see Figure 7 ), compared with the standard hydrocarbon gas chromatogram, and integrated to obtain the concentration of different components of different hydrocarbon gas samples and the total hydrocarbon concentration.

[0046] According to the changes in the concentration of different hydrocarbon gas components and the total hydrocarbon concentration, the abnormal high value area and background area of ​​the concentration of each hydrocarbon gas component and the total hydrocarbon concentration are divided to find out the possible oil and gas containing areas; from the results of several nano high-precision oil and gas detection in the SB area, 10 free hydrocarbon gas high value areas can be identified (see Figure 8 ).

[0047] The nature of the underground oil and gas reservoir in the abnormal area is determined by combining the distribution area of ​​each component of the hydrocarbon gas sample spectrum in the abnormal area. The components of the hydrocarbon gas sample spectrum in the SB area are mainly light components below C5 (see Figure 7 ), indicating that the oil and gas reservoirs in this area are mainly gas reservoirs or condensate oil and gas reservoirs.

[0048] The results of nano-high-precision oil and gas detection were compared with the drilling results. The oil and gas detection results corresponding to the discovered oil and gas reservoirs and oil and gas wells were all abnormally high-value areas. At the same time, among dozens of undrilled traps, 8 possible oil-bearing targets in different strata were found in the abnormally high-value areas of oil and gas detection (see Fig. 9 , Fig.10 , Fig.11 ).

[0049] It can be seen from the above application cases that the present invention can quickly, efficiently, economically and accurately discover exploration targets and provide drilling well locations. 2The application of nano high-precision oil and gas detection technology in the exploration area took less than 3 months from design, on-site construction, experimental detection, data analysis to comprehensive seismic geological research to find the exploration target; the detection results are consistent with the results of the wells that have been drilled, and the abnormal high-value areas have a good correspondence with the discovered oil and gas reservoirs or oil and gas wells that have produced oil and gas. The drilling wells corresponding to the background area have no oil and gas discoveries; and the undrilled oil and gas abnormal areas all correspond to new closures that have not been drilled. Therefore, nano high-precision oil and gas detection technology can identify oil and gas reservoirs with high accuracy, greatly improve the success rate of oil and gas exploration, and significantly reduce the cost of oil and gas exploration.

[0050] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A nano oil and gas detection method for identifying underground oil and gas reservoirs in arid Gobi areas, characterized in that The following steps are involved: Step S1: preparing a hydrocarbon gas collection device using nano polymer alloy material; Step S2: using the hydrocarbon gas collection device prepared in step S1 to obtain soil free hydrocarbon gas samples at each designed sampling point; Step S3: According to the soil free hydrocarbon gas samples at each sampling point, the content values ​​of each component of the captured hydrocarbon gas and the total hydrocarbon gas content value are measured in the laboratory; Step S4: according to the values ​​of each component and total hydrocarbon content of hydrocarbon gas at each sample collection point, a corresponding plane contour map is drawn to delineate the areas with abnormally high values ​​of each component and total hydrocarbon content of hydrocarbon gas, so as to delineate the plane distribution range of oil and gas reservoirs; Step S5: determining the type of oil and gas reservoir according to the sample spectrum characteristics measured by the sample laboratory in the abnormally high value area, wherein the oil and gas reservoir type includes oil reservoir, gas reservoir or oil and gas reservoir; Step S6: Determine the shape of the oil and gas reservoir, possible oil and gas-bearing strata and their burial depth by combining the seismic exploration data and geological and drilling data in the region.

2. The nano oil and gas detection method for identifying underground oil and gas reservoirs in arid Gobi areas according to claim 1 is characterized in that In step S1, a hydrocarbon gas collection device is prepared using different types of nano-polymer alloy materials.

3. The nano oil and gas detection method for identifying underground oil and gas reservoirs in arid Gobi areas according to claim 1 or 2, characterized in that Step S2 specifically includes the following steps: drilling a hole on the ground surface at each designed sampling point, placing a hydrocarbon gas collection device made of nano-polymer alloy material, and then restoring the soil; after a certain interval, taking out the nano-hydrocarbon gas collection device at each sampling point and putting it into a sealed bottle.

4. The nano oil and gas detection method for identifying underground oil and gas reservoirs in arid Gobi areas according to claim 1 or 2, characterized in that Step S3 specifically includes the following steps: desorbing hydrocarbon gas from each recovered hydrocarbon gas collection device according to the procedure; extracting gas from each sealed bottle, analyzing the obtained hydrocarbon gas components using a universal detection instrument, and obtaining the types and contents of hydrocarbon gas in all hydrocarbon gas collection devices.

5. The nano oil and gas detection method for identifying underground oil and gas reservoirs in arid Gobi areas according to claim 3 is characterized in that Step S3 specifically includes the following steps: desorbing hydrocarbon gas from each recovered hydrocarbon gas collection device according to the procedure; extracting gas from each sealed bottle, analyzing the obtained hydrocarbon gas components using a universal detection instrument, and obtaining the types and contents of hydrocarbon gas in all hydrocarbon gas collection devices.

6. The nano oil and gas detection method for identifying underground oil and gas reservoirs in arid Gobi areas according to claim 1, 2 or 5, characterized in that Step S4 specifically includes the following steps: based on the components and contents of hydrocarbon gases in all hydrocarbon gas collection devices, draw contour maps of the contents of each component of hydrocarbon gas and total hydrocarbons, obtain abnormally high value areas of each component of hydrocarbon gas and total hydrocarbons based on the contour maps, and determine the plane distribution range of the oil and gas reservoir.

7. The nano oil and gas detection method for identifying underground oil and gas reservoirs in arid Gobi areas according to claim 3 is characterized in that Step S4 specifically includes the following steps: based on the components and contents of hydrocarbon gases in all hydrocarbon gas collection devices, draw contour maps of the contents of each component of hydrocarbon gas and total hydrocarbons, obtain abnormally high value areas of each component of hydrocarbon gas and total hydrocarbons based on the contour maps, and determine the plane distribution range of the oil and gas reservoir.

8. The nano oil and gas detection method for identifying underground oil and gas reservoirs in arid Gobi areas according to claim 4, characterized in that Step S4 specifically includes the following steps: based on the components and contents of hydrocarbon gases in all hydrocarbon gas collection devices, draw contour maps of the contents of each component of hydrocarbon gas and total hydrocarbons, obtain abnormally high value areas of each component of hydrocarbon gas and total hydrocarbons based on the contour maps, and determine the plane distribution range of the oil and gas reservoir.

9. The nano oil and gas detection method for identifying underground oil and gas reservoirs in arid Gobi areas according to claim 1, 2, 5, 7 or 8, characterized in that Step S6 specifically includes the following steps: according to the principle of vertical micro-leakage, the abnormally high value areas of hydrocarbon gas components and total hydrocarbons obtained by the hydrocarbon gas collection device are further combined with the seismic exploration data and geological and drilling data in the area to determine the shape of the oil and gas reservoir, possible oil and gas-bearing strata and their burial depth.

10. The nano oil and gas detection method for identifying underground oil and gas reservoirs in arid Gobi areas according to claim 3, characterized in that Step S6 specifically includes the following steps: according to the principle of vertical micro-leakage, the abnormally high value areas of hydrocarbon gas components and total hydrocarbons obtained by the hydrocarbon gas collection device are further combined with the seismic exploration data and geological and drilling data in the area to determine the shape of the oil and gas reservoir, possible oil and gas-bearing strata and their burial depth.

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