CN115356463A - Method for judging whether substrate granite supplies helium to helium-rich natural gas reservoir - Google Patents
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- 239000001307 helium Substances 0.000 title claims abstract description 167
- 229910052734 helium Inorganic materials 0.000 title claims abstract description 167
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 title claims abstract description 167
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 158
- 239000003345 natural gas Substances 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000010438 granite Substances 0.000 title claims abstract description 31
- 239000000758 substrate Substances 0.000 title claims abstract description 11
- 239000011435 rock Substances 0.000 claims abstract description 73
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 239000003814 drug Substances 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 239000013049 sediment Substances 0.000 claims abstract description 5
- 229910052751 metal Inorganic materials 0.000 claims description 17
- 239000002184 metal Substances 0.000 claims description 17
- 229910052770 Uranium Inorganic materials 0.000 claims description 10
- ZSLUVFAKFWKJRC-IGMARMGPSA-N 232Th Chemical compound [232Th] ZSLUVFAKFWKJRC-IGMARMGPSA-N 0.000 claims description 9
- 229910052776 Thorium Inorganic materials 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- 238000005755 formation reaction Methods 0.000 claims description 9
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 claims description 9
- 238000011160 research Methods 0.000 claims description 8
- 238000004590 computer program Methods 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 5
- 238000001095 inductively coupled plasma mass spectrometry Methods 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 claims description 3
- 238000009529 body temperature measurement Methods 0.000 claims description 3
- 238000012937 correction Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000008021 deposition Effects 0.000 claims description 2
- 238000009933 burial Methods 0.000 claims 1
- 238000011065 in-situ storage Methods 0.000 abstract description 7
- -1 underburden Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 12
- 238000012850 discrimination method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- RZVAJINKPMORJF-UHFFFAOYSA-N Acetaminophen Chemical compound CC(=O)NC1=CC=C(O)C=C1 RZVAJINKPMORJF-UHFFFAOYSA-N 0.000 description 1
- 241001291455 Cliona Species 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 230000005258 radioactive decay Effects 0.000 description 1
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Abstract
The invention discloses a method for judging whether a substrate granite supplies helium to a helium-rich natural gas reservoir. The method comprises the following steps: collecting representative reservoir rock, underburden, and helium-rich natural gas samples in a basin of a study area; determining the amount of helium production from the reservoir rock and the underlying deposit; measuring the average concentration of helium in the helium-rich natural gas sample to obtain the content of helium in the helium-rich natural gas reservoir; comparing the helium production of the reservoir rock and the underlying sediment layer with the helium content of the helium-rich natural gas reservoir, whether the bottom granite contributes to the helium source of the helium-rich natural gas reservoir can be judged: 1) If it is 4 He Raw material ≥ 4 He Tibetan medicine Time, it shows that the base granite has a limited contribution to the helium source of the helium-rich natural gas reservoir; 2) If it is 4 He Raw material < 4 He Tibetan medicine It is shown that the base granite contributes significantly to the helium source of the helium-rich natural gas reservoir. The invention compares the in-situ helium generation quantity of the reservoir withThe amount of helium produced by the underburden and the helium content of the helium-rich natural gas reservoir effectively determine the helium source contribution of the base granite to the helium-rich natural gas reservoir.
Description
Technical Field
The invention relates to a method for judging whether a substrate granite supplies helium to a helium-rich natural gas reservoir, belonging to the technical field of resource exploration.
Background
Helium has special physical-chemical properties, particularly the characteristic of being liquid at ultralow temperature and chemical inertness, so that helium becomes an irreplaceable, important and scarce strategic resource for the development of national security and high and new technology industries. At present, helium gas extraction from helium-containing and helium-rich natural gas reservoirs is still the only way for industrial helium production. The research of the helium source is one of key research contents in helium resource exploration, and the research of the helium source not only can provide theoretical basis and support for establishment of a helium gas reservoir mechanism, but also can provide key evidence and understanding for prediction of a helium-rich natural gas reservoir. Typically, sources of helium include shell source helium (basin-based granite and organic-rich shale), mantle source helium, and atmospheric source helium. Most of the helium in helium-rich natural gas reservoirs reported worldwide are dominated by shell source helium, and ancient basin-based granite is the predominant helium source rock. Therefore, how to judge whether the base granite has helium source contribution to the helium-rich natural gas reservoir is a problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a method for judging whether a base granite has a helium source contribution to a helium-rich natural gas reservoir, which can be used for determining the composition of helium sources in the natural gas reservoir and particularly determining whether a basin base granite has the helium source contribution to the natural gas reservoir.
The method for judging whether the substrate granite supplies helium to the helium-rich natural gas reservoir or not comprises the following steps:
s1, collecting representative reservoir rock, an underlying sedimentary stratum and a helium-rich natural gas sample in a basin of a research area;
s2, measuring the helium production amount of the reservoir rock and the underlying sedimentary stratum;
s3, measuring the average concentration of helium in the helium-rich natural gas sample, and obtaining the content of helium in the helium-rich natural gas reservoir according to the natural gas reserve of the helium-rich natural gas reservoir;
s4, comparing the helium generation amount of the reservoir rock and the helium generation amount of the underlying sedimentary stratum with the helium content of the helium-enriched natural gas reservoir, namely judging whether the underlying granite contributes to the helium source of the helium-enriched natural gas reservoir:
1) If it is 4 He Raw material ≥ 4 He Tibetan medicine Time, it is shown that the base granite contributes to the helium source of the helium-rich natural gas reservoirLimiting;
2) If it is 4 He Raw material < 4 He Tibetan medicine The method comprises the steps of firstly, obtaining a ratio of the helium source of the substrate granite to the helium source of the helium-rich natural gas reservoir;
wherein the content of the first and second substances, 4 He raw material Representing a sum of the amounts of helium produced by the reservoir rock and the underlying sedimentary formations; 4 He tibetan medicine Indicating the helium content of the helium-rich natural gas reservoir.
In the above method, in step S2, the helium production amounts of the reservoir rock and the underlying sedimentary layer are obtained according to equations (1) and (2), respectively:
wherein, the first and the second end of the pipe are connected with each other, 4 He store up Representing the amount of helium production, α, of said reservoir rock Store up Expressed per gram of said reservoir rock 4 Annual yield of He,. Rho Store up Representing the average density of the reservoir rock,
represents the average porosity, V, of the reservoir rock Store up Representing the volume of the reservoir rock, and t representing the time of formation of the helium-rich natural gas reservoir;
4 He sink with a hole Represents the amount of helium, alpha, of the underlying deposition layer Sink with a hole Expressed as grams of the underlying deposited layer 4 Annual yield of He,. Rho Sink with a metal plate Represents the average density of the underlying deposited layer,
represents the average porosity, V, of the underlying deposited layer Sink with a metal plate Representing the volume of the underlying deposited layer.
In the above method, a rock density tester is used to determine the density of the reservoir rock and the underlying sedimentary layers: taking a small rock sample, placing the small rock sample on a rock density tester, and reading a rock density numerical value after the small rock sample is stabilized;
the average density is an average of the densities of 5 to 10 samples.
In the above method, a rock porosity tester is used to measure the porosity of the reservoir rock and the underlying sedimentary layer;
the porosity is the average of the porosities of 5 to 10 samples.
In the above method, the trapped area of the helium-rich natural gas reservoir is multiplied by the thickness of the reservoir rock and the underlying sediment layer to obtain the volume of the reservoir rock and the underlying sediment layer below the gas reservoir.
In the method, the time for the formation of the helium-rich natural gas reservoir is determined by combining the uniform temperature of the fluid inclusions with the history of the reservoir.
In the method, the pure methane inclusion in the reservoir rock slice and the gas-water two-phase inclusion symbiotic with the pure methane inclusion are subjected to microscopic temperature measurement and pressure correction, and the natural gas acquisition temperature and pressure are obtained, and then the natural gas reservoir formation time is obtained by combining with the reservoir history.
In the above method, the reservoir rock and the underlying sedimentary layer 4 The annual yield of He is obtained according to formula (3) and formula (4), respectively:
α store up ＝(12.06×U Store up +2.87×Th Store up )×10 -8 (3)
α Sink with a metal plate ＝(12.06×U Sink with a metal plate +2.87×Th Sink with a metal plate )×10 -8 (4)
Wherein, U Store up Representing the average uranium content, th, per gram of said reservoir rock Store up Representing the average uranium content per gram of said reservoir rock;
U sink with a metal plate Denotes the average thorium content, th, per gram of the underlying deposit Sink with a metal plate Represents the average thorium content per gram of the underlying deposit;
and (3) determining the uranium content and the thorium content by adopting an inductively coupled plasma mass spectrometry.
In the method, the reservoir can be dolomite, limestone, sandstone, glutenite and the like;
the underlying deposit may be mudstone, siltstone, argillaceous dolomites, and the like.
The invention also provides an analysis system for judging whether the substrate granite supplies helium to the helium-rich natural gas reservoir, which comprises a processor and a memory, wherein the memory is stored with a computer program;
the processor is configured to execute a computer program to implement the above-described discrimination method.
The present invention further provides a computer storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described discrimination method.
The principle of the invention for realizing discrimination is as follows: on a geologic historical time scale, the amount of helium accumulation in a helium-rich natural gas reservoir is largely controlled by the contribution of helium production in situ in the reservoir and by the contribution of helium from sources outside the reservoir. Regardless of the efficiency of helium release into the source rock and the amount of helium lost during migration and aggregation, the helium in the natural gas reservoir should be approximately equal to the sum of the reservoir in-situ helium production, the underburden helium production, and the base granite helium production (fig. 1) according to the mass balance principle. By calculating the sum of the helium production in situ in the reservoir and the helium production in the underburden, expressed as 4 He Raw material ( 4 He Raw material ＝ 4 He Store up + 4 He Sink with a metal plate ) Comparison of helium content in helium-enriched natural gas reservoirs ( 4 He Tibetan medicine ) It can be determined whether the base granite has a helium source contribution to the helium-rich natural gas reservoir ((ii)) 4 He Tibetan medicine - 4 He Raw material )/ 4 He Tibetan medicine The ratio indicates the degree of contribution).
The invention has the following beneficial technical effects:
1. the method for judging whether the base granite supplies helium to the helium-rich natural gas reservoir or not utilizes the helium generation amount calculation formula to calculate the helium generation amounts of the reservoir layer and the underlying sediment layer of the research area on the scale of geological historical time, thereby greatly improving the reliability and the accuracy of helium source data.
2. The method for judging whether the base granite supplies helium to the helium-rich natural gas reservoir is based on the mass balance principle, and the in-situ helium generation amount of the reservoir stratum, the helium generation amount of the underburden rock stratum and the helium content in the helium-rich natural gas reservoir are compared, so that the helium source contribution of the base granite to the helium-rich natural gas reservoir is effectively judged.
3. The method for judging whether the substrate granite supplies helium to the helium-rich natural gas reservoir establishes a computer analysis system comprising a processor and a memory, and can simply and quickly analyze the helium source contribution.
Drawings
FIG. 1 is a schematic view of a helium mass balance model.
Detailed Description
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
The following embodiments take a Weiyuan gas field in the Sichuan basin of China as an example, a lamp shadow group helium-rich natural gas reservoir is selected as a research object, reservoir rocks of the lamp shadow group are dolosts, underlying sedimentary layers of the lamp shadow group are steep hills, the compositions of the rocks are mainly dolosts, and sandstone and shale are adopted. By combining the helium production quantity of reservoir rocks and an underlying sedimentary layer and the helium content of a natural gas reservoir, the helium in the helium-rich natural gas reservoir of the Weiyuan gas field lamp shadow group in the Sichuan basin in China is definitely mainly derived from the base granite.
The method comprises the following specific steps:
1. the rock density tester (MH-600Z electronic densitometer) is adopted to measure the density of the rock sample, and the average density rho of reservoir rock of Wei far gas field lamp shadow group and rock of underlayer clionas mandshurica group in the four Sichuan basin of China is measured Store up And ρ Sink with a metal plate In units of g/cm 3 Respectively at 2.4g/cm 3 And 2.8g/cm 3 。
2. The porosity of a rock sample is measured by adopting a rock porosity tester, and the lamp of the Weiyuan gas field in the Sichuan basin of China is measuredAverage porosity of rock in the image group reservoir and rock in the underlying clionas
And
1.8% and 2.44%, respectively.
3. The enclosure area of the helium-rich natural gas reservoir of the Weiyuan gas field in the Sichuan basin of China is 850km 2 I.e. 850X 10 10 cm 2 Mean thickness of 500m, 5X 10, of reservoir in the light shade group 4 cm, calculating to obtain V Store up ＝4.25×10 17 cm 3 (ii) a The average thickness of the underlying steep hilly mass is 40m, i.e. 4 x 10 3 cm, calculating to obtain V Sink with a metal plate ＝3.4×10 16 cm 3 。
4. Determining the natural gas reservoir formation time by combining the uniform temperature of a fluid inclusion and the burying history, firstly carrying out microscopic temperature measurement and pressure correction on a pure methane inclusion in a reservoir lamp shadow rock slice and a gas-water two-phase inclusion coexisting with the pure methane inclusion to obtain the natural gas capturing temperature and pressure, and then combining the burying history to obtain the lamp shadow large-scale ancient gas reservoir formation time later chalky 150Ma, namely t =150 × 10 8 And (5) year.
5. Measuring the content of uranium and thorium by inductively coupled plasma mass spectrometry (ICP-MS), measuring 10 reservoir rocks of a lamp shadow group, and counting the average content U of uranium Store up ＝2.2×10 -6 Average content of thorium Th Store up ＝1.7×10 -6 (ii) a Measuring 10 rocks of a tuo group of a lower slope, and counting the average content U of uranium Sink with a metal plate ＝2.17×10 -6 Average content of thorium Th Sink with a metal plate ＝2.99×10 -6 。
6. Calculating reservoir rock of each gram of lamp shadow group and rock of underlying hillock group 4 Annual yield of He, expressed as alpha per gram of rock 4 Annual yield of He. Radioactive decay according to U, th is constant at α = (12.06 × U +2.87 × Th) × 10 -8 Reservoir rock alpha of lamp shadow group Store up ＝(12.06×2.2×10 -6 +2.87×1.7×10 -6 )×10 -8 ＝3.14×10 -13 cm 3 Per g rock/year, lower base hillside tuo group alpha Sink with a hole ＝(12.06×2.17×10 -6 +2.87×2.99×10 -6 )×10 -8 ＝3.47×10 -13 cm 3 Per g rock per year.
7. In situ generation of helium by rock ( 4 He) is calculated by the formula
Calculating the helium production of rock in the Weiyuan gas field lamp shadow group in the Sichuan basin
Helium content of rock mass of underlying abrupt mountain tuo group
8. The average concentration of helium in a natural gas sample of a Weiyuan gas field in the Sichuan basin of China is 0.2 percent, and the reserve volume of the natural gas is 1600 multiplied by 10 8 m 3 The product of helium concentration and natural gas reservoir reserve is the helium content in the helium-rich natural gas reservoir, i.e. 4 He Tibetan medicine ＝0.2％×1600×10 8 m 3 ＝3.2×10 14 cm 3 。
9. According to the mass balance principle, the helium content of the in-situ helium generation of the reservoir and the helium content of the under-lying sedimentary rock stratum are calculated 4 He Raw material ＝ 4 He Store up + 4 He Sink with a hole ＝4.72×10 13 +4.84×10 12 ＝5.20×10 13 cm 3 Comparison of helium content in helium-rich Natural gas reservoirs 4 He Tibetan medicine ＝3.2×10 14 cm 3 ， 4 He Raw material / 4 He Tibetan medicine X 100% =16.25%. It can be seen that 4 He Raw material < 4 He Tibetan medicine Showing that the granite base of the research area is on the helium-rich skyThe helium source contribution of the gas reservoir is obvious and can reach 83.75 percent.
Claims (9)
1. A method for judging whether a substrate granite supplies helium for a helium-rich natural gas reservoir or not comprises the following steps:
s1, collecting representative reservoir rock, an underlying sedimentary stratum and a helium-rich natural gas sample in a basin of a research area;
s2, measuring the helium production amount of the reservoir rock and the underlying sedimentary stratum;
s3, measuring the average concentration of helium in the helium-rich natural gas sample, and obtaining the content of helium in the helium-rich natural gas reservoir according to the natural gas reserve of the helium-rich natural gas reservoir;
s4, comparing the helium generation amount of the reservoir rock and the helium generation amount of the underlying sedimentary stratum with the helium content of the helium-enriched natural gas reservoir, namely judging whether the underlying granite contributes to the helium source of the helium-enriched natural gas reservoir:
1) If it is 4 He Raw material ≥ 4 He Tibetan medicine The substrate granite is shown to have a limited contribution to the helium source of the helium-rich natural gas reservoir;
2) If it is 4 He Raw material < 4 He Tibetan medicine The method shows that the substrate granite obviously contributes to the helium source of the helium-rich natural gas reservoir;
wherein the content of the first and second substances, 4 He raw material Representing a sum of the amounts of helium produced by the reservoir rock and the underlying sedimentary formations; 4 He tibetan medicine Indicating the helium content of the helium-rich natural gas reservoir.
2. The method of claim 1, wherein: in step S2, the helium production amounts of the reservoir rock and the underlying deposit are obtained according to equations (1) and (2), respectively:
wherein the content of the first and second substances, 4 He store up Representing the amount of helium production, alpha, of the reservoir rock Store up Expressed per gram of said reservoir rock 4 Annual yield of He,. Rho Store up Representing the average density of the reservoir rock,
represents the average porosity, V, of the reservoir rock Store up Representing the volume of the reservoir rock, and t representing the time of formation of the helium-rich natural gas reservoir;
4 He sink with a hole Represents the amount of helium, alpha, of the underlying deposition layer Sink with a metal plate Expressed per gram of the underlying deposited layer 4 Annual yield of He,. Rho Sink with a hole Represents the average density of the underlying deposited layer,
represents the average porosity, V, of the underlying deposited layer Sink with a hole Representing the volume of the underlying deposited layer.
3. The method of claim 2, wherein: measuring the density of the reservoir rock and the underlying sedimentary layer using a rock density tester;
the average density is the average of the densities of 5 to 10 samples.
4. A method according to claim 2 or 3, characterized in that: determining the porosity of the reservoir rock and the underlying sediment layer using a rock porosity tester;
the porosity is the average value of the porosities of 5 to 10 samples.
5. The method according to any one of claims 2-4, wherein: and determining the time of the formation of the helium-rich natural gas reservoir by adopting a method of combining the uniform temperature of the fluid inclusion and the burying history.
6. The method of claim 5, wherein: and carrying out microscopic temperature measurement and pressure correction on the pure methane inclusion in the reservoir rock slice and the gas-water two-phase inclusion symbiotic with the pure methane inclusion to obtain the natural gas capturing temperature and pressure, and then combining with the burial history to obtain the natural gas reservoir forming time.
7. The method according to any one of claims 2-6, wherein: of the reservoir rock and the underlying sedimentary layers 4 The annual yield of He is obtained according to formula (3) and formula (4), respectively:
α store up ＝(12.06×U Store up +2.87×Th Store up )×10 -8 (3)
α Sink with a metal plate ＝(12.06×U Sink with a hole +2.87×Th Sink with a metal plate )×10 -8 (4)
Wherein, U Store up Expressing the average uranium content, th, per gram of said reservoir rock Store up Representing the average uranium content per gram of said reservoir rock;
U sink with a metal plate Denotes the average thorium content, th, per gram of the underlying deposit Sink with a metal plate Represents the average thorium content per gram of the underlying deposit;
and (3) determining the uranium content and the thorium content by adopting an inductively coupled plasma mass spectrometry method.
8. An analysis system for determining whether a base granite provides helium to a helium-rich natural gas reservoir, comprising a processor and a memory storing a computer program;
the processor is configured to execute a computer program to implement the method of any one of claims 1-7.
9. A computer storage medium, characterized in that: the computer storage medium has stored thereon a computer program which, when executed by a processor, implements the method of any one of claims 1-7.
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| CN116071191A (en) * | 2023-04-03 | 2023-05-05 | 北京大学 | Quantitative characterization method for contribution share of helium source rock in stabilized Keraton basin helium-rich field |
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| RU2016113604A (en) * | 2016-04-08 | 2017-10-12 | Общество с ограниченной ответственностью "Научно-исследовательский институт природных газов и газовых технологий - Газпром ВНИИГАЗ" | The method of creating and operating an operational underground storage of natural gas enriched with helium |
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| RU2016113604A (en) * | 2016-04-08 | 2017-10-12 | Общество с ограниченной ответственностью "Научно-исследовательский институт природных газов и газовых технологий - Газпром ВНИИГАЗ" | The method of creating and operating an operational underground storage of natural gas enriched with helium |
| CN114910976A (en) * | 2022-04-18 | 2022-08-16 | 中国科学院西北生态环境资源研究院 | Geological evaluation method for helium resource potential in low-exploration-degree area |
| CN116125039A (en) * | 2023-01-18 | 2023-05-16 | 青海省第四地质勘查院 | Method for judging helium supply of substrate granite to helium-rich natural gas reservoir |
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