黔北地区下寒武统牛蹄塘组泥岩沉积环境及页岩气勘探潜力

何洪茜; 肖加飞; 杨海英; 兰青; 黄明亮

doi:10.19826/j.cnki.1009-3850.2023.03002

黔北地区下寒武统牛蹄塘组泥岩沉积环境及页岩气勘探潜力

1.
中国科学院地球化学研究所矿床地球化学国家重点实验室，贵州　贵阳　550081

2.
中国科学院大学，北京　100049

基金项目: 国家自然科学基金项目（41830432，41972095）；贵州省科技计划项目（黔科合字基础[2017]1194）

详细信息

作者简介: 何洪茜（1997—），女，硕士，研究方向为沉积矿产。E-mail：hehongxi9@163.com

通讯作者: 肖加飞（1961—），男，研究员，从事沉积地球化学及沉积矿产研究。E-mail：xiaojiafei5@163.com

中图分类号: P618.13

收稿日期: 2022-02-20

修回日期: 2022-10-14

录用日期: 2022-10-13

刊出日期: 2024-06-30

Sedimentary environment and shale gas exploration potential of Lower Cambrian Niutitang Formation in northern Guizhou

1.
State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China

2.
University of Chinese Academy of Sciences, Beijing 100049, China

More Information

Corresponding author: XIAO Jiafei, xiaojiafei5@163.com

Received Date: 20 February 2022

Revised Date: 14 October 2022

Accepted Date: 13 October 2022

Publish Date: 30 June 2024

摘要

摘要:
寒武系下统牛蹄塘组是中国南方海相碳质页岩赋存的主要层位之一，在贵州北部、中部及东部广泛分布，层位稳定。牛蹄塘组以黑色炭质泥岩为主，岩层多为薄层状，具水平层理，其组分主要为黏土矿物、石英及少量的碳质组分和黄铁矿。与澳大利亚后太古代页岩（PAAS）平均值相比，泥岩V、Mo、U含量较高，而Co、Cu、Zn和Th含量较低。V/Cr、Ni/Co、U/Th、V/(V+Ni)的元素比值以及AU含量表明，牛蹄塘组黑色泥岩沉积环境呈缺氧还原状态。样品(La/Yb)_N值明显大于1，轻、重稀土元素分异程度较大，指示沉积速率较低。有机质丰度较高，有机质成熟度为高—过成熟阶段，脆性矿物含量较高，有效厚度约为30~100 m。综上，黔北牛蹄塘组黑色泥岩存在形成页岩气藏的较好物质条件，具有良好的页岩气勘探潜力。
- 牛蹄塘组 /
- 页岩气 /
- 沉积环境 /
- 勘探潜力 /
- 黔北
Abstract:
The Lower Cambrian Niutitang Formation is one of the major marine carbonaceous shale horizons in southern China, which is widely distributed in northern, central and eastern Guizhou with stable horizons. The Niutitang Formation is mainly composed of black carbonaceous mudstone, which is thin-bedded and horizontally bedded. Its components are mainly clay minerals, quartz and a small amount of carbonaceous components and pyrite. Compared with the mean values of Australian Post-Archean Shale (PAAS), the contents of V, Mo, and U in the mudstone of Niutitang Formation are higher, while the contents of Co, Cu, Zn, and Th are lower. The content of AU, as well as the element content ratios of V/Cr, Ni/Co, U/Th, and V/(V+Ni) indicate that the sedimentary environment of the black mudstone in the Niutitang Formation is in a state of hypoxia reduction. The (La/Yb)_Nratio is significantly greater than 1, with a large degree of differentiation between light rare earth elements and heavy rare earth elements, indicating a low deposition rate. The TOC abundance of the mudstone in the Niutitang Formation is high, at the stage of high maturity to over maturity, with a high content of brittle minerals, and an effective thickness of approximately 30 to 100 meters. In conclusion, the black mudstone of the Niutitang Formation in northern Guizhou Province possesses good material conditions for the formation of shale gas reservoirs, indicating its promising potential for shale gas exploration.
- Niutitang Formation /
- shale gas /
- sedimentary environment /
- exploration potential /
- northern Guizhou

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图 1 黔北牛蹄塘组剖面的分布和对比

Figure 1.

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图 2 湄潭县梅子湾牛蹄塘组剖面柱状图

Figure 2.

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图 3 牛蹄塘组黑色泥岩稀土配分曲线

Figure 3.

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图 4 牛蹄塘组黑色泥岩的露头和结构特征

Figure 4.

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