西安石油大学学报（自然科学版）2016，Vol.31Issue(2)：18-24,7.DOI:10.3969/j.issn.1673-064X.2016.02.003
涪陵焦石坝地区五峰组-龙马溪组页岩古氧相研究
Study on Paleo-redox Conditions of Wufeng Formation-Longmaxi Formation Shale in Fuling Jiaoshiba Area
摘要
Abstract
The development effect of the lower member of the Wufeng Formation-Longmaxi Formation shale is different from that of the upper member of Longmaxi Formation shale. In order to find the cause of the difference,the Paleo-redox conditions of Wufeng Forma-tion-Longmaxi Formation shale are studied based on the analysis of geochemical characteristics and the sedimentary and palaeoecologi-cal data from Late Ordovician to Early Silurian. It is shown that in the lower member of Wufeng Formation-Longmaxi Formation,the con-tent of Fe and Mn is low,the content of U is high,the ratio of U to Th is greater than 0. 75,the mass fraction of U is greater than 5 × 10 -6 ,biological fossils and deposited layers are well preserved,there is typical poor oxygen-anaerobic environment,which is favorable to the enrichment and preservation of biological remains,and therefore organic matter content is high. In the upper member of Longmaxi Formation shale,with the increase of depth,the content of Fe and Mn is decreasing,the content of U and S is increasing,the reduction of sedimentary water is increasing;the content of S is positively correlated with the content of TOC. The upper part of the formation is a typical oxygen enriched sedimentary environment,in which biological remains are difficult to preserve and the content of TOC is low;the lower part of the formation is the transitional sedimentary environment from poor oxygen to rich oxygen,the content of TOC is high,so there is a certain exploration potential. The difference of the Paleo-redox environment is the basic reason for the quality difference of the two kinds of shale.关键词
页岩/古氧相/沉积环境/五峰组-龙马溪组/焦石坝Key words
shale/Paleo-oxygenation facies/sedimentary environment/Wufeng Formation-Longmaxi Formation/Jiaoshiba area分类
能源科技引用本文复制引用
刘江涛,卢坤辉,蔡英杰,李永杰,刘双莲..涪陵焦石坝地区五峰组-龙马溪组页岩古氧相研究[J].西安石油大学学报（自然科学版）,2016,31(2):18-24,7.基金项目
中国石化重点科技攻关项目“页岩地层工程特性测井评价技术研究” （）
