鄂尔多斯盆地宜川地区本溪组8号煤岩特征及成煤环境分析

沈柏坪; 李荣相; 白洪涛; 朱连丰; 雷虎; 陆纪潮

doi:10.3969/j.issn.1006-6535.2024.06.004

特种油气藏 >

2024 , Vol. 31 >Issue 6: 32 - 38

DOI: https://doi.org/10.3969/j.issn.1006-6535.2024.06.004

地质勘探

鄂尔多斯盆地宜川地区本溪组8号煤岩特征及成煤环境分析

沈柏坪 ,
李荣相 ,
白洪涛 ,
朱连丰 ,
雷虎 ,
陆纪潮

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1.中国石油录井技术研发中心,辽宁盘锦 124010;
2.中国石油长城钻探工程有限公司,辽宁盘锦 124010

沈柏坪(1986—),男,高级工程师,2010年毕业于西南石油大学资源勘查工程专业,现主要从事岩石化学综合分析与解释工作。

收稿日期: 2023-10-05

修回日期: 2024-10-09

网络出版日期: 2025-01-22

基金资助

中国石油前瞻性基础性技术攻关科技项目“深地煤岩气成藏理论与效益开发技术研究”(2022DJ8105)

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Analysis of Coal Rock Characteristics and Coal-forming Environment of the No.8 Coal Seam in the Benxi Formation in Yichuan Area,Ordos Basin

Shen Baiping ,
Li Rongxiang ,
Bai Hongtao ,
Zhu Lianfeng ,
Lei Hu ,
Lu Jichao

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1. Logging Technology Research and Development Center of CNPC,Panjin,Liaoning 124010,China;
2. GWDC Mud Logging Company,Panjin,Liaoning 124010,China

Received date: 2023-10-05

Revised date: 2024-10-09

Online published: 2025-01-22

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摘要

为明确鄂尔多斯盆地伊陕斜坡宜川—上畛子区块本溪组8号煤岩纵向优势储层及有利勘探区带,选取宜川地区本溪组8号煤岩岩心样品,通过宏观煤岩类型描述、显微组分鉴定、主微量元素分析等实验,综合分析8号煤岩沉积环境及成煤演化特征。研究表明:本溪组8号煤岩为光亮煤、半亮煤及暗淡煤混合堆积产物。煤岩有机组分以镜质组为主,惰质组次之;无机组分以高岭石、伊蒙混层等黏土矿物为主,含少量石英、长石;中下部煤岩有机组分含量多,光亮煤发育,为优质煤层。煤相及煤岩演化程度是成藏的主控因素,低位覆水森林沼泽是有利勘探区带。该认识对宜川地区本溪组8号煤岩富集规律分析具有重要意义,对煤岩气勘探开发具有较好的指导意义。

关键词： 煤层气; 煤岩特征; 成煤环境; 煤岩组分; 地球化学特征; 鄂尔多斯盆地; 宜川地区

本文引用格式

沈柏坪 , 李荣相 , 白洪涛 , 朱连丰 , 雷虎 , 陆纪潮 . 鄂尔多斯盆地宜川地区本溪组8号煤岩特征及成煤环境分析[J]. 特种油气藏, 2024 , 31(6) : 32 -38 . DOI: 10.3969/j.issn.1006-6535.2024.06.004

Abstract

To clarify the vertical dominant reservoir and favorable exploration zone of No.8 coal seam in the Benxi Formation of the Yichuan-Shangzhenzi Block in the Yishan Slope of the Ordos Basin,the cores of No.8 coal seam in the Benxi Formation of the Yichuan Area were selected,and the sedimentary environment and coal-forming evolution characteristics of No.8 coal rock were comprehensively analyzed through experiments such as macro coal rock classification,microscopic component identification,major and trace element analysis.The results indicate that the No.8 coal rock of the Benxi Formation is the mixed accumulation product of bright coal,semi-bright coal,and dull coal.The organic components of the coal rock are mainly vitrinite,followed by inertinite.The inorganic components mainly consist of clay minerals such as kaolinite and illite-montmorillonite mixed layer,containing a small amount of quartz and feldspar.The middle and lower parts of the coal are rich in organic components,and the bright coal is well-developed,which constitutes a high-quality coal seam.The evolution degree of coal facies and coal rock is the main controlling factor of hydrocarbon accumulation,and the low water-covered forest swamp is the favorable exploration zone.This understanding is highly significant for the analysis of the enrichment law of No.8 coal seam in the Benxi Formation in the Yichuan area and has an excellent guiding significance for the exploration and development of coalbed methane.

Key words： coalbed methane; coal rock characteristics; coal-forming environment; coal rock composition; geochemical characteristics; Ordos Basin; Yichuan Area

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