准噶尔盆地西北缘天然气成因来源及勘探潜力

doi:10.11743/ogg20220113

Abstract

Abstract:

Although the Junggar Basin is one of the four major onshore petroliferous basins in China， the progress of natural gas exploration is poor with major discoveries confined to the eastern and southern parts of the basin. Based on gas composition and stable carbon isotopes， we find four types of natural gas at the northwestern margin of Junggar Basin. TypeⅠgas is primarily generated from the lacustrine source rocks of the Lower Permian Fengcheng Formation， and can be further subdivided into TypeⅠ_A （mainly derived from Shawai Sag） andⅠ_B （mainly from Mahu Sag）. Type Ⅱgas is mainly of coaliferous gas derived from the Carboniferous and Lower Permian Jiamuhe humic source rocks of high to over-mature type in the Shawan Sag. Type Ⅲ gas is a mixture of TypeⅠandⅡ. Type Ⅳ gas is of secondary biogenic gas with oil biodegradation under reservoir destruction. During the Cretaceous， a mass of coaliferous and petroliferous gases were derived from the Fengcheng， Jiamuhe and Carboniferous source rocks in the Shawan Sag， which then migrated to higher parts of the structure along the carrier system composed of faults and unconformities； while the Fengcheng source rocks in the sag was at oil generation peak during which only a small amount of petroliferous gas of low maturity could be generated and accumulate within or over margins of the sag. In this study， it is confirmed that two suites of effective gas source rocks of large scale were developed in the Upper Paleozoic， west of Junggar Basin， that is， the Carboniferous （including Jiamuhe Formation） and Fengcheng Formation source rocks， serving to shed lights on a new field of natural gas exploration. In all， the study is of a typical case to show gas-source correlation under complex geological conditions and hydrocarbon accumulation restoration， and also deepens the understanding of the exploration potential of natural gas in the Junggar Basin.

Key words: carbon isotope, genesis and origin, exploration potential, natural gas, Junggar Basin

CLC Number:

TE122.1

Deyu Gong, Changyong Zhao, Wenjun He, Long Zhao, Yumei Kong, Liya Ma, Ruiju Wang, Wei’an Wu. Genetic types and exploration potential of natural gas at northwestern margin of Junggar Basin[J]. Oil & Gas Geology, 2022, 43(1): 161-174.

Figures/Tables 13

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分类	成因来源	参数	深度/m	天然气组分含量/%									干燥系数	δ¹³C（VPDB）/‰
分类	成因来源	参数	深度/m	甲烷	乙烷	丙烷	异丁烷	正丁烷	异戊烷	正戊烷	氮气	二氧化碳	干燥系数	甲烷	乙烷	丙烷
Ⅰ_A类	P₁f高成熟油型气	最小值	2 239	57.75	1.80	0.72	0	0	0	0	0.69	0.01	0.90	-37.3	-31.5	-30.9
		最大值	4 519	94.19	5.74	2.45	0.64	0.94	0.51	0.53	30.05	1.43	0.95	-29.8	-27.9	-24.6
		平均值	3 060	88.28	3.35	1.36	0.37	0.48	0.19	0.22	4.37	0.32	0.94	-33.3	-29.5	-28.9
Ⅰ_B类	P₁f中-低成熟油型气	最小值	553	64.68	3.08	0.43	0.37	0.34	0.19	0.15	0.39	0.03	0.71	-54.4	-40.9	-37.7
		最大值	4 808	94.60	11.42	7.44	4.51	2.86	1.90	1.85	11.50	4.19	0.96	-37.0	-30.1	-25.6
		平均值	3 049	79.54	7.28	4.14	1.41	1.57	0.83	0.74	2.79	0.60	0.83	-45.8	-34.2	-32.2
Ⅱ类	P₁j/C高成熟煤型气	最小值	2 486	73.77	1.77	0.37	0.09	0.10	0.02	0.01	0.55	0.06	0.93	-35.9	-26.6	-24.7
		最大值	4 616	95.21	3.55	1.24	0.53	0.47	0.20	0.27	20.34	1.33	0.98	-25.8	-23.8	-20.6
		平均值	3 436	91.35	2.67	0.69	0.17	0.19	0.06	0.07	4.08	0.39	0.96	-30.7	-25.6	-22.9
Ⅲ类	Ⅰ类和Ⅱ类的混合气	最小值	2 215	86.61	2.10	0.49	0.16	0.23	0.06	0.05	0.82	0.13	0.91	-37.4	-29.1	-29.4
		最大值	3 521	95.63	5.62	3.34	0.51	0.60	0.22	0.23	2.82	0.30	0.97	-31.4	-27.1	-24.2
		平均值	2 928	92.21	3.50	1.33	0.28	0.35	0.11	0.11	1.78	0.21	0.94	-33.3	-27.7	-26.8
Ⅳ类	次生生物成因气	最小值	528	83.40	1.20	0.17	0.15	0.09	0.03	0.01	0.57	0.03	0.90	-50.6	-33.0	-31.9
		最大值	4 313	96.11	6.81	3.12	2.34	0.91	1.08	0.46	7.24	1.35	0.98	-40.5	-25.6	-22.3
		平均值	2 260	90.83	3.23	1.28	0.69	0.41	0.34	0.22	2.48	0.39	0.94	-44.5	-30.0	-28.6

天然气成因类型	井号	层位	深度/m	天然气组分含量/%									干燥系数	δ¹³C（VPDB）/‰			数据来源
天然气成因类型	井号	层位	深度/m	甲烷	乙烷	丙烷	异丁烷	正丁烷	异戊烷	正戊烷	氮气	二氧化碳	干燥系数	甲烷	乙烷	丙烷	数据来源
Ⅰ_B亚类	艾湖12	T₂k	3 218.0	90.59	3.08	1.23	0.37	0.34	0.19	0.15	3.47	0.34	0.94	-39.8	-30.1	-30.2	本次研究
	艾湖5	T₂k	3 359.5	88.02	3.52	1.81	0.60	0.69	0.44	0.40	3.27	0.52	0.92	-39.0	-30.1	-31.0	本次研究
	风7	P₁f	3 153.5	94.60	3.91	0.43	—	—	—	—	0.39	—	0.96	-37.0	-30.5	-25.6	文献［14］
Ⅳ类	克76	P₃w	2 964.6	91.52	4.78	1.76	—	—	—	—	0.82	—	0.93	-40.5	-29.8	-30.5	文献［14］
	玛006	T₁b	3 544.0	83.40	5.18	1.85	1.32		0.56		7.24	0.10	0.90	-48.8	-29.7	-30.3	文献［14］
	玛27	T₂k	2 304.0	91.82	3.42	1.05	0.15	0.09	0.05	0.01	2.71	0.68	0.95	-41.8	-30.1	-30.7	本次研究

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Genetic types and exploration potential of natural gas at northwestern margin of Junggar Basin

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