方解石脉体形成时间与流体来源及其地质意义: 以苏北盆地黄桥地区三叠系青龙组碳酸盐岩储层为例

陈俊林; 黄亚浩; 郭小文; 罗涛; 王岩磊; 张旭友; 胡志啟; 江红满; 王洋

doi:10.19509/j.cnki.dzkq.tb20230099

方解石脉体形成时间与流体来源及其地质意义: 以苏北盆地黄桥地区三叠系青龙组碳酸盐岩储层为例

doi: 10.19509/j.cnki.dzkq.tb20230099

1.
中国地质大学(武汉)构造与油气资源教育部重点实验室, 武汉 430074
2.
长江大学资源与环境学院, 武汉 430199

基金项目:

国家自然科学基金项目 U20B6001

详细信息

作者简介:
陈俊林, E-mail: chenjunlin@cug.edu.cn

通讯作者:
郭小文, E-mail: guoxw@cug.edu.cn

中图分类号: P618.13
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- 文章访问数: 484
- PDF下载量: 65
- 被引次数: 0
出版历程
- 收稿日期: 2023-02-27
- 录用日期: 2023-06-27
- 修回日期: 2023-06-26

Formation time and fluid source of calcite veins and geological significance: An example from the Triassic Qinglong Formation carbonate reservoirs in the Huangqiao area, Subei Basin

1.
Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences(Wuhan), Wuhan 430074, China
2.
School of Resources and Environment, Yangtze University, Wuhan 430199, China

More Information

Author Bio:
CHEN Junlin, E-mail: chenjunlin@cug.edu.cn

Corresponding author: GUO Xiaowen, E-mail: guoxw@cug.edu.cn

摘要

摘要:
裂缝方解石脉是构造成岩作用的产物, 记录了裂缝开启和流体活动的信息。基于岩石薄片观察、阴极发光和U-Pb同位素定年在厘清苏北盆地黄桥地区三叠系青龙组碳酸盐岩中方解石脉发育期次和形成时间, 通过稀土元素特征, C、O、Sr同位素特征综合分析了方解石脉体成脉流体来源。结果表明: 黄桥地区青龙组发育4期方解石脉体, 4期方解石脉体形成时间分别为(115.30±0.42), (97.03±0.43), (85.29±0.25), (45.5±19.0) Ma。第1和第2期方解石成脉流体分别来源于深部热液流体和大气淡水以及海水的混合流体。第3期方解石成脉流体来源于同层地层水和深部壳源热液流体的混合流体。第4期成脉流体来源于同层地层水和深部幔源热液流体的混合流体。苏北盆地黄桥地区三叠系青龙组碳酸盐岩储层中4期脉体的形成时间与不同期次构造活动具有对应关系, 表明构造活动对流体活动的控制作用。储层中3期深部热液流体的注入是因为构造活动导致深大断裂沟通深部流体而注入到储层中的结果, 多期的深部热液流体活动可能指示了黄桥地区三叠系青龙组储层具有多期油气成藏的特征。
- 方解石脉体 /
- 碳酸盐岩储层 /
- U-Pb同位素年龄 /
- 流体来源 /
- 流体活动 /
- 黄桥气田 /
- 苏北盆地
Abstract: Objective
Calcite veins are the products of tectonic diagenesis. Information about fracture opening and fluid activity was recorded by calcite veins.
Methods
Multiple approaches, consisting of thin section observation, cathodoluminescence, U-Pb isotope dating, and REE, C, O and Sr isotope analyses of calcite veins from the Triassic Qinglong carbonate reservoirs in the Huangqiao area, Subei Basin, are used to analyse the origin of vein-forming fluid.
Results
Four stages of calcite veins were identified in the Qinglong Formation and successively formed at (115.30±0.42), (97.03±0.43), (85.29±0.25), (45.5±19.0) Ma. In the first stage, the calcite veins were derived from deep hydrothermal fluids.And in the second stage, the calcite veins were derived from mixed fluids of atmospheric fresh water and seawater. Formation water and deep shell-source hydrothermal fluid mixed in the vein-forming fluid of the third-stage calcite veins. In the fourth stage of calcite veins formation, deep mantle-source hydrothermal fluid mixed with the formation water, resulting in the precipitation of calcite veins. The formation timing of the four stages of calcite veins corresponds to multistage tectonic movements during different periods, indicating that fluid evolution in the Triassic Qinglong carbonate reservoirs was controlled by multiple stages of tectonic movements.
Conclusion
Importantly, three stages of deep hydrothermal fluid injectionin the reservoir were the result of deep fault opening caused by tectonic movements, which possibly indicate multistage hydrocarbon accumulation in the Triassic Qinglong Formation in the Huangqiao area.
- calcite vein /
- carbonate reservoir /
- U-Pb isotope age /
- fluid source /
- fluid activity /
- Huangqiao gas field /
- Subei Basin
注释:

所有作者声明不存在利益冲突。

The authors declare that no competing interests exist.

HTML全文

图 1 苏北盆地构造单元及黄桥气田分布

Figure 1. Distribution of tectonic units and Huangqiao gas field in the Subei Basin

下载: 全尺寸图片幻灯片

图 2 苏北盆地黄桥气田地层综合柱状图

Figure 2. Comprehensive stratigraphic bar chart of the Huangqiao gas field in the Subei Basin

下载: 全尺寸图片幻灯片

图 3 苏北盆地黄桥地区三叠系青龙组方解石脉体岩相学和阴极发光特征

a~c.S174井，1 610.5 m，青龙组，裂缝充填C₁方解石，C₁方解石阴极发光呈亮红色；d~f.X2井1 738.36 m，青龙组，缝洞充填C₂和裂缝充填C₃方解石，C₂方解石阴极发光呈暗红色，C₃方解石阴极发光呈橘黄色；g, h.N13井1 438.56 m，青龙组，孔洞中充填C₄方解石，阴极发光呈暗红色

Figure 3. Petrography and cathodeluminescence characteristics of calcite veins from the Triassic Qinglong Formation in the Huangqiao area, Subei Basin

下载: 全尺寸图片幻灯片

图 4 苏北盆地黄桥地区三叠系青龙组脉体方解石激光原位U-Pb同位素年龄

n.测试点个数；MSWD.加权平均方差

Figure 4. Laser in situ U-Pb isotopic ages of calcite veins from the Triassic Qinglong Formation in the Huangqiao area, Subei Basin

下载: 全尺寸图片幻灯片

图 5 苏北盆地黄桥地区三叠系青龙组方解石脉体与围岩稀土元素配分模式(PAAS.澳大利亚页岩)

Figure 5. Distribution pattern of rare earth elements between calcite veins and surrounding rocks from the Triassic Qinglong Formation in the Huangqiao area, Subei Basin

下载: 全尺寸图片幻灯片

图 6 苏北盆地黄桥地区三叠系青龙组方解石脉体及围岩C、O同位素特征和Z值

Figure 6. C and O isotopic characteristics and Z values of calcite excised from veins and surrounding rocks from the Triassic Qinglong Formation in the Huangqiao area, Subei Basin

下载: 全尺寸图片幻灯片

图 7 苏北盆地黄桥地区三叠系青龙组方解石脉体及围岩Sr同位素特征

Figure 7. Sr isotope characteristics of calcite veins and surrounding rocks from the Triassic Qinglong Formation in the Huangqiao area, Subei Basin

下载: 全尺寸图片幻灯片

图 8 苏北盆地黄桥地区埋藏史(改自文献[51])

Figure 8. Burial history of the Huangqiao area, Subei Basin

下载: 全尺寸图片幻灯片

表 1 苏北盆地黄桥地区三叠系青龙组方解石脉体与围岩特征元素参数

Table 1. Characteristic elemental parameters of calcite veins and surrounding rocks from the Triassic Qinglong Formation in the Huangqiao area, Subei Basin

样品	w(Fe)/10^-6	w(Mn)/10^-6	w(Sr)/10^-6	Fe/Mn	Mn/Sr	Y/Ho	La/Ho
C₁方解石脉体	5 468.55	2 211.82	2 485.52	2.47	0.89	30.27	6.45
C₁方解石脉体	5 664.54	2 159.44	2 665.74	2.62	0.81	32.90	6.96
C₁方解石脉体	6 112.30	2 198.66	3 097.30	2.78	0.71	35.37	9.34
C₁方解石脉体	6 078.90	2 185.26	3 189.04	2.78	0.69	33.75	9.11
C₁方解石脉体	3 792.93	1 652.97	8 14.50	2.29	2.03	32.23	3.84
C₁方解石脉体	5 509.96	2 076.61	2 546.05	2.65	0.82	38.33	11.35
C₂方解石脉体	134.08	219.18	1 852.69	0.61	0.12	59.82	1.08
C₂方解石脉体	127.66	219.35	1 426.23	0.58	0.15	47.44	0.41
C₂方解石脉体	115.36	211.10	1 797.10	0.55	0.12	48.00	0.35
C₃方解石脉体	171.00	998.41	452.22	0.17	2.21	34.82	0.04
C₃方解石脉体	165.88	1 268.72	506.04	0.13	2.51	35.77	0.05
C₃方解石脉体	181.73	1 512.56	23 254.05	0.12	0.07	41.56	0.12
C₄方解石脉体	4 829.25	247.76	661.94	19.49	0.37	30.53	6.95
C₄方解石脉体	4 702.50	250.32	340.08	18.79	0.74	29.07	6.66
C₄方解石脉体	4 476.20	253.72	476.45	17.64	0.53	30.15	6.88
围岩	589.09	57.21	637.30	10.30	0.09	34.72	4.81
围岩	1 062.09	42.90	551.68	24.76	0.08	30.41	13.94
围岩	2 883.60	132.09	897.39	21.83	0.15	32.26	33.20
围岩	2 173.29	103.35	923.87	21.03	0.11	26.74	23.98

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