| 王宁,许锋.陕南镇巴地区牛蹄塘组页岩沉积环境分析[J].矿产勘查,2019,(8):1764-1774 |
| 陕南镇巴地区牛蹄塘组页岩沉积环境分析 |
| Study of Sedimentary Environment of the Niutitang Formation Shale in Xixiang-Zhenba Area, Shaanxi |
| 投稿时间：2019-03-12 |
| DOI： |
| 中文关键词: 西乡-镇巴 牛蹄塘组 沉积环境 主量元素 微量元素 |
| 英文关键词: Xixiang-Zhenba area,the Niutitang formation, sedimentary environment, major elements,trace elements |
| 基金项目:西省公益性地质(编号:20170104)资助。 |
|
| 摘要点击次数: 1992 |
| 全文下载次数: 141 |
| 中文摘要: |
| 页岩的形成环境对于页岩储层评价和甜点预测具有重要意义。文章应用元素地球化学分析方法探讨陕西西乡—镇巴地区牛蹄塘组页岩沉积环境。①B含量和Sp值、Fe2O3/TiO2-Al2O3/(Al2O3+Fe2O3)图解、MnO/TiO2均指示牛蹄塘组沉积于大陆边缘浅海环境；② Sr/Cu、CIA和高BaXS均反映该区牛蹄塘组沉积期间气候温暖湿润,生物繁盛,水体古生产力高；③V/Cr、V/(V+Ni)、Ni/Co、Th/U、δU及草莓状黄铁矿富集表明牛蹄塘组页岩在缺氧的还原条件下沉积；④红柱石晶体、SiO2/Al2O3比值及高丰度Mo、V表征牛蹄塘组页岩硅质矿物除陆源碎屑外,大部分为生物成因,仅在地层底部有少量热液成因硅。 |
| 英文摘要: |
| The sedimentary environment of the shale is of great significance for shale reservoir evaluation and sweet spot. In this paper, the elemental geochemical analysis method is used to investigate the sedimentary environment of the Niutitang Formation in the Xixiang-Zhenba area of Shaanxi Province. ①The value of B and Sp, Fe2O3/TiO2-Al2O3/( Al2O3+Fe2O3) diagrams, MnO/TiO2 indicate the Niutitang Formation deposit in continental margin shallow sea environment; ②Sr/Cu, CIA and high BaXS reflect that in the period of Niutujitang , research area is warm and humid, and the ancient productivity is high with organism flourishing; ③V/Cr, V/(V+Ni), Ni/Co, Th/U, δU, and the enrichment of strawberry-like pyrite indicate that the Niutitang Formation shale deposit under the conditions of anoxic reduction; ④Andalusite crystals, SiO2/Al2O3 ratio and high content of Mo, V reveal that the siliceous minerals originate, besides terrigenous debris, biogenic reasons mostly, and a small amount of hydrothermal silicon only at the bottom of the strata. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|