祁连山木里地区侏罗系窑街组烃源岩生烃潜力评价

徐久晟; 文志刚; 胡道功; 张耀玲; 戚帮申

祁连山木里地区侏罗系窑街组烃源岩生烃潜力评价

徐久晟^{1, 2,},
文志刚³,
胡道功⁴,
张耀玲⁴,
戚帮申⁴

1.
湖北省地震局, 武汉 430071
2.
中国地震局地震研究所地震大地测量重点实验室, 武汉 430071
3.
长江大学地球环境与水资源学院, 武汉 430100
4.
中国地质科学院地质力学研究所, 北京 100081

基金项目:

中国地质调查局天然气水合物资源勘查与试采工程国家专项"祁连山冻土区天然气水合物资源勘查(力学所)" GZHL20120301

详细信息

作者简介:
徐久晟(1989-), 男, 硕士研究生, 地质工程专业。E-mall:xujiushenggsws@126.com

中图分类号: TE122.1
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出版历程
- 收稿日期: 2014-02-12
- 刊出日期: 2015-09-01

EVALUATION OF THE HYDROCARBON GENERATION POTENTIAL OF SOURCE ROCKS OF THE JURASSIC YAOJIE FORMATION IN MULI DEPRESSION OF QILIAN MOUNTAINS

1.
Earthquake Administration of Hubei Province, Wuhan 430071, China
2.
Key Laboratory of Earthquake Geodesy, Institute of Seismology, CEA, Wuhan 430071, China
3.
School of Earth Environmental and Water Resources, Yangtze University, Wuhan 430100, China
4.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

摘要

摘要: 祁连山木里坳陷侏罗系窑街组煤系泥岩和煤有机质丰度、有机质类型和有机质成熟度分析结果表明, 窑街组煤系泥岩为好的烃源岩, 有机质类型为Ⅱ₁型, 处于成熟阶段, 以生油为主, 生气为辅; 煤为差等烃源岩, 有机质类型为Ⅲ型, 处于成熟阶段, 富氢基质镜质体含量高, 具有一定的生烃潜力。综合其它层位烃源岩分析结果, 认为窑街组煤系泥岩和晚三叠世尕勒得寺组湖相泥岩为祁连山木里地区天然气水合物的主要气源岩。
- 窑街组 /
- 生烃潜力 /
- 天然气水合物 /
- 祁连山
Abstract: The research results of the abundance, types and maturity of the organic matter of mudstone and coal seam of Yaojie coal-bearing formation in Muri depression of Qilian Mountains show that the mudstone of Yaojie coal-bearing formation is good hydrocarbon source rock and the organic matter type is sapropelic-humic (Ⅱ₁) during the mature stage in which gas generation is predominant. While the coal seams are relatively poor hydrocarbon source rocks, with the organic matter of humic type (Ⅲ) at the mature stage, which have a certain hydrocarbon generating potential. Based on the analysis of hydrocarbon source rocks in others formation, it is concluded that the mudstone of Yaojie coal-bearing formation and the lacustrine mudstone of Galedesi formation in late Triassic are the main source rocks of gas hydrates in Muri depression.
- Yaojie Formation /
- hydrocarbon generation potential /
- Muli depression /
- Qilian Mountains

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图 1 祁连山木里坳陷侏罗系窑街组烃源岩分布图

Figure 1. Distribution of source rocks of the Jurassic Yaojie formation in Muri depression of Qilian Mountain

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图 2 窑街组煤系泥岩有机碳含量与生烃潜量关系

Figure 2. Relationship between organic carbon content and hydrocarbon-generating potential of the mudstone of the Jurassic Yaojie coal-bearing formation

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图 3 窑街组煤氢指数与生烃潜量关系

Figure 3. Relationship between hydrogen index and hydrocarbon-generating potential of the coal of the Jurassic Yaojie Formation

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图 4 窑街组煤系泥岩T_max-I_H关系

Figure 4. Relationship of T_max-I_H of coal-bearing mudstone in Yaojie Formation

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图 5 窑街组煤系泥岩T_max-D关系

Figure 5. Relationship of T_max-D of coal-bearing mudstone in Yaojie Formation

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图 6 窑街组烃源岩R_o分布

Figure 6. Distribution of R_o of source rocks in Yaojie Formation

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图 7 窑街组烃源岩T_max分布

Figure 7. Distribution of T_max of source rocks in Yaojie Formation

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表 1 窑街组烃源岩参数统计

Table 1. Parametric statistics of source rocks in Jurassic Yaojie Formation

采样点		岩性	TOC/%				(S₁+S₂)/(mg·g^-1)				I_H/(mg·g^-1)				R_o/%				T_max/℃				D/%
采样点		岩性	a	b	c	d	a	b	c	d	a	b	c	d	a	b	c	d	a	b	c	d	a	b	c	d
聚乎更煤区	一露天	泥岩	5	1.28	5.89	3.29	5	1.23	11.22	4.37	5	57	178	99	/	/	/	/	5	447	462	455	5	5.67	19.8	9.67
	一露天	煤	56	42.00	88.26	85.31	56	28.72	166.5	98.8	56	111	254	194	5	0.96	1.1	1.03	56	425	471	452	56	9.57	27.2	16.9
	二露天	煤	8	44.84	78.21	62.28	8	11.84	84.37	33.54	8	88	168	125	4	0.51	0.83	0.71	8	429	438	433	8	7.47	14.5	10.9
	三露天	泥岩	3	2.17	4.45	3.01	3	3.11	7.23	4.68	3	147	160	156	/	/	/	/	3	448	449	448	3	14.3	14.9	14.7
	三露天	煤	13	38.59	87.71	69.56	13	9.14	187.43	111.62	13	70	382	240	4	0.48	0.85	0.67	13	424	447	437	13	5.97	32.0	20.3
	四井田	泥岩	4	1.93	4.58	3.3	4	2.32	12.27	6.49	3	99	408	211	1	0.83	0.83	0.83	4	448	460	454	3	8.78	35.4	18.4
	四井田	煤	14	68.64	87.03	80.9	14	63.86	171.47	131.38	14	171	298	237	3	0.89	0.95	0.91	14	439	454	448	14	14.7	25.8	20.6
冬库矿区		煤	5	80.53	85.24	82.76	5	40.1	53.7	44.58	5	131	170	150	2	0.74	0.87	0.8	5	433	438	436	5	11.8	15.5	13.4
弧山矿区		煤	8	39.33	90.28	72.55	8	11.21	27.95	17.88	8	24	58	39	5	1.53	2.06	1.86	8	516	531	524	8	2.05	4.94	3.27
江仓矿区		煤	17	65.08	91.46	82.66	17	66.74	161.75	119.38	17	107	359	224	5	0.87	1.44	1.09	17	454	482	467	17	9.03	30.4	19
全区平均值		泥岩	12	1.28	5.89	3.22	12	1.23	12.27	5.18	11	57	408	149	1	0.83	0.83	0.83	12	447	462	453	11	5.67	35.4	13.4
全区平均值		煤	121	38.59	92.9	80.26	121	9.14	187.43	94.93	121	24	382	191	28	0.48	2.51	1.06	121	424	531	455	121	2.5	32	16.5
注：TOC—总有机碳；S₁+S₂—生烃潜量；I_H—氢指数；R_o—镜质体反射率；T_max—岩石热解峰温；D—降解率；a—样品数；b—最小值；c—最大值；d—平均值

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表 2 侏罗系窑街组煤显微组分组成

Table 2. Coal macerals in the Jurassic Yaojie Formation

显微组分	样品件数	最小值	最大值	平均值
镜质组/%	28	80.74	97.74	87.90
惰性组/%	28	1.75	16.84	10.43
壳质组/%	28	0	5.26	1.10
腐泥组/%	28	0	5.26	0.53
基质镜质体/%	28	21.43	71.97	51.51
类型指数(T_i)	28	-79.21	-59.65	-75.27
类型	Ⅲ

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表 3 窑街组煤干酪根碳同位素

Table 3. The δ¹³C analysis of kerogen in the coal of Yaojie Formation

样品	δ¹³C/‰
B038-1	-24.8
H040	-23.6
H073	-25.3
B302-2	-24.1
H342	-24.0
H344	-23.7
B349-1	-23.3
H361	-23.8
H683	-24.0
H379	-24.2

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