摘要
黄铁矿是页岩中重要的标志性矿物,其微观特征研究对沉积环境分析具有重要意义。针对泸州、长宁地区五峰组-龙马溪组页岩黄铁矿的特征及其沉积环境指示意义展开研究。宏观上,黄铁矿呈层状、结核状、颗粒状等多样形态;微观上分为草莓状、自形粒状、串珠状等类型。草莓状黄铁矿由粒径均匀的微晶体组成,晶体以八面体和五角十二面体为主,粒径集中在4.7~6.7μm。研究表明,草莓状黄铁矿的形成受控于硫饱和度高、缺氧-还原环境,指示有机质保存潜力。结合区域地质背景与扫描电镜分析,揭示两区块页岩沉积环境特征,为页岩气富集及开发提供科学依据。
Pyrite is an important marker mineral in shale,and its microscopic characteristics play a significant role in sedimentary environment analysis.This study focuses on the characteristics of pyrite in the Wufeng-Longmaxi formations of the Luzhou and Changning areas and its implications for the sedimentary environment.Macroscopically,pyrite exhibits diverse morphologies such as laminated,nodular,and granular forms.Microscopically,it can be classified into types including framboidal,euhedral granular,and beaded.Framboidal pyrite is composed of microcrystals with uniform grain sizes,predominantly exhibiting octahedral and pentagonal dodecahedral forms,with grain sizes ranging from 4.7 to 6.7μm.The study indicates that the formation of framboidal pyrite is controlled by high sulfur saturation and anoxic-reducing conditions,which imply potential for organic matter preservation.Combining regional geological context and scanning electron microscopy analysis,this research reveals the sedimentary environmental characteristics of the shale in the two regions,providing scientific insights for shale gas enrichment and development.
作者
杨睿欣
廖纪佳
章桂铖
Yang Ruixin;Liao Jijia;Zhang Guicheng(School of Earth Science and Technology,Southwest Petroleum University,Chengdu 610599)
出处
《石化技术》
2025年第5期255-257,共3页
Petrochemical Industry Technology
关键词
黄铁矿
沉积环境
五峰组-龙马溪组
页岩气
Pyrite
Sedimentary environment
Wufeng-Longmaxi formations
Shale gas
