中国中西部富氦气藏氦气富集机理——古老地层水脱氦富集

doi:10.11764/j.issn.1672-1926.2022.03.015

Abstract

Abstract:

Helium is an associated resource in natural gas and an important scarce strategic material. However, the research on its enrichment mechanism is relatively weak. In view of the problem of helium enrichment, geochemical method is adopted to analyze the enrichment of helium in the main helium-rich gas reservoirs in China. It is considered that the reason of the helium enrichment just in a small number of gas reservoirs is that the gas reservoir captures helium released from ancient water in old sediments. The release of helium dissolved in ancient formation water into gas reservoirs is the main mechanism of helium enrichment in helium-rich gas reservoirs. It is put forward for the first time that the formation of helium-rich gas reservoir has experienced “multi-source helium supply and main source own main helium-rich”. The helium is sourced from the radioactive decay of U and Th in hydrocarbon source rocks and reservoirs, and also from the decay of U and Th of other rocks dissolved in formation water. The main source is helium dissolved in ancient formation water, a kind of water-soluble helium which is accumulated from the decay of U and Th in old sediment. Once this kind of He-bearing water meeting the free gas or gas reservoir, because the partial pressure of helium in the water is much higher than that in the free gas or gas reservoir, according to Henry's law, the helium in the water can completely be released into the gas reservoir to form a helium-rich gas reservoir.

Key words: Helium gas pool, Helium, Enrichment mechanism, Water dissolved gas, Degassing, Formation water

CLC Number:

TE122.2

Shengfei QIN, Jiyuan LI, Chuanguo LIANG, Guoxiao ZHOU, Miao YUAN. Helium enrichment mechanism of helium rich gas reservoirs in central and western China: Degassing and accumulation from old formation water[J].Natural Gas Geoscience, 2022, 33(8): 1203-1217.

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盆地	气田	井号	层位	天然气组分/%				（³He/⁴He）/10^-8	R/Ra	幔源氦比例/%	资料来源
盆地	气田	井号	层位	CH₄	CO₂	N₂	He	（³He/⁴He）/10^-8	R/Ra	幔源氦比例/%	资料来源
塔里木	和田河	玛4	O	80.35	1.36	10.39	0.21				文献［30］
		玛4-H1	O	84.14	0.09	12.80	0.25				文献［30］
		玛4-12H	C+O				0.30	9.8	0.07	0.7	文献［31］
		玛5-8H	C+O				0.30	9.8	0.07	0.7
		玛4	C+O				0.30	9.8	0.07	0.7
		玛4-10H	C+O				0.30	9.8	0.07	0.7
		玛5-4H	C+O				0.31	9.8	0.07	0.7
		玛5-1H	C				0.32	9.8	0.07	0.7
		玛5-6H	C+O				0.33	9.8	0.07	0.7
		玛4-1H	C				0.33	9.8	0.07	0.7
		玛4-3H	C				0.37	9.8	0.07	0.7
柴达木	马北	马北1					0.12	4.98	0.04	0.3	文献［32］
		马北801		76.64	0.53	8.87	0.19	6.85	0.05	0.4
		马北2-23		78.83	0.10	7.41	0.20	5.21	0.04	0.3
	东坪	东坪3	E				0.48	2.44	0.02	0.0
		东坪1	基岩	91.79	0.01	5.28	0.08	1.26	0.01	0.0	文献［33］
		东坪3	E	61.75	2.02	30.49	1.07
		东坪11	E	88.91	0.87	7.89	0.13
		东坪15	E	93.02	0.01	5.83	0.32
		东坪306	基岩	83.81	0.19	13.92	0.40
		东坪307	E	87.23	0.05	10.72	0.28
四川	威远	威2	Z₂d	85.07	4.66	8.33	0.25	2.9	0.02	0.0	文献［34］
		威23	∈₁—Z₂	85.11	4.75	8.14	0.26
		威27	Z₂d	85.85	4.70	7.81	0.22
		威28	Z₂d	88.30	3.30	7.12	0.27
		威30	Z₂d	86.57	4.40	7.55	0.34
		威39	Z₂d	86.74	4.53	7.08	0.27
		威46	Z₂d	85.66	4.66	8.11	0.25
		威63	Z₂d	85.16	5.63	7.89	0.22
		威100	Z₂d	86.80	5.07	6.47	0.30
		威106	Z₂d	86.54	4.82	6.26	0.32
		威34	Z₂d	88.14	5.78		0.28				文献［35］
		威39	Z₂d	84.91	4.73	8.86	0.27
		威70	Z₂d	85.95	4.03	8.53	0.36
		威42	O	89.25	3.97	6.52	0.19	2.50	0.02	0.0	本文
		威118	∈	90.93	0.36	6.63	0.20	2.60	0.02	0.0
		威36-1	∈	89.27	3.91	6.43	0.19	2.60	0.02	0.0
		威112	Z₂d	88.81	4.07	6.76	0.23	3.90	0.03	0.0
		威71	∈	89.75	3.10	6.81	0.22	2.70	0.02	0.0
		威46	Z₂d	84.75	5.19	9.11	0.24	2.80	0.02	0.0
	资阳	资5	Z₂d	85.57	0.01	11.88	0.32				文献［36］
		资6	Z₂d	82.05	6.59	9.67	0.20
		资2	Z₂d	88.23	3.49	4.17	0.09
		资3	Z₂d	92.20	5.66	0.97	0.01
		资7	Z₂d	94.22	3.49	1.10	0.03
		资1	Z₂d	93.59	4.31	1.22	0.04

地区	井号	层位	天然气组分/%				（³He/⁴He） /10^-8	R/Ra	测试单位和仪器
地区	井号	层位	CH₄	CO₂	N₂	He	（³He/⁴He） /10^-8	R/Ra	测试单位和仪器
威远	威202H9-7	S₁l				0.033 5	1.30	0.009 3	测试单位：中国科学院西北生态环境资源研究院测试仪器：Noblesse稀有气体质谱仪
	威204H4-5	S₁l				0.029 9	1.80	0.012 9
	威202H8-3	S₁l				0.027 1	1.40	0.010 0
	威202H55-1	S₁l				0.029 6	1.20	0.008 6
	威204H5-5	S₁l				0.030 6	1.30	0.009 3
	威202H1-5	S₁l				0.036 1	1.70	0.012 1
	威204H7-1	S₁l				0.027 8	2.60	0.018 6
	威204H40-5	S₁l				0.032 3	1.30	0.009 3
	威204H1-2	S₁l				0.031 5	1.60	0.011 4
	威204H4-2	S₁l				0.030 2	3.00	0.021 4
	威204H41-6	S₁l				0.032 7	2.50	0.017 9
	威202H9-7	S₁l	97.84	1.07	0.44	0.023 6			测试单位：中国计量科学研究院测试仪器：Agilent7890气相色谱仪
	威204H4-5	S₁l	97.54	1.50	0.45	0.024 8
	威202H8-3	S₁l	97.87	1.02	0.42	0.020 4
	威202H55-1	S₁l	97.80	1.07	0.41	0.025 1
	威204H5-5	S₁l	98.90	0.001	0.43	0.023 1
	威202H1-5	S₁l	98.66	0.001	0.49	0.049 1
	威204H7-1	S₁l	97.53	1.52	0.41	0.023 7
	威204H40-5	S₁l	98.10	0.71	0.41	0.023 7
	威204H1-2	S₁l	98.09	0.003	0.46	0.030 1
	威204H4-2	S₁l	97.63	1.08	0.55	0.029 7
	威204H41-6	S₁l	97.70	1.16	0.44	0.024 8
焦石坝	JY57-3	S₁l				0.033 7	1.76	0.012 6	测试单位：兰卡斯特大学测试仪器：Isotops NGX稀有气体质谱仪
	JY59-5	S₁l				0.040 5	1.68	0.012
	JY59-4	S₁l				0.029 3	1.29	0.009 2
	JY56-4	S₁l				0.019 9	1.02	0.007 3
	JY63-1	S₁l				0.030 1	1.70	0.012 1
	JY63-3	S₁l				0.022 4	1.14	0.008 1
昭通	YH6-6	S₁l				0.020 2	0.85	0.006 1
	YH7-5	S₁l				0.017 3	0.76	0.005 4
	44-2	S₁l				0.022 0	1.01	0.007 2

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Helium enrichment mechanism of helium rich gas reservoirs in central and western China: Degassing and accumulation from old formation water

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