准噶尔盆地沙湾凹陷周缘中、浅层天然气地球化学特征及成因

doi:10.11743/ogg20220114

Abstract

Abstract:

Natural gas on the periphery of Shawan Sag， is generally derived from mixed sources. A lack of holistic study on this area in the early stage has restricted the understanding of natural gas accumulation therein. In this regard， a systematic analysis of geochemical characteristics of the natural gas is carried out by means of source-rock thermal simulation， by which the genetic types of mid-to-shallow gas on the periphery of the Shawan Sag are identified. The research results show that the natural gas in the study area is dominated by methane， with a drying coefficient ranging from 0.73 to 1.00， and a δ¹³C₁ value from -56.0 ‰ to -31.5 ‰， indicating coexistence of mature and high-to-over-mature natural gas therein. A δ¹³C₂ value varying between -30.4 ‰ and -22.8 ‰ reflects a mixed distribution of coaliferous， petroliferous and mixed gas. In addition， the analysis of carbon isotopic characteristics of source-rock pyrolysis gas， shows that the natural gas in the study area is of 4 types in genesis： Type Ⅰ natural gas， featuring a very high δ¹³C₂ value greater than -25.5 ‰ and a methylcyclohexane content greater than 50 % in lighter hydrocarbon C7， is derived from source rocks of the Jiamuhe Formation， and mainly distributed in the Cretaceous in the middle of Hongche fault belt； Type Ⅱ natural gas of sparse distribution is mainly secondary biogas from crude oil degradation， with an abnormally negative δ¹³C₁ value and an extremely high drying coefficient； Type Ⅲ natural gas is originated from the Xiawuerhe Formation source rocks and mainly distributed in the Jurassic Formation in Xiaoguai area and southern Hongche fault belt， with a δ¹³C₂ value varying from -27.9 ‰ to -26.4 ‰， a characteristic of mixed source rocks； and Type Ⅳ natural gas is mainly derived from source rocks of both Xiawuerhe Formation and Fengcheng Formation， and mainly distributed in the southern Hongche fault belt and northern Jinlong area. Among others， the natural gas mainly derived from the Xiawuerhe Formation features a δ¹³C₂ value greater than -29 ‰， and that from the Fengcheng Formation features a δ¹³C₂ value less than -29 ‰.

Key words: carbon isotope, thermal simulation, petroliferous gas, coaliferous gas, biogas from crude oil degradation, natural gas, Shawan Sag, Junggar Basin

CLC Number:

TE122.1

Erting Li, Jun Jin, Jian Wang, Wanyun Ma, Shijia Chen, Cuimin Liu, Haijing Wang. Geochemical characteristics and genesis of mid-to-shallow natural gas on the periphery of Shawan Sag， Junggar Basin[J]. Oil & Gas Geology, 2022, 43(1): 175-185.

Figures/Tables 8

Fig.1

Table 1

Table 2

Fig.2

Fig.3

Table 3

Fig.4

Fig.5

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井号	层位	岩性	TOC/%	T_max/℃	HI/（mg·g^-1）
拐16	P₁j	凝灰质泥岩	2.51	433	25.10
克85	P₁j	沉凝灰岩	1.04	445	24.04
581	P₁j	含凝灰泥岩	0.74	408	6.75
风南1	P₁f	白云质泥岩	0.70	437	277.14
风20	P₁f	白云岩	5.51	436	681.20
风南2	P₁f	白云质泥岩	2.18	440	459.17
金探1	P₂w	深灰色泥岩	1.41	450	262.41
玛004	P₂w	泥岩	1.44	436	52.08
克76	P₂w	泥岩	1.77	443	58.19

井区	井号	层位	天然气组分含量/%					C₁/C_1-5	δ¹³C/‰
井区	井号	层位	N₂	C₁	C₂	C₃	C₄₊	C₁/C_1-5	C₁	C₂	C₃
红车断裂带南段	沙门1	J₁s	0.71	92.29	3.06	1.51	1.95	0.94	-31.5	-27.1	-26.3
	沙门1	K₁q	1.71	95.93	1.84	0.39	0.51	0.97	-32.2	-30.3	—
	石桥1	K₁q	7.58	77.55	10.36	3.38	1.11	0.84	-32.6	-26.4	-24.8
红车断裂带中段	车80	K₁q	2.86	94.83	1.51	0.38	0.24	0.98	-33.6	-23.8	-23.4
	车2033	K₁tg	3.04	93.87	1.73	0.38	0.38	0.97	-32.3	-23.2	-19.9
	车83	K₁tg	5.44	86.79	2.82	1.16	1.14	0.95	-31.6	-22.8	-22.0
	沙排1	K₁tg	2.73	95.05	1.31	0.25	0.51	0.98	-31.5	-24.5	—
	红光3	K₁tg	1.64	93.69	2.02	0.65	1.53	0.96	-33.2	-25.4	-25.0
	车排6	K₁q	3.49	93.19	1.77	0.37	0.27	0.98	-32.4	-25.5	-24.4
	车82	J₁b	0.24	95.79	1.79	0.30	1.08	0.97	-44.1	-26.6	—
	车排701	J₁b	2.00	92.32	1.70	0.27	0.46	0.98	-42.3	-27.8	-25.1
红车断裂带北段	拐16	J₁s	0.79	98.46	0.39	0.03	0.04	1.00	-56.0	-25.6	-17.1
	红山4	T₂k	1.42	88.20	4.15	2.15	3.54	0.90	-43.2	-28.8	-23.9
	红山5	T₂k	0.87	90.94	3.49	1.84	2.75	0.92	-34.1	-28.9	-27.2
	红96	T₂k	1.77	92.34	1.79	0.35	1.63	0.96	-35.6	-30.4	-23.4
	红山1	T₂k	3.41	92.09	2.35	0.58	0.96	0.96	-34.9	-30.4	-25.7
小拐地区	中佳4	J₁b	2.69	90.65	2.89	1.98	2.18	0.93	-35.8	-28.0	-28.6
	新光1	J₁b	0.92	84.36	5.03	4.29	4.80	0.86	-35.8	-27.8	-27.7
	中佳3	J₁b	4.73	88.96	2.69	1.29	1.37	0.94	-36.8	-27.6	-27.7
金龙地区	金龙20	T₂k	1.53	93.39	3.11	1.04	0.70	0.95	-32.9	-28.2	-27.9
金龙地区	金龙19	T₂k	1.71	91.33	3.10	1.26	2.16	0.94	-33.9	-29.5	-29.0

井位	井号	层位	气油比/（m³·m^-3）	C₇轻烃组分含量/%			庚烷值	异庚烷值
井位	井号	层位	气油比/（m³·m^-3）	正庚烷	甲基环己烷	二甲基环戊烷	庚烷值	异庚烷值
红车断裂带南段	沙门1	J₁s	157	38.51	43.11	18.38	24.08	1.65
	沙门1	K₁q	93	44.27	38.21	17.53	23.98	1.87
	石桥1	K₁q	气层	44.44	45.04	10.52	5.25	1.16
红车断裂带中段	车80	K₁q	气层	37.07	49.90	13.03	25.63	3.17
	车2033	K₁tg	—	34.07	50.12	15.81	23.05	1.50
	车83	K₁tg	20 629	36.62	51.85	11.53	27.21	1.61
	沙排1	K₁tg	19 136	—	—	—	—	—
	红光3	K₁tg	24 787	37.04	49.29	13.68	30.62	2.90
	车排6	K₁q	气层	32.11	49.84	18.05	22.22	2.67
	车82	J₁b	35	21.29	56.87	21.84	12.40	0.93
	车排701	J₁b	气层	9.50	67.77	22.73	5.12	0.83
红车断裂带北段	拐16	J₁s	229	—	—	—	—	—
	红山4	T₂k	381	28.39	48.26	23.35	1.25	0.99
	红山5	T₂k	327	37.70	42.78	19.52	3.06	1.21
	红96	T₂k	381	46.08	35.27	18.65	20.11	2.70
	红山1	T₂k	0	61.63	12.23	26.14	33.58	0.94
小拐地区	中佳4	J₁b	0	35.71	45.71	18.57	23.15	1.42
	新光1	J₁b	146	35.68	46.85	17.47	22.65	1.48
	中佳3	J₁b	19 456	31.25	43.75	25.00	31.82	1.43
金龙地区	金龙20	T₂k	914	47.54	34.43	18.03	25.22	2.10
金龙地区	金龙19	T₂k	962	56.74	26.60	16.67	31.62	2.90

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Geochemical characteristics and genesis of mid-to-shallow natural gas on the periphery of Shawan Sag， Junggar Basin

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