四川盆地震旦—寒武系高演化烃源岩无机地球化学特征与评价

施春华; 山述娇; 郝靖; 罗冰; 曹剑

doi:10.11781/sysydz202203505

四川盆地震旦—寒武系高演化烃源岩无机地球化学特征与评价

doi: 10.11781/sysydz202203505

施春华^{1, 2, 3,},
山述娇⁴,
郝靖⁵,
罗冰⁵,
曹剑³

1.
贵州大学资源与环境工程学院, 贵阳 550025
2.
贵州大学喀斯特地质资源与环境教育部重点实验室, 贵阳 550025
3.
南京大学地球科学与工程学院, 南京 210023
4.
中国石油西南油气田分公司勘探开发研究院, 成都 610041
5.
中国石油西南油气田分公司重庆气矿, 重庆 401120

基金项目:

国家自然科学基金青年项目 41802145

国家自然科学基金面上项目 42172089

详细信息

作者简介:
施春华(1988-), 男, 博士, 副教授, 从事有机地球化学研究。E-mail: c.h.shi@hotmail.com

中图分类号: TE122.115
计量
- 文章访问数: 367
- HTML全文浏览量: 93
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- 被引次数: 0
出版历程
- 收稿日期: 2021-09-21
- 修回日期: 2022-04-28
- 刊出日期: 2022-05-28

Inorganic geochemical characteristics and evaluation of Sinian-Cambrian post-mature source rocks in Sichuan Basin

SHI Chunhua^{1, 2, 3
,},
SHAN Shujiao⁴,
HAO Jing⁵,
LUO Bing⁵,
CAO Jian³

1.
College of Resources and Environmental Engineering, Guizhou University, Guiyang, Guizhou 550025, China
2.
Key Laboratory of Karst Georesources and Environment, Ministry of Education, Guizhou University, Guiyang, Guizhou 550025, China
3.
School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210023, China
4.
Exploration and Development Research Institute, PetroChina Southwest Oil and Gas Field Company, Chengdu, Sichuan 610041, China
5.
Chongqing Gas Mine, PetroChina Southwest Oil and Gas Field Company, Chongqing 401120, China

摘要

摘要: 高演化烃源岩评价因有机质的损耗而使得传统有机地球化学参数逐渐失效，而烃源岩中的无机元素不易受成熟度的影响。为探索无机地球化学方法在高演化烃源岩评价中的应用，以四川盆地震旦—寒武系为例，基于无机(主量、微量和稀土元素)地球化学方法，从烃源岩发育的三大控制因素(古生产力、沉积环境和沉积速率)分析入手，开展了烃源岩无机地球化学研究。结果表明，综合运用Ba和Ni元素丰度确定烃源岩古生产力，Mo_EF、U_EF、Ce异常特征确定沉积水体氧化—还原条件，TiO₂/Al₂O₃比值确定沉积速率，揭示研究区烃源岩有机质富集主要受控于沉积环境与古生产力，而受沉积速率的影响相对较小；川中与威远—资阳地区下寒武统筇竹寺组烃源岩古生产力高、沉积环境最为还原，烃源岩质量最好，属于高生产力和好保存模式。无机地球化学方法是高演化烃源岩评价的一种有效途径。
- 高演化烃源岩 /
- 无机地球化学 /
- 生烃能力 /
- 烃源岩评价 /
- 震旦系 /
- 寒武系 /
- 四川盆地
Abstract: The evaluation of post-mature source rocks gradually invalidates by traditional organic geochemical parameters due to the decreasing of organic matter abundance. However, the inorganic elements in source rocks are not easily affected by thermal evolution. In order to explore the application of inorganic geochemical methods in the evaluation of post-mature source rocks, this paper takes the Sinian-Cambrian source rocks in the Sichuan Basin as an example to conduct an evaluation based on the inorganic (major, trace and rare earth elements) geochemistry method with three controlling factors of source rock development (paleoproductivity, sedimentary environment and sedimentary rate). The concentration of Ba and Ni, Mo_EF and U_EF and Ce anomaly, and TiO₂/Al₂O₃ ratio could be correlated with paleoproducitvity, sedimentary environment and sedimentary rate, respectively. The results showed that the enrichment of organic matter was mainly controlled by sedimentary environment and paleoproductivity, but are barely effected by sedimentary rate. Source rocks in the Lower Cambrian Qiongzhusi Formation in the central Sichuan and Weiyuan-Ziyang areas have high paleoproductivity and the most reduced environment and thus are one of the best quality source rocks. Therefore, inorganic geochemistry method is an effective way to evaluate postmature source rocks.
- post-mature source rock /
- inorganic geochemistry /
- hydrocarbon generation capacity /
- source rock evaluation /
- Sinian /
- Cambrian /
- Sichuan Basin

HTML全文

图 1 四川盆地二叠系沉积前古地质图

部分修改自魏国齐等^[9]。

Figure 1. Geological map of pre-Permian sediments of Sichuan Basin

下载: 全尺寸图片幻灯片

图 2 四川盆地震旦—寒武系高演化烃源岩无机地球化学参数特征

a.Ba_bio和Ni_bio特征；b.U-Mo协变关系(图版据TRIBOVILLARD等^[4])；c.TiO₂/Al₂O₃比值特征

Figure 2. Inorganic geochemical parameters of Sinian-Cambrian post-mature source rocks in Sichuan Basin

下载: 全尺寸图片幻灯片

图 3 四川盆地震旦—寒武系不同层位烃源岩古生产力、沉积环境、沉积速率参数与TOC相关关系

Figure 3. Correlation between paleoproductivity, sedimentary environment, sedimentary rate parameters and TOC of source rocks of different formations in Sichuan Basin

下载: 全尺寸图片幻灯片

图 4 四川盆地震旦—寒武系5套烃源岩发育模式

沉积格架据中石油西南油气田公司资料综合编制。

Figure 4. Development models of five Sinian-Cambrian source rocks in Sichuan Basin

下载: 全尺寸图片幻灯片

表 1 四川盆地震旦—寒武系高演化烃源岩研究样品基本信息及元素地球化学分析结果

Table 1. Sample information and element geochemical data of Sinian-Cambrian post-mature source rocks in Sichuan Basin

层位(岩性)	地区	井号	样品号	深度/m	ω(TOC)/%	Al₂O₃/%	Ba/10^-6	Ni/10^-6	Eu/Eu^*	Al/(Al+Fe+Mn)	Ti/Zr	Ba_bio/10^-6	Ni_bio/10^-6	(P₂O₅)_bio/%	Mo_EF	U_EF	Ce/Ce^*	TiO₂/Al₂O₃
筇竹寺组(泥页岩)	川中	安平1	1	5 030.0	1.93	11.0	727	64	0.93	0.71	21	329	50	0.10	55	10.3	-	0.076
			2	5 031.1	2.24	11.1	926	76	0.90	0.70	20	524	61	0.10	37	10.5	-	0.071
			3	5 033.2	1.84	13.8	863	70	0.88	0.68	22	364	52	0.06	24	7.1	-	0.058
			4	5 035.1	1.46	14.2	799	71	0.83	0.71	20	285	52	0.04	25	6.9	-	0.057
	威远—资阳	资4	5	4 224.5	1.91	12.9	1 050	140	0.97	0.68	19	583	123	0.07	24	7.1	-	0.056
			6	4 238.1	2.36	14.4	1 140	93	0.92	0.66	19	619	74	0.06	30	7.8	-	0.055
			7	4 265.4	1.15	9.4	723	34	0.94	0.85	21	383	22	0.00	12	9.0	-	0.049
	川西南	汉深1	8	5 103.5	0.40	14.4	918	47	0.97	0.68	27	397	28	0.08	5.3	2.0	-	0.054
			9	5 106.2	0.33	14.3	937	48	0.98	0.69	27	420	29	0.06	3.8	1.8	-	0.052
			10	5 106.9	0.42	14.2	1 060	47	0.94	0.66	25	546	28	0.05	4.5	1.7	-	0.052
			11	5 109.1	0.33	13.6	1 090	46	0.96	0.72	22	598	28	0.04	4.4	1.8	-	0.051
			12	5 110.5	0.52	14.6	978	47	0.91	0.72	24	450	28	0.06	7.4	2.3	-	0.055
麦地坪组(泥质白云岩)	威远—资阳	资4	13	4 296.1	0.86	0.50	416	27.3	0.95	0.45	24	398	27	6.59	-	-	-	0.086
		资4	14	4 341.3	1.21	0.65	131	39	0.95	0.66	19	107	38	0.53	-	-	-	0.044
		资7	15	3 930.9	1.40	1.81	659	27.9	0.94	0.64	20	594	26	7.68	-	-	-	0.051
	川西南	汉深1	16	5 128.5	0.42	8.2	689	26.4	0.90	0.64	24	392	16	7.19	1.8	5.4	-	0.054
			17	5 130.2	0.40	5.4	380	25.4	0.93	0.61	24	185	18	2.66	7.7	3.8	-	0.044
			18	5 131.3	0.52	0.49	33	21.1	0.95	0.25	33	15	20	0.56	-	-	-	0.050
灯影组三段(泥岩)	川中	高科1	19	5 351.9	1.49	9.9	772	57	0.89	0.62	23	414	44	2.62	4.8	4.1	-	0.054
			20	5 353.3	0.68	12.1	762	74	0.88	0.64	23	324	58	2.35	5.8	4.0	-	0.053
			21	5 355.7	0.56	5.3	435	38	0.95	0.64	23	243	31	1.28	6.2	4.8	-	0.055
			22	5 356.2	1.40	13.1	997	56	0.86	0.66	20	523	39	2.28	3.7	3.2	-	0.051
			23	5 357.0	0.58	3.4	317	27.8	0.97	0.63	16	194	23	1.73	4.7	4.3	-	0.054
			24	5 357.6	1.37	8.7	676	42	0.93	0.64	22	361	31	1.67	4.8	3.1	-	0.057
灯影组(藻云岩)	川中	高石1	25	4 976.6	0.03	0.052	81	15.3	1.41	0.09	22	79	15	0.04	-	-	0.77	-
		高科1	26	5 150.5	0.74	0.031	128	15.9	1.11	0.11	25	127	16	0.15	-	-	0.59	-
		安平1	27	5 062.9	0.96	0.023	11.1	14.0	2.01	0.08	23	10	14	0.02	-	-	0.80	-
		盘1	28	5 620.4	1.53	0.38	163	16.1	1.22	0.46	15	149	16	0.17	-	-	0.36	-
	威远—资阳	资6	29	3 678.6	0.99	0.072	36	19.7	1.38	0.11	14	33	20	0.10	-	-	0.66	-
	威远—资阳	威113	30	3 118.9	0.36	0.054	29.5	16.9	2.05	0.17	7	28	17	0.05	-	-	0.84	-
	川西南	自深1	31	5 428.1	0.05	0.065	33	15.8	1.48	0.21	9	31	16	0.03	-	-	0.85	-
陡山沱组(泥岩)	川西南	先锋	32	露头样	1.71	13.0	1 070	47	1.02	0.62	28	600	30	0.42	4.9	2.8	-	0.058
注：有机碳含量数据引用自SHI等^[10]；“-“表示未计算该值。

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