西南石油大学学报（自然科学版）2024，Vol.46Issue(2)：53-64,12.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
Characteristics of Origin and Stylolites in Sandstone Reservoirs of Taiyuan Formation,Northern Ordos Basin
摘要
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.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Key words
stylolite/quartz sandstone/organic diagenesis/Taiyuan Formation/Ordos Basin分类
能源科技引用本文复制引用
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):53-64,12.基金项目
中国石油化工股份有限公司科技部项目(P21088) （P21088）
国家重点基础研究发展计划(2006CB202302) （2006CB202302）
