页岩中黄铁矿类型及其对页岩气富集的影响——以四川盆地及其周缘五峰组—龙马溪组页岩为例

张光荣; 聂海宽; 唐玄; 杜伟; 孙川翔; 陈松

doi:10.11781/sysydz202003459

页岩中黄铁矿类型及其对页岩气富集的影响——以四川盆地及其周缘五峰组—龙马溪组页岩为例

doi: 10.11781/sysydz202003459

张光荣^1,,
聂海宽^{2, 3},
唐玄^{1, 2, ,},
杜伟^{2, 3},
孙川翔^{2, 3},
陈松⁴

1.
中国地质大学(北京)自然资源部页岩气资源战略评价重点实验室, 北京 100083
2.
页岩油气富集机理与有效开发国家重点实验室, 北京 100083
3.
中国石化石油勘探开发研究院, 北京 100083
4.
中国海洋大学海洋地球科学学院, 山东青岛 266100

基金项目:

国家自然科学基金 41872124

国家自然科学基金 41972132

国家自然科学基金 41730421

详细信息

作者简介:
张光荣(1996-), 男, 硕士研究生, 从事非常规油气地质研究。E-mail: 2106180043@cugb.edu.cn

通讯作者:
唐玄(1979-), 男, 副教授, 硕士生导师, 从事非常规油气地质研究。E-mail: tangxuan@cugb.edu.cn

中图分类号: TE132.2
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- 被引次数: 0
出版历程
- 收稿日期: 2019-11-06
- 修回日期: 2020-03-26
- 刊出日期: 2020-05-28

Pyrite type and its effect on shale gas accumulation: a case study of Wufeng-Longmaxi shale in Sichuan Basin and its periphery

ZHANG Guangrong^1
,,
NIE Haikuan^{2, 3},
TANG Xuan^{1, 2
, ,},
DU Wei^{2, 3},
SUN Chuanxiang^{2, 3},
CHEN Song⁴

1.
Key Laboratory of Strategy Evaluation for Shale Gas, Ministry of Natural Resources of the People's Republic of China, China University of Geosciences(Beijing), Beijing 100083, China
2.
State Key Laboratory of Shale Oil and Gas Enrichment Mechanism and Effective Development, Beijing 100083, China
3.
SINOPEC Petroleum Exploration and Production Research Institute, Beijing 100083, China
4.
College of Marine Geosciences, Ocean University of China, Qingdao, Shandong 266100, China

摘要

摘要: 黄铁矿是页岩中普遍存在的矿物之一，对其类型、成因及其对页岩气富集的影响的研究还处在探索阶段。以四川盆地及其周缘上奥陶统五峰组-下志留统龙马溪组页岩为研究对象，通过薄片观察、扫描电镜等手段，识别出草莓状、纹层状、结核状、自形以及他形等黄铁矿类型，五峰组-龙马溪组页岩中的黄铁矿主要形成于同生沉积阶段和早成岩阶段。草莓状黄铁矿主要形成于同生沉积阶段，指示还原环境，有利于有机质富集和保存，其含量与总有机碳呈正相关关系，其发育层段常富含有机质。草莓状黄铁矿与生物成因石英、陆源碎屑石英一起形成刚性颗粒支撑格架，对原始粒间孔隙的保存具有重要作用，有利于油气充注、滞留以及有机质孔的发育。研究区五峰组-龙马溪组底部黑色页岩草莓状黄铁矿非常发育，显示其不仅具有良好的有机质富集的物质基础，也有利于页岩优质储层的形成，草莓状黄铁矿含量可以作为页岩气甜点段判识的依据。
- 黄铁矿 /
- 页岩气 /
- 五峰组 /
- 龙马溪组 /
- 四川盆地
Abstract: Pyrite is one of the most common minerals in shale, but its type, genesis and effect on shale gas accumulation are still in the initial study stage. The shale in the Upper Ordovician Wufeng Formation and the Lower Silurian Longmaxi Formation in the Sichuan Basin and its periphery was studied. Strawberry-like, stratified, tuberculosis, euhedral and anhedral pyrites were identified through thin section observation, scanning electronic microscopy analyses. The pyrites in the Wufeng-Longmaxi formations are mainly developed during the syngenetic and early diagenetic stages. The strawberry-like pyrites are formed in the syngenetic stage, indicating a reducing environment, which is conducive for organic matter enrichment and preservation. The pyrite content has a positive correlation with the organic carbon content. The layers with a high content of pyrites are usually rich in organic matter. Strawberry-like pyrites, together with biogenic quartz and terrestrial detrital quartz, formed a rigid particle grid supporting the original intergranular pores, which was beneficial to hydrocarbon charging, preservation and organic matter-hosted pore development. The bottom of the Wufeng -Longmaxi shale with well developed strawberry-like pyrite in the Sichuan Basin and its periphery, indicate it not only has a good condition for organic matter enrichment, but also is conducive to the formation of high-quality shale gas reservoirs. The strawberry-like pyrite content can be used as a clue for identifying shale gas "sweet spots".
- pyrite /
- shale gas /
- Wufeng Formation /
- Longmaxi Formation /
- Sichuan Basin

HTML全文

图 1 四川盆地及其周缘五峰组—龙马溪组主要页岩气田和页岩气井位置

Figure 1. Major gas fields and typical shale gas wells in Wufeng-Longmaxi formations in Sichuan Basin and its periphery

下载: 全尺寸图片幻灯片

图 2 四川盆地威远地区WY1井龙马溪组页岩中黄铁矿

Figure 2. Pyrite in Longmaxi shale in well WY1, Weiyuan area, Sichuan Basin

下载: 全尺寸图片幻灯片

图 3 四川盆地涪陵、威远地区龙马溪组页岩中草莓状黄铁矿

Figure 3. Strawberry-like pyrites in Wufeng-Longmaxi shale in Fuling and Weiyuan areas, Sichuan Basin

下载: 全尺寸图片幻灯片

图 4 四川盆地涪陵地区JY1井龙马溪组页岩中的自形黄铁矿

Figure 4. Euhedral pyrites in Longmaxi shale from well JY1, Fuling area, Sichuan Basin

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图 5 四川盆地龙马溪组页岩中弯曲片状伊利石晶体间充填的自形和他形黄铁矿

Figure 5. Euhedral and anhedral pyrites filling curved flake illite crystals in Longmaxi shale in Sichuan Basin

下载: 全尺寸图片幻灯片

图 6 四川盆地涪陵、丁山地区龙马溪组页岩中黄铁矿交代化石

Figure 6. Pyrite metasomatic fossils in Longmaxi shale in Fuling and Dingshan areas, Sichuan Basin

下载: 全尺寸图片幻灯片

图 7 四川盆地涪陵地区JY1井龙马溪组页岩中黄铁矿紧邻有机质呈条带状的分布

Figure 7. Banded pyrites adjacent to organic matter in Longmaxi shale in well JY1, Fuling area, Sichuan Basin

下载: 全尺寸图片幻灯片

图 8 草莓状黄铁矿的平均粒径对标准偏差的二元图解图版据参考文献[5]。

Figure 8. Average particle size of strawberry pyrites vs. standard deviation

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图 9 四川盆地JY4井龙马溪组黑色页岩中的刚性颗粒支撑格架

Figure 9. Rigid particle support grids in Longmaxi black shale in JY4 well, Sichuan Basin

下载: 全尺寸图片幻灯片

表 1 四川盆地及其周缘五峰组—龙马溪组页岩中草莓状黄铁矿粒径分布

Table 1. Particle size distribution of strawberry-like pyrite in Wufeng-Longmaxi shale in Sichuan Basin and its periphery

样品号	深度/m	统计数量	平均粒径/μm	中间粒径/μm	最大粒径/μm	标准偏差/μm
JY1S-1-1	2 330.46	40	4.55	4.46	12.80	1.99
JY1S-2-1	2 335.30	47	2.18	1.55	7.85	1.56
JY1S-3-9	2 340.82	35	2.08	1.63	5.77	1.02
JY1S-4-10	2 346.50	105	3.02	2.79	11.46	1.82
JY1S-5-5	2 352.89	103	3.21	2.56	9.10	1.90
JY1S-6-2	2 359.98	96	3.10	2.44	13.01	2.18
JY1S-7-8	2 366.74	93	3.01	2.75	8.22	1.59
JY1S-8-2	2 376.05	91	2.50	2.09	8.84	1.67
JY1S-9-3	2 381.91	131	2.41	2.04	9.78	1.53
JY1S-10-5	2 385.42	86	2.68	2.49	7.14	1.30
JY1S-11-4	2 391.95	140	2.13	1.80	7.62	1.24
JY1S-12-4	2 397.13	69	3.36	3.06	9.86	1.69
JY1S-13-3	2 402.55	100	2.55	2.17	7.28	1.42
JY1S-14-9	2 406.16	77	3.12	2.96	6.86	1.29
JY1S-15-8	2 411.05	82	3.28	2.76	14.66	2.16
JY1S-16-2	2 414.88	36	0.21	0.16	0.70	0.16

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