鄂尔多斯盆地中东部石炭系本溪组煤岩元素富集特征及成因

李渤; 张力文; 王霄; 孙砚泽; 王彦卿; 孙璐; 付德亮; 吴陈君

doi:10.11781/sysydz2025051090

鄂尔多斯盆地中东部石炭系本溪组煤岩元素富集特征及成因

doi: 10.11781/sysydz2025051090

李渤¹,
张力文²,
王霄³,
孙砚泽⁴,
王彦卿⁴,
孙璐¹,
付德亮⁵,
吴陈君^1, ,

1. 油气地球化学与环境湖北省重点实验室(长江大学资源与环境学院), 武汉 430100;
2. 中国石油长庆油田分公司长庆实业集团有限公司, 西安 710018;
3. 中国石油长庆油田分公司第一采气厂, 陕西靖边 718500;
4. 中国石油长庆油田分公司勘探开发研究院, 西安 710018;
5. 自然资源部煤炭资源勘查与综合利用重点实验室(陕西省煤田地质集团有限公司), 西安 710026

基金项目:

中国石油股份公司重大专项“深地煤岩气成藏理论与效益开发技术研究”(2023ZZ18)、陕西省重点研发计划项目(2024SF-YBXM-622)和陕西省三秦英才青年拔尖人才项目联合资助。

详细信息

作者简介:
李渤(2002—)，男，硕士生，从事煤层气研究。E-mail: lbo0606@163.com。

通讯作者:
吴陈君(1988—)，男，博士，副教授，从事非常规油气地质研究。E-mail:chenjun.wu@yangtzeu.edu.cn。

中图分类号: TE121.3
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出版历程
- 收稿日期: 2024-12-25
- 修回日期: 2025-07-05
- 刊出日期: 2025-09-28

Element enrichment characteristics and genesis of coal rocks in Carboniferous Benxi Formation, central and eastern Ordos Basin

1. Hubei Key Laboratory of Petroleum Geochemistry and Environment (School of Resources and Environment, Yangtze University), Wuhan, Hubei 430100, China;
2. Changqing Industrial Group Co., Ltd., PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710018, China;
3. No. 1 Gas Production Plant, PetroChina Changqing Oilfield Company, Jingbian, Shaanxi 718500, China;
4. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710018, China;
5. Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Ministry of Natural Resources (Shaanxi Coalfield Geology Group Co., Ltd.), Xi'an, Shaanxi 710026, China

摘要

摘要: 对鄂尔多斯盆地中东部石炭系本溪组障壁岛—沼泽沉积体系与潟湖—沼泽沉积体系煤岩的两口井10个煤样进行常量元素、微量元素和工业组分分析，探讨不同沉积体系下煤岩的元素富集特征与成因。研究结果表明：障壁岛—沼泽和潟湖—沼泽沉积体系中，煤岩的工业组分、常量元素和微量元素含量主要受成煤环境条件控制。两种沉积体系的元素主要受北部造山带物源的影响，同时也受海相沉积环境和岩浆活动的影响。障壁岛—沼泽沉积体系常量元素以Si、Al为主，与灰分有良好相关性，来源于北部造山带的多种黏土矿物；微量元素主要为无机成因，Li、Zr等元素与灰分、Si、Al等有显著相关性，表明其主要来源是陆源碎屑输入的硅铝酸盐；Sr元素来源于黏土矿物和火山岩物质，Cu、Cr元素为火山碎屑和海相磷灰石混合成因，Be、V、Cd元素则来自腐殖酸。潟湖—沼泽沉积体系中，常量元素同样以Si、Al为主，但Mg、Ca、Mn、P元素与灰分和Si、Al的相关性较差，来源于高等植物沉积埋藏；微量元素主要为无机成因，Li、Sr元素分别来源于物源输入和海相沉积有机质矿物；Be、Ga等元素为无机成因，来源于陆源碎屑物质中的长石、石英和黏土矿物；Cu、Sr、等主要来源于海相黄铁矿、磷灰石等矿物或海水作用下成岩过程中富集。
- 煤岩元素 /
- 灰分 /
- 相关性分析 /
- 富集特征 /
- 沉积体系 /
- 鄂尔多斯盆地
Abstract: Ten coal samples from two wells in the barrier island-swamp and lagoon-swamp depositional systems of the Carboniferous Benxi Formation in the central and eastern Ordos Basin were analyzed for major elements, trace elements, and industrial components to investigate the elemental enrichment characteristics and genesis of coal rocks under different depositional systems. The results indicated that in both depositional systems, the industrial components and the contents of major and trace elements in coal rocks are primarily controlled by the coal-forming environmental conditions. The elemental compositions are mainly influenced by provenance from the northern orogenic belt, marine depositional environments, and magmatic activities. In the barrier island-swamp depositional system, the major elements are dominated by Si and Al, which show strong correlations with ash content and originate from various clay minerals derived from the northern orogenic belt. The trace elements are mainly of inorganic origin. Elements such as Li and Zr show significant correlations with ash content, Si, and Al, indicating that they are primarily derived from terrigenous debris inputs of aluminosilicates. Sr is derived from clay minerals and volcanic rocks. Cu and Cr have mixed origins from volcanic debris and marine apatite. Be, V, and Cd originate from humic acids. In the lagoon-swamp depositional system, the major elements are also dominated by Si and Al. However, Mg, Ca, Mn, and P show weak correlations with ash content, Si, and Al, indicating that these elements are derived from the deposition and burial of higher plants. The trace elements are primarily of inorganic origin. Li and Sr originate from provenance inputs and organic minerals in marine sediments, respectively. Be, Ga, and related elements are of inorganic origin and are sourced from terrigenous debris such as feldspar, quartz, and clay minerals. Cu, Sr, and related elements are primarily derived from marine pyrite, apatite, and other minerals, or are enriched during diagenetic processes under the influence of seawater.
- elements in coal rock /
- ash content /
- correlation analysis /
- enrichment characteristics /
- depositional system /
- Ordos Basin

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