CN110412144B - Method for determining maturity of hydrocarbon source rock - Google Patents
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Abstract
The invention provides a method for determining the maturity of a hydrocarbon source rock, wherein the method comprises the following steps: (1) identifying and quantitatively analyzing the ethylnoramantadine compounds in the asphalt sample extracted from the source rock sample by using a full-two-dimensional gas chromatography-time-of-flight mass spectrometer; (2) obtaining the relative content of the ethyl substituted ethyl noradamantane in the ethyl noradamantane compounds according to the identification and quantitative analysis results obtained in the step (1); (3) and (3) comparing the relative content obtained in the step (2) with the relative content of the ethyl noramantadine substituted by ethyl in the ethyl noramantadine compounds in the source rock sample with known maturity, and determining the maturity of the target source rock. The method can be used for quantitatively determining the maturity of the hydrocarbon source rock, has low dependence on personal experience, and can judge the maturity of the hydrocarbon source rock more accurately.
Description
Technical Field
The invention relates to a method for determining the maturity of a source rock, in particular to a method for determining the maturity of the source rock by using an ethylnordiamantane compound.
Background
Source rocks include source rocks, source rocks and source rocks, traditionally commonly referred to as petrogenic rocks. French petrogeologist Tissot (1978) et al define the source rock as: the rock is rich in organic matters, generates a large amount of oil gas and discharges the oil gas. A source rock is a rock that is capable of producing or has produced hydrocarbons.
The conditions that the source rock should have: contains a large amount of organic matters, namely kerogen, and reaches the threshold temperature for kerogen to be converted into oil gas, namely the burial depth (see: Tanza, Nakayao, Lufuliang, Wangxin, Wujing, Luyintao, Source rock logging response characteristics and an identification evaluation method [ J ], gas geoscience, 2013, (02): 414-.
At present, indexes such as organic matter abundance, organic matter type and organic matter maturity of the hydrocarbon source rock are mostly adopted in the field to evaluate the hydrocarbon source rock, wherein the organic matter maturity of the hydrocarbon source rock is the most common index, so that the determination of the maturity of the hydrocarbon source rock is one of the bases of oil and gas exploration.
Disclosure of Invention
To address the above-described shortcomings and drawbacks, it is an object of the present invention to provide a method for determining the maturity of a source rock.
In order to achieve the above object, the present invention provides a method for determining the maturity of a source rock, wherein the method for determining the maturity of the source rock comprises:
(1) identifying and quantitatively analyzing the ethylnoramantadine compounds in the asphalt sample extracted from the source rock sample by using a full-two-dimensional gas chromatography-time-of-flight mass spectrometer;
(2) obtaining the relative content of the ethyl substituted ethyl noradamantane in the ethyl noradamantane compounds according to the identification and quantitative analysis results obtained in the step (1);
(3) and (3) comparing the relative content obtained in the step (2) with the relative content of the ethyl noramantadine substituted by ethyl in the ethyl noramantadine compounds in the source rock sample with known maturity, and determining the maturity of the target source rock.
According to a specific embodiment of the present invention, in the step (1), the process of detecting the mixed solution by using the comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometer is a conventional technical means in the art, and a person skilled in the art can also reasonably set specific parameters involved in the detection process according to the needs of field operation as long as the object of the present invention can be achieved, wherein the specific process of detection and the process of identifying the ethyl noradamantane compound in the asphalt can be seen in: 1) hala, s.; landa, s.; hanus, V.∨Angew.chem., int.ed.engl.1966,5,1045-1046.2) Farcasiu, d.; wiskott, e.; osawa, e.; thielecke, w.; engler, e.m.; slutsky, j.; schleyer, p.v.r.; kent, g.j.j.am.chem.soc.1974,96,4669-4671.3) Osawa, e.; engler, e.m.; godleski, s.a.; inamoto, y.; kent, g.j.; kausch, m.; schleyer, P.v.R.J.org.chem.1980,45, 984-.
According to a specific embodiment of the present invention, in the step (1), the comprehensive two-dimensional gas chromatography-time of flight mass spectrometer (GC × GC-TOF MS) is a conventional apparatus used in the art, and in the specific embodiment of the present invention, the comprehensive two-dimensional gas chromatography-time of flight mass spectrometer is a comprehensive two-dimensional gas chromatography-time of flight mass spectrometer manufactured by Leco corporation, usa.
According to a specific embodiment of the present invention, preferably, the method further comprises, before step (1): d 16-adamantane was added to a sample of the asphalt extracted from the source rock sample and diluted to a desired concentration using a solvent to obtain a mixed solution.
According to a particular embodiment of the present invention, preferably, the method further comprises, before step (1): taking 50-200mg of asphalt sample extracted from a hydrocarbon source rock sample, adding 30-50 mu L of D16-adamantane (D16-adamantane, deuterated adamantane) with the concentration of 0.25-0.75 mu g/mu L into the asphalt sample, adding a solvent to 1.0-2.0mL, and uniformly mixing for later use.
According to a particular embodiment of the invention, in the process, preferably, the solvent is dichloromethane.
In an embodiment of the present invention, the method for determining the maturity of the source rock further specifically comprises, before step (1):
taking 50-200mg of asphalt sample extracted from a hydrocarbon source rock sample, adding 40 mu L of d 16-adamantane with the concentration of 0.5 mu g/mu L into the asphalt sample, adding dichloromethane to 1.5mL, and uniformly mixing for later use.
According to a particular embodiment of the invention, in the method, preferably, the extraction of the bitumen sample from the source rock sample comprises in particular the following steps:
soxhlet extracting hydrocarbon source rock sample powder by using a mixed solution of trichloromethane and methanol, and obtaining an extraction solution after extracting for a period of time;
after evaporating the organic solvent in the extraction solution under a nitrogen stream, a sample of pitch was obtained.
According to a specific embodiment of the present invention, in the method, preferably, the volume ratio of chloroform to methanol in the mixed solution of chloroform and methanol is 95:5-99: 1.
According to a particular embodiment of the invention, in said process, preferably, said extraction time is comprised between 24 and 48 h.
According to a particular embodiment of the invention, in the method, preferably, the source rock sample has a Ro (vitrinite reflectance) of 0.1 to 5.0.
According to a specific embodiment of the present invention, in the method, preferably, the source rock sample comprises mudstone, coal rock, shale or carbonate rock.
According to a specific embodiment of the present invention, in the method, preferably, the ethyl-substituted ethyl noradamantane comprises a group consisting of ethyl-substituted ethyl noradamantane detectable by a full two-dimensional gas chromatography-time-of-flight mass spectrometer.
According to a specific embodiment of the present invention, in the method, the ethylnoradamantane compound is a conventional substance, and includes single-cage ethylnoradamantane (shown in the following formula 1), double-cage ethylnoradamantane (shown in the following formula 2), and triple-cage ethylnoradamantane (shown in the following formula 3).
The IUPAC name of the single-cage ethylnoradamantane is (1R, 3aS, 4R, 6R, 7ar, 9S) -octahydro-1H-4, 1, 6- (epiprose [1,2,3] triyl) indene.
According to a particular embodiment of the invention, in the method, preferably, the ethyl-substituted ethylnoradamantane is ethyl-substituted single-cage ethylnoradamantane.
According to a specific embodiment of the present invention, in the method, preferably, the ethyl-substituted single-cage ethyl noradamantane includes one or a combination of several of 1-ethyl-substituted ethyl noradamantane, 2-ethyl-substituted ethyl noradamantane, 3-ethyl-substituted ethyl noradamantane, 4-ethyl-substituted ethyl noradamantane, 5-ethyl-substituted ethyl noradamantane, 6-ethyl-substituted ethyl noradamantane, 7-ethyl-substituted ethyl noradamantane, 8-ethyl-substituted ethyl noradamantane, 9-ethyl-substituted ethyl noradamantane and 10-ethyl-substituted ethyl noradamantane.
The method for determining the maturity of the source rock can be used for quantitatively determining the maturity of the source rock, has low dependence on personal experience, and is accurate in judgment of the maturity of the source rock.
Detailed Description
In order to clearly understand the technical features, objects and advantages of the present invention, the following detailed description of the technical solutions of the present invention will be made with reference to the following specific examples, which should not be construed as limiting the implementable scope of the present invention.
Example 1
The embodiment provides a method for determining the maturity of a hydrocarbon source rock by using an ethylnordiamantane compound, wherein the method comprises the following steps:
extracting a bitumen sample from a mudstone hydrocarbon source rock sample:
firstly, performing Soxhlet extraction on the powder of the hydrocarbon source rock sample A for 24 hours by using a mixed solution of chloroform and methanol (the volume ratio of the chloroform to the methanol is 98:2) to obtain an extraction solution.
After careful evaporation of the organic solvent in the extracted solution under a stream of nitrogen, a sample of source rock bitumen was obtained.
200mg of asphalt sample is taken, 40 mu L of d 16-adamantane with the concentration of 0.5 mu g/mu L is added into the asphalt sample, dichloromethane is added to the asphalt sample until the volume is 1.5mL, and the mixture is uniformly mixed for later use.
And detecting the mixed solution obtained after the uniform mixing by using a full two-dimensional gas chromatography-time of flight mass spectrometer (GC x GC-TOF MS) so as to identify and quantitatively analyze the ethylnoradamantane compounds in the asphalt.
From the above-obtained identification and quantitative analysis results, the relative content of ethyl-substituted ethylnoradamantane in ethylnoradamantane-based compounds, in this example, 10.8 wt%, was obtained.
In this embodiment, the ethyl substituted ethyl noradamantane includes a group of ethyl substituted ethyl noradamantanes detectable by an all-two-dimensional gas chromatography-time-of-flight mass spectrometer.
Specifically, the ethyl substituted ethyl noradamantane is ethyl substituted single cage ethyl noradamantane, which comprises one or more of 1-ethyl substituted single cage ethyl noradamantane, 2-ethyl substituted single cage ethyl noradamantane, 3-ethyl substituted single cage ethyl noradamantane, 4-ethyl substituted single cage ethyl noradamantane, 5-ethyl substituted single cage ethyl noradamantane, 6-ethyl substituted single cage ethyl noradamantane, 7-ethyl substituted single cage ethyl noradamantane, 8-ethyl substituted single cage ethyl noradamantane, 9-ethyl substituted single cage ethyl noradamantane and 10-ethyl substituted single cage ethyl noradamantane.
The relative content obtained above is compared with the relative content of ethyl-substituted ethyl noradamantane in ethyl noradamantane compounds (as shown in table 1) in a source rock sample with known maturity, and the maturity of the target source rock is determined, in this example, the Ro of the source rock sample is determined to be 0.2.
TABLE 1
Example 2
The embodiment provides a method for determining the maturity of a hydrocarbon source rock by using an ethylnordiamantane compound, wherein the method comprises the following steps:
extracting a bitumen sample from a mudstone hydrocarbon source rock sample:
firstly, the powder of the source rock sample B is subjected to Soxhlet extraction for 24 hours by using a mixed solution of trichloromethane and methanol (the volume ratio of the trichloromethane to the methanol is 97:2), so as to obtain an extraction solution.
After careful evaporation of the organic solvent in the extracted solution under a stream of nitrogen, a sample of source rock bitumen was obtained.
100mg of asphalt sample is taken, 40 mu L of d 16-adamantane with the concentration of 0.5 mu g/mu L is added into the asphalt sample, dichloromethane is added to the asphalt sample until the volume is 1.5mL, and the mixture is uniformly mixed for later use.
And detecting the mixed solution obtained after the uniform mixing by using a full two-dimensional gas chromatography-time of flight mass spectrometer (GC x GC-TOF MS) so as to identify and quantitatively analyze the ethylnoradamantane compounds in the asphalt.
From the above-obtained identification and quantitative analysis results, the relative content of ethyl-substituted ethylnoradamantane in ethylnoradamantane-based compounds, in this example, 8.59 wt%, was obtained.
In this embodiment, the ethyl substituted ethyl noradamantane includes a group of ethyl substituted ethyl noradamantanes detectable by an all-two-dimensional gas chromatography-time-of-flight mass spectrometer.
Specifically, the ethyl substituted ethyl noradamantane is ethyl substituted single cage ethyl noradamantane, which comprises one or more of 1-ethyl substituted single cage ethyl noradamantane, 2-ethyl substituted single cage ethyl noradamantane, 3-ethyl substituted single cage ethyl noradamantane, 4-ethyl substituted single cage ethyl noradamantane, 5-ethyl substituted single cage ethyl noradamantane, 6-ethyl substituted single cage ethyl noradamantane, 7-ethyl substituted single cage ethyl noradamantane, 8-ethyl substituted single cage ethyl noradamantane, 9-ethyl substituted single cage ethyl noradamantane and 10-ethyl substituted single cage ethyl noradamantane.
The relative content obtained above was compared with the relative content of ethyl-substituted ethyl noradamantane in ethyl noradamantane compounds (as shown in table 1) in a source rock sample of known maturity to determine the maturity of the target source rock, in this example, the Ro of the source rock sample was determined to be 1.3.
Example 3
The embodiment provides a method for determining the maturity of a hydrocarbon source rock by using an ethylnordiamantane compound, wherein the method comprises the following steps:
extracting a bitumen sample from a mudstone hydrocarbon source rock sample:
firstly, performing Soxhlet extraction on the powder of the hydrocarbon source rock sample C for 24 hours by using a mixed solution of chloroform and methanol (the volume ratio of the chloroform to the methanol is 98:2) to obtain an extraction solution.
After careful evaporation of the organic solvent in the extracted solution under a stream of nitrogen, a sample of source rock bitumen was obtained.
50mg of asphalt sample is taken, 40 mu L of d 16-adamantane with the concentration of 0.5 mu g/mu L is added into the asphalt sample, and dichloromethane is added to 1.5mL and is uniformly mixed for later use.
And detecting the mixed solution obtained after the uniform mixing by using a full two-dimensional gas chromatography-time of flight mass spectrometer (GC x GC-TOF MS) so as to identify and quantitatively analyze the ethylnoradamantane compounds in the asphalt.
From the above-obtained identification and quantitative analysis results, the relative content of ethyl-substituted ethylnoradamantane in ethylnoradamantane-based compounds, in this example, 6.42 wt%, was obtained.
In this embodiment, the ethyl substituted ethyl noradamantane includes a group of ethyl substituted ethyl noradamantanes detectable by an all-two-dimensional gas chromatography-time-of-flight mass spectrometer.
Specifically, the ethyl substituted ethyl noradamantane is ethyl substituted single cage ethyl noradamantane, which comprises one or more of 1-ethyl substituted single cage ethyl noradamantane, 2-ethyl substituted single cage ethyl noradamantane, 3-ethyl substituted single cage ethyl noradamantane, 4-ethyl substituted single cage ethyl noradamantane, 5-ethyl substituted single cage ethyl noradamantane, 6-ethyl substituted single cage ethyl noradamantane, 7-ethyl substituted single cage ethyl noradamantane, 8-ethyl substituted single cage ethyl noradamantane, 9-ethyl substituted single cage ethyl noradamantane and 10-ethyl substituted single cage ethyl noradamantane.
The relative content obtained above was compared with the relative content of ethyl-substituted ethyl noradamantane in ethyl noradamantane compounds (as shown in table 1) in a source rock sample of known maturity to determine the maturity of the target source rock, which in this example was determined to have a Ro of 2.3.
Example 4
The embodiment provides a method for determining the maturity of a hydrocarbon source rock by using an ethylnordiamantane compound, wherein the method comprises the following steps:
extracting a bitumen sample from a mudstone hydrocarbon source rock sample:
firstly, performing Soxhlet extraction on the powder of the hydrocarbon source rock sample D for 24 hours by using a mixed solution of chloroform and methanol (the volume ratio of the chloroform to the methanol is 98:2) to obtain an extraction solution.
After careful evaporation of the organic solvent in the extracted solution under a stream of nitrogen, a sample of source rock bitumen was obtained.
200mg of asphalt sample is taken, 40 mu L of d 16-adamantane with the concentration of 0.5 mu g/mu L is added into the asphalt sample, dichloromethane is added to the asphalt sample until the volume is 1.5mL, and the mixture is uniformly mixed for later use.
And detecting the mixed solution obtained after the uniform mixing by using a full two-dimensional gas chromatography-time of flight mass spectrometer (GC x GC-TOF MS) so as to identify and quantitatively analyze the ethylnoradamantane compounds in the asphalt.
From the above-obtained identification and quantitative analysis results, the relative content of ethyl-substituted ethylnoradamantane in ethylnoradamantane-based compounds, which in this example was 3.59% by weight, was obtained.
In this embodiment, the ethyl substituted ethyl noradamantane includes a group of ethyl substituted ethyl noradamantanes detectable by an all-two-dimensional gas chromatography-time-of-flight mass spectrometer.
Specifically, the ethyl substituted ethyl noradamantane is ethyl substituted single cage ethyl noradamantane, which comprises one or more of 1-ethyl substituted single cage ethyl noradamantane, 2-ethyl substituted single cage ethyl noradamantane, 3-ethyl substituted single cage ethyl noradamantane, 4-ethyl substituted single cage ethyl noradamantane, 5-ethyl substituted single cage ethyl noradamantane, 6-ethyl substituted single cage ethyl noradamantane, 7-ethyl substituted single cage ethyl noradamantane, 8-ethyl substituted single cage ethyl noradamantane, 9-ethyl substituted single cage ethyl noradamantane and 10-ethyl substituted single cage ethyl noradamantane.
The relative content obtained above was compared with the relative content of ethyl-substituted ethyl noradamantane in ethyl noradamantane compounds (as shown in table 1) in a source rock sample of known maturity to determine the maturity of the target source rock, which in this example was determined to have a Ro of 3.6.
Example 5
The embodiment provides a method for determining the maturity of a hydrocarbon source rock by using an ethylnordiamantane compound, wherein the method comprises the following steps:
extracting a bitumen sample from a mudstone hydrocarbon source rock sample:
firstly, the powder of the source rock sample E is subjected to Soxhlet extraction for 24 hours by using a mixed solution of trichloromethane and methanol (the volume ratio of the trichloromethane to the methanol is 97:2), so as to obtain an extraction solution.
After careful evaporation of the organic solvent in the extracted solution under a stream of nitrogen, a sample of source rock bitumen was obtained.
100mg of asphalt sample is taken, 40 mu L of d 16-adamantane with the concentration of 0.5 mu g/mu L is added into the asphalt sample, dichloromethane is added to the asphalt sample until the volume is 1.5mL, and the mixture is uniformly mixed for later use.
And detecting the mixed solution obtained after the uniform mixing by using a full two-dimensional gas chromatography-time of flight mass spectrometer (GC x GC-TOF MS) so as to identify and quantitatively analyze the ethylnoradamantane compounds in the asphalt.
From the above-obtained identification and quantitative analysis results, the relative content of ethyl-substituted ethylnoradamantane in ethylnoradamantane-based compounds, which in this example was 1.45 wt%, was obtained.
In this embodiment, the ethyl substituted ethyl noradamantane includes a group of ethyl substituted ethyl noradamantanes detectable by an all-two-dimensional gas chromatography-time-of-flight mass spectrometer.
Specifically, the ethyl substituted ethyl noradamantane is ethyl substituted single cage ethyl noradamantane, which comprises one or more of 1-ethyl substituted single cage ethyl noradamantane, 2-ethyl substituted single cage ethyl noradamantane, 3-ethyl substituted single cage ethyl noradamantane, 4-ethyl substituted single cage ethyl noradamantane, 5-ethyl substituted single cage ethyl noradamantane, 6-ethyl substituted single cage ethyl noradamantane, 7-ethyl substituted single cage ethyl noradamantane, 8-ethyl substituted single cage ethyl noradamantane, 9-ethyl substituted single cage ethyl noradamantane and 10-ethyl substituted single cage ethyl noradamantane.
The relative content obtained above was compared with the relative content of ethyl-substituted ethyl noradamantane in ethyl noradamantane compounds (as shown in table 1) in a source rock sample of known maturity to determine the maturity of the target source rock, which in this example was determined to have a Ro of 4.5.
Example 6
The embodiment provides a method for determining the maturity of a hydrocarbon source rock by using an ethylnordiamantane compound, wherein the method comprises the following steps:
extracting a bitumen sample from a mudstone hydrocarbon source rock sample:
firstly, performing Soxhlet extraction on powder of a hydrocarbon source rock sample F for 24 hours by using a mixed solution of chloroform and methanol (the volume ratio of the chloroform to the methanol is 98:2) to obtain an extraction solution.
After careful evaporation of the organic solvent in the extracted solution under a stream of nitrogen, a sample of source rock bitumen was obtained.
50mg of asphalt sample is taken, 40 mu L of d 16-adamantane with the concentration of 0.5 mu g/mu L is added into the asphalt sample, and dichloromethane is added to 1.5mL and is uniformly mixed for later use.
And detecting the mixed solution obtained after the uniform mixing by using a full two-dimensional gas chromatography-time of flight mass spectrometer (GC x GC-TOF MS) so as to identify and quantitatively analyze the ethylnoradamantane compounds in the asphalt.
From the above-obtained identification and quantitative analysis results, the relative content of ethyl-substituted ethylnoradamantane in ethylnoradamantane-based compounds, in this example, 0.77 wt%, was obtained.
In this embodiment, the ethyl substituted ethyl noradamantane includes a group of ethyl substituted ethyl noradamantanes detectable by an all-two-dimensional gas chromatography-time-of-flight mass spectrometer.
Specifically, the ethyl substituted ethyl noradamantane is ethyl substituted single cage ethyl noradamantane, which comprises one or more of 1-ethyl substituted single cage ethyl noradamantane, 2-ethyl substituted single cage ethyl noradamantane, 3-ethyl substituted single cage ethyl noradamantane, 4-ethyl substituted single cage ethyl noradamantane, 5-ethyl substituted single cage ethyl noradamantane, 6-ethyl substituted single cage ethyl noradamantane, 7-ethyl substituted single cage ethyl noradamantane, 8-ethyl substituted single cage ethyl noradamantane, 9-ethyl substituted single cage ethyl noradamantane and 10-ethyl substituted single cage ethyl noradamantane.
The relative content obtained above was compared with the relative content of ethyl-substituted ethyl noradamantane in ethyl noradamantane compounds (as shown in table 1) in a source rock sample of known maturity to determine the maturity of the target source rock, which in this example was determined to have a Ro of 4.9.
Therefore, the method for determining the maturity of the source rock can be used for quantitatively determining the maturity of the source rock, the dependence degree of the method on personal experience is low, and the maturity of the source rock is accurately judged.
The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features and the technical inventions of the present invention, the technical features and the technical inventions, and the technical inventions can be freely combined and used.
Claims (8)
1. A method for determining the maturity of a source rock, the method comprising:
(1) soxhlet extracting hydrocarbon source rock sample powder for 24-48h by using a mixed solution of chloroform and methanol with a volume ratio of 95:5-99:1 to obtain an extraction solution, and evaporating an organic solvent in the extraction solution under a nitrogen flow to obtain the productTo a bitumen sample; taking a bitumen sample extracted from a hydrocarbon source rock sample, adding the bitumen sampled16-adamantane, adding dichloromethane, and uniformly mixing; detecting the mixed solution obtained after uniform mixing by using a full-two-dimensional gas chromatography-time-of-flight mass spectrometer so as to identify and quantitatively analyze the ethylnoradamantane compounds in the asphalt sample;
(2) obtaining the relative content of the ethyl substituted ethyl noradamantane in the ethyl noradamantane compounds according to the identification and quantitative analysis results obtained in the step (1);
(3) and (3) comparing the relative content obtained in the step (2) with the relative content of the ethyl noramantadine substituted by ethyl in the ethyl noramantadine compounds in the source rock sample with known maturity, and determining the maturity of the target source rock.
2. The method according to claim 1, wherein step (1) comprises in particular: taking 50-200mg of asphalt sample extracted from source rock sample, and adding 0.25-0.75 μ g/μ L of asphalt sampled30-50 mu L of 16-adamantane, adding dichloromethane to 1.0-2.0mL, and uniformly mixing for later use.
3. The method of claim 1 or 2, wherein the source rock sample has a Ro of 0.1 to 5.0.
4. The method of claim 1 or 2, wherein the source rock sample comprises mudstone, coal rock, shale, or carbonate rock.
5. The method of claim 3, wherein the source rock sample comprises coal rock, shale, or carbonate rock.
6. The method of claim 1 or 2, wherein the ethyl-substituted ethyl noradamantane comprises the group consisting of ethyl-substituted ethyl noradamantane detectable by a full two-dimensional gas chromatography-time-of-flight mass spectrometer.
7. The method of claim 6, wherein the ethyl-substituted ethylnoradamantane is ethyl-substituted single-cage ethylnoradamantane.
8. The method of claim 7, wherein the ethyl-substituted mono-caged ethyl noradamantane comprises one or a combination of 1-ethyl-substituted mono-caged ethyl noradamantane, 2-ethyl-substituted mono-caged ethyl noradamantane, 3-ethyl-substituted mono-caged ethyl noradamantane, 4-ethyl-substituted mono-caged ethyl noradamantane, 5-ethyl-substituted mono-caged ethyl noradamantane, 6-ethyl-substituted mono-caged ethyl noradamantane, 7-ethyl-substituted mono-caged ethyl noradamantane, 8-ethyl-substituted mono-caged ethyl noradamantane, 9-ethyl-substituted mono-caged ethyl noradamantane, and 10-ethyl-substituted mono-caged ethyl noradamantane.
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