沉积与特提斯地质2025，Vol.45Issue(1)：102-111,10.DOI:10.19826/j.cnki.1009-3850.2024.10001
鄂尔多斯盆地南缘蓟县系冯家湾组微生物岩成储机制
Reservoir formation mechanism of the microbialite in the Fengjiawan Formation of the Mesoproterozoic Jixian System,southern Ordos Basin
摘要
Abstract
Dolomite crystals and related pores and vugs,evidently controlled by organic-rich fabrics,can be found in the siliceous stromatolites and oolites in the Fengjiawan Formation of the Mesoproterozoic Jixian System,located in the southern Ordos Basin.With the application of microscope,scanning electron microscope(SEM),cathodoluminescence,large-area SEM image acquisition,and in-situ trace element imaging,it can be observed that many euhedral dolomite crystals are concentrated within the dark laminae of the stromatolites and the dark spheres of the ooids,with gaps present on the crystal peripheries.A considerable number of these dolomite crystals have undergone dissolution,leading to the formation of moldic pores and vugs,which are the dominant matrix pores in the stromatolites and oolites in the study area.Dolomite formation and dissolution were confined to the organic-rich fabrics.The microenvironment within these fabrics was influenced by microbial factors,with the enrichment of necessary diagenetic substances and changes in pH.These phenomena and scientific understandings may have some referential value for the genesis of some Precambrian dolomites and microbial-related diagenesis,which are of great significance for petroleum geology.关键词
鄂尔多斯盆地/冯家湾组/微生物岩/白云石/溶蚀Key words
Ordos Basin/Fengjiawan Formation/microbialite/dolomite/dissolution分类
地质学引用本文复制引用
张静,张宝民..鄂尔多斯盆地南缘蓟县系冯家湾组微生物岩成储机制[J].沉积与特提斯地质,2025,45(1):102-111,10.基金项目
中国石油天然气集团有限公司基础性前瞻性重大科技专项"叠合盆地中下组合油气成藏与保持机制研究"(2023ZZ02) （2023ZZ02）
国家重点研发计划项目"超深层及中新元古界油气资源形成保持机制与分布预测"(2017YFC0603104) （2017YFC0603104）
