鄂尔多斯盆地太原组砂岩缝合线特征及成因

doi:10.11885/j.issn.1674-5086.2022.03.23.03

西南石油大学学报(自然科学版) ›› 2024, Vol. 46 ›› Issue (2): 53-64.DOI: 10.11885/j.issn.1674-5086.2022.03.23.03

鄂尔多斯盆地太原组砂岩缝合线特征及成因

齐荣^1,2, 林畅松², 黄国家³, 杨香华³, 张曼莉²

1. 中国石化华北油气分公司勘探开发研究院, 河南郑州 450006;
2. 中国地质大学(北京)海洋学院, 北京海淀 100083;
3. 中国地质大学(武汉)资源学院, 湖北武汉 430074

收稿日期:2022-03-23 发布日期:2024-05-11
通讯作者: 林畅松,E-mail:lincs@cugb.edu.cn
作者简介:齐荣,1986年生,女,汉族,山东章丘人,副研究员,博士,主要从事石油天然气成藏规律等方面的研究工作。E-mail:qirong.hbsj@sinopec.com;林畅松,1958年生,男,汉族,广东遂溪人,教授,博士研究生导师,主要从事沉积学与沉积盆地分析方面的研究工作。E-mail:lincs@cugb.edu.cn;黄国家,1994年生,男,汉族,湖北孝感人,硕士研究生,主要从事石油天然气勘探方面的研究工作。E-mail:1096227118@qq.com;杨香华,1964年生,男,汉族,湖北黄陂人,教授,博士,主要从事沉积学、储层地质学等方面的研究工作。E-mail:xhyang@cug.edu.cn;张曼莉,1992年生,女,汉族,山东东营人,博士后,主要从事沉积盆地分析等方面的研究。E-mail:zhangmanli@cugb.edu.cn
基金资助:
中国石油化工股份有限公司科技部项目(P21088)；国家重点基础研究发展计划(2006CB202302)

Characteristics of Origin and Stylolites in Sandstone Reservoirs of Taiyuan Formation, Northern Ordos Basin

QI Rong^1,2, LIN Changsong², HUANG Guojia³, YANG Xianghua³, ZHANG Manli²

1. Research Institute of Exploration and Development, Huabei Oilfield Company, SINOPEC, Zhengzhou, Henan 450006, China;
2. School of Ocean Sciences, China University of Geosciences, Haidian, Beijing 100083, China;
3. School of Resources, China University of Geosciences, Wuhan, Hubei 430074, China

Received:2022-03-23 Published:2024-05-11

摘要/Abstract

摘要： 鄂尔多斯盆地北缘太原组砂岩中广泛发育缝合线构造，缝合线成因机理复杂，且会对砂岩储层的物性产生重要影响。基于岩芯观察，并通过能谱、扫描电镜、X衍射及铸体薄片等综合分析，揭示了太原组砂岩缝合线的几何形态、矿物组成及其成因机理。研究表明，太原组砂岩缝合线振幅大小差异明显，可划分出波浪型、尖峰型、长方柱型、复合型及网状交织型5种类型。缝合线物质组成主要包括有机碳、石英、伊利石、高岭石、黄铁矿、金红石和锆石，黏土矿物中伊利石的含量远高于围岩，而高岭石含量远低于围岩。缝合线内有机质与黏土矿物具有典型的沉积成因标志，它们可以作为硅质迁移与沉淀的催化剂，导致缝合线内及两侧砂岩孔隙中的硅质沉淀和碎屑石英颗粒的增生。这些缝合线构造是埋藏过程中沉积有机质压溶的产物，是沉积黏土矿物与有机质成岩作用的综合响应。缝合线相关的硅质沉淀与石英加大是研究区太原组石英砂岩致密的主要因素，但沿缝合线易发育裂缝，起到改善岩石渗透性的作用。

关键词: 缝合线构造, 石英砂岩, 有机质成岩作用, 太原组, 鄂尔多斯盆地

Abstract: Stylolites were widely developed in Taiyuan Formation sandstones at northern Ordos Basin with complex genesis mechanisms, and have important influence on the physical properties of sandstone reservoirs. Based on comprehensive analysis of core, scanning electron microscopy, energy dispersive spectrometry, X-ray diffraction and cast thin section, the geometry, mineral composition and genetic mechanism of sandstone stylolites in Taiyuan Formation are documented. The study indicates that the amplitude of sandstone stylolites in Taiyuan Formation varies obviously, and these stylolites can be classified into wave type, peak type, rectangular column type, composite type and network interweaved type. The sandstone stylolites are composed of organic carbon, quartz, illite, kaolinite, pyrite, rutile and zircon. The content of illite in the clay minerals is much higher than that in the surrounding rock, while the content of kaolinite is much lower than that in the surrounding rock. The organic matter and clay minerals of the sandstone stylolites are typical of sedimentary origin. They are catalysts for siliceous migration and precipitation, and lead to the silica precipitation and the proliferation of clastic quartz particles in the stylolites and surrounding sandstone pores. The stylolites are the products of pressure solution of sedimentary organic matter during burial, and are controlled by the diagenesis of sedimentary clay minerals and organic matters. The siliceous precipitation and quartz enlargement associated with the sandstone stylolites are the main factors for the quartz sandstone compaction in Taiyuan Formation in the study area. However, fractures which were prone to be developed along the stylolites can improve the permeability.

Key words: stylolite, quartz sandstone, organic diagenesis, Taiyuan Formation, Ordos Basin

中图分类号:

TE122

齐荣, 林畅松, 黄国家, 杨香华, 张曼莉. 鄂尔多斯盆地太原组砂岩缝合线特征及成因[J]. 西南石油大学学报(自然科学版), 2024, 46(2): 53-64.

QI Rong, LIN Changsong, HUANG Guojia, YANG Xianghua, ZHANG Manli. Characteristics of Origin and Stylolites in Sandstone Reservoirs of Taiyuan Formation, Northern Ordos Basin[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2024, 46(2): 53-64.

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鄂尔多斯盆地太原组砂岩缝合线特征及成因

Characteristics of Origin and Stylolites in Sandstone Reservoirs of Taiyuan Formation, Northern Ordos Basin

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