石油实验地质2016，Vol.38Issue(4)：460-465,472,7.DOI:10.11781/sysydz201604460
川东南涪陵地区五峰-龙马溪组硅质页岩的生物成因及其油气地质意义
Biogenic origin and hydrocarbon significance of siliceous shale from the Wufeng-Longmaxi formations in Fuling area, southeastern Sichuan Basin
摘要
Abstract
Drill core samples were collected from the Fuling area in the southeastern Sichuan Basin to study the origin of siliceous shale rich in organic matter in the Wufeng-Longmaxi formations. X⁃ray diffraction, optical mi⁃croscopy, scanning electron microscopy and energy dispersive spectroscopy were applied to study the mineral components, micro⁃morphology and structure of the samples. Quartz is dominant in the lower part of Wufeng-Longmaxi formations, and decreases gradually upwards, while clay content increases. Abundant biological resi⁃due and debris with circled growth structure and needle structure were clearly observed, especially in the Wufeng Formation and the lower part of Longmaxi Formation. The circled structure has a skirt⁃like boundary, and was filled with microcrystalline quartz. Smaller quartz grains among biological residues are like irregular balls or ellip⁃soids. They are not idiomorphic, and are authigenic quartz via silica precipitation from siliceous organism dissolu⁃tion. Debris scattered in mineral matrix, either in complete or clastic form. The enrichment of siliceous organisms and siliceous recrystallization provide direct biogenic evidence for siliceous shale in the Wufeng-Longmaxi forma⁃tions, which has an important significance for potential hydrocarbon recovery, water sedimentary environment trace, micro⁃pore and fracture structure, and rock mechanics analysis.关键词
石英/生物成因硅/硅质页岩/五峰-龙马溪组/涪陵地区/川东南Key words
quartz/biogenic silica/siliceous shale/Wufeng-Longmaxi formations/Fuling area/southeastern Sichuan Basin分类
能源科技引用本文复制引用
卢龙飞,秦建中,申宝剑,腾格尔,刘伟新,张庆珍..川东南涪陵地区五峰-龙马溪组硅质页岩的生物成因及其油气地质意义[J].石油实验地质,2016,38(4):460-465,472,7.基金项目
国家自然科学基金（ U1562106）和中国石化科技部项目（ P15097）资助。 （）
