珠江口盆地阳江东凹文昌组泥岩稀土元素特征及其地质意义

石创

doi:10.19509/j.cnki.dzkq.2022.0067

珠江口盆地阳江东凹文昌组泥岩稀土元素特征及其地质意义

doi: 10.19509/j.cnki.dzkq.2022.0067

石创^{1, 2,}

基金项目:

"十三五"国家科技重大专项课题项目 2016ZX05024-004-002

中海油"十三五"科技重点项目 CNOOC-KJ135ZDXM37SZ

详细信息

作者简介:
石创(1988—)，男，工程师，主要从事油气成藏和资源评价方面的研究工作。E-mail: shichuang@cnooc.com.cn

中图分类号: P588.22
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出版历程
- 收稿日期: 2021-06-16

REE characteristics and geological significance of mudstones from Wenchang Formation in eastern Yangjiang Sag of Pearl River Mouth Basin

Shi Chuang^{1, 2
,}

摘要

摘要:
沉积岩中的稀土元素具有良好的化学稳定性, 能够较好保存原始沉积记录。为了揭示阳江东凹文昌组发育时期的物源区物质来源、构造背景和沉积环境, 选取凹陷内Y-1井文昌组泥岩样品进行元素测试, 系统分析研究区文昌组泥岩稀土元素地球化学特征。结果表明, 文昌组泥岩稀土元素含量高, 轻稀土元素相对富集, Eu为明显负异常, Ce为微弱正异常特征。文昌组物质来源以花岗岩为主, 含有少量沉积岩, 沉积源区为被动大陆边缘构造背景。Ce_anom和δCe参数指示文昌期水体处于还原环境, 为优质烃源岩发育提供良好的保存条件, 纵向上水体还原性演化规律为: 强→弱→强→弱, 与文昌组泥岩TOC变化趋势一致。
- 构造背景 /
- 沉积环境 /
- 稀土元素 /
- 文昌组 /
- 阳江东凹 /
- 珠江口盆地
Abstract:
The REE in sedimentary rocks have strange chemical stability and can well record the original sedimentary message.In order to explore the material source, tectonic setting and sedimentary environment of the Wenchang Formation in Eastern Yangjiang Sag, the REE geochemical characteristics of Wenchang Formation mudstones from well Y-1 in the study area were systematically analyzed.The results show that the concentrations of REE in mudstones of Wenchang Formation is high, yielding relatively enrichedof LREE, obviouslyEu negative anomaly and weak Cepositive anomaly.The material of Wenchang Formation is mainly source fromgranite with a small amount of sedimentary rocks, and thus the sedimentary source area is likely to be the passive continental margin tectonic setting.TheCeanom and δCe indicate that the water was under reducing conditions, which could provide well preservation conditions for the development of high-quality source rocks. Furthermore, the temporal variations of redox conditions are consistent with the variation trend of TOC of mudstone in Wenchang Formation.
- tectonic setting /
- sedimentary environment /
- rare earth element /
- Wenchang Formation /
- eastern Yangjiang Sag /
- Pearl River Mouth Basin

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图 1 珠江口盆地阳江凹陷构造单元及地层划分(据参考文献[9]修编)

Figure 1. Tectonic units and stratigraphic column of Yangjiang Sag, Pearl River Mouth Basin

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图 2 阳江东凹Y-1井取样位置

Figure 2. Sampling positions of Well Y-1 in eastern Yangjiang Sag

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图 3 阳江东凹文昌组泥岩样品稀土元素配分模式

Figure 3. REE distribution of mudstones from Wenchang Formation in Eastern Yangjiang Sag

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图 4 阳江东凹文昌组泥岩样品中δCe与∑REE、δEu和(Dy/Sm)_N相关关系

Figure 4. Correlation of δCe vs.∑REE, δEu and(Dy/Sm)_N of mudstones from Wenchang Formation in eastern Yangjiang Sag

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图 5 阳江东凹文昌组泥岩La/Yb与w(∑REE)交会图(底图据文献[1])

Figure 5. La/Yb vs. ∑REE of mudstones from Wenchang Formation in eastern Yangjiang Sag

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图 6 阳江东凹文昌组泥岩La-Th-Sc构造背景判别图

Figure 6. Tectonic setting discrimination of La-Th-Sc of mudstones from Wenchang Formation in eastern Yangjiang Sag

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图 7 阳江东凹文昌组泥岩δCe、V/(V+Ni)、MgO/Al₂O₃和w(TOC)纵向变化

Figure 7. Vertical variation of δCe, V/(V+Ni), MgO/Al₂O₃and TOC of mudstones from Wenchang Formation in eastern Yangjiang Sag

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表 1 阳江东凹文昌组泥岩稀土元素质量分数

Table 1. REE contents of mudstones from Wenchang Formation in eastern Yangjiang Sag w_B/10^-6

样号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu
1	39.22	84.31	8.96	32.94	7.44	1.54	7.80	0.99	5.48	0.99	2.78	0.41	2.63	0.40
2	49.52	105.97	11.13	41.03	8.94	1.66	10.84	1.29	7.20	1.29	3.62	0.52	3.33	0.49
3	48.46	102.40	10.78	39.63	8.46	1.56	10.27	1.18	6.53	1.16	3.26	0.47	3.09	0.46
4	47.82	102.15	10.76	39.57	8.69	1.65	10.37	1.21	6.74	1.20	3.35	0.48	3.11	0.46
5	54.53	116.22	12.18	44.41	10.16	2.10	11.45	1.35	7.38	1.33	3.65	0.53	3.39	0.50
6	44.95	95.44	10.05	37.10	8.24	1.63	9.59	1.17	6.52	1.19	3.32	0.49	3.07	0.47
7	62.76	132.31	14.07	52.21	11.55	2.28	13.93	1.60	8.80	1.55	4.25	0.61	3.91	0.57
8	62.41	130.19	13.90	50.09	11.34	2.43	13.25	1.45	7.90	1.38	3.80	0.55	3.53	0.52
9	50.04	109.21	11.57	42.81	9.69	1.92	11.06	1.35	7.50	1.35	3.74	0.54	3.37	0.50
10	44.63	94.26	9.35	32.22	7.06	1.69	7.50	0.92	5.08	0.90	2.49	0.36	2.35	0.35
球粒陨石^[16]	0.30	0.80	0.12	0.60	0.19	0.07	0.26	0.05	0.32	0.07	0.21	0.03	0.21	0.03
NASC^[17]	32.00	73.00	7.90	33.00	5.70	1.24	5.20	0.85	5.80	1.04	3.40	0.50	3.10	0.48
PAAS^[18]	38.00	80.00	8.90	32.00	5.60	1.10	4.70	0.77	4.40	1.00	2.90	0.40	2.80	0.43
注：NASC表示北美页岩中稀土元素的平均质量分数；PAAS表示澳大利亚后太古宙页岩中稀土元素的平均质量分数

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表 2 阳江东凹文昌组泥岩元素分析结果

Table 2. REE analyses of mudstones from Wenchang Formation in eastern Yangjiang Sag

样号	w(TOC)/ %	∑REE	∑LREE	∑HREE	∑LREE/ ∑HREE	(La/Sm)_S	(La/Yb)_S	(Gd/Yb)_S	(Dy/Sm)_S	δCe	δEu	Ce_anom	V/ (V+Ni)	MgO/ Al₂O₃
样号	w(TOC)/ %	w_B/10^-6			∑LREE/ ∑HREE	(La/Sm)_S	(La/Yb)_S	(Gd/Yb)_S	(Dy/Sm)_S	δCe	δEu	Ce_anom	V/ (V+Ni)	MgO/ Al₂O₃
1	2.43	195.90	174.41	21.49	8.12	3.34	10.43	2.39	0.44	1.03	0.64	0.001 9	0.84	5.35
2	2.82	246.83	218.25	28.58	7.64	3.51	10.41	2.63	0.48	1.03	0.53	0.001 6	0.85	3.99
3	2.45	237.70	211.29	26.41	8.00	3.63	10.98	2.69	0.46	1.02	0.53	-0.002 2	0.86	3.99
4	2.30	237.56	210.63	26.92	7.82	3.49	10.76	2.69	0.46	1.03	0.55	0.001 1	0.86	4.11
5	3.13	269.19	239.62	29.57	8.10	3.40	11.27	2.73	0.43	1.03	0.62	0.002 0	0.86	4.33
6	3.48	223.21	197.41	25.81	7.65	3.46	10.26	2.53	0.47	1.02	0.58	-0.001 3	0.85	4.35
7	2.66	310.40	275.18	35.22	7.81	3.44	11.24	2.88	0.45	1.01	0.57	-0.005 4	0.84	4.12
8	2.17	302.73	270.34	32.39	8.35	3.49	12.38	3.03	0.41	1.01	0.63	-0.005 5	0.80	4.29
9	3.49	254.64	225.23	29.41	7.66	3.27	10.39	2.65	0.46	1.04	0.59	0.006 2	0.82	3.05
10	6.00	209.16	189.20	19.95	9.48	4.01	13.31	2.58	0.43	1.04	0.73	0.012 3	0.90	1.74
注：稀土元素总量∑REE=La+Ce+Pr+Nd+Sm+Eu+Gd+Tb+Dy+Ho+Er+Tm+Yb+Lu；轻稀土元素质量分数∑LREE=La+Ce+Pr+Nd+Sm+Eu；重稀土元素质量分数∑HREE=Gd+Tb+Dy+Ho+Er+Tm+Yb+Lu；δCe=2Ce_S/(La_S+Pr_S)，δEu=2Eu_S/(Sm_S+Gd_S)；Ce_anom=lg[3×Ce_N/(2×La_N+Nd_N)]；下标S表示经过球粒陨石标准化，下标N表示经过北美页岩标准化

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表 3 阳江东凹文昌组泥岩与不同构造背景杂砂岩稀土元素特征值比较

Table 3. Comparison of REE values between the mudstones of Wenchang Formation in eastern Yangjiang Sag and heterogeneous sandstones in different tectonic settings

构造背景	活动大陆边缘	被动大陆边缘	研究区校正后均值
w(La)/10^-6	37.00	39.00	42.00
w(Ce)/10^-6	78.00	85.00	89.00
w(∑REE)/10^-6	186.00	210.00	207.00
∑LREE/∑HREE	9.10	8.50	6.72
La/Yb	12.50	15.90	13.27
(La/Yb)_N	8.50	10.80	9.29
δEu	0.60	0.56	0.50
注：数据值据参考文献[26]

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