焦石坝五峰组-龙马溪组页岩硅质生物成因的证据及其地质意义

以页岩露头样品和钻井岩屑样品元素测量结果为依据,结合岩心和薄片观察,分析焦石坝五峰组-龙马溪组页岩的硅质生物成因的证据,并探讨其地质意义。结果表明：焦石坝五峰组—龙马溪组页岩中存在大量的笔石、角石、珊瑚等古生物化石和放射虫微体生物化石;SiO2含量介于40%-80%,平均达63%;过量硅含量为2.6%-55.31%,其中五峰组和龙马溪组页岩下段过量硅含量较高,平均分别为41.3%和25.5%;Al/（Al＋Fe＋Mn）值介于0.62-0.87,与纯生物成因硅质岩相近,Al-Fe-Mn三角图上,研究区页岩样品绝大部分落在生物成因区,表明页岩硅质成分属于生物成因;深水陆棚贫氧、缺氧沉积环境有利于页...

Full description

Saved in:
Bibliographic Details
Published in中国石油大学学报（自然科学版） Vol. 41; no. 1; pp. 34 - 41
Main Author 刘江涛 李永杰 张元春 刘双莲 蔡英杰
Format Journal Article
LanguageChinese
Published 页岩油气富集机理与有效开发国家重点实验室,北京100101 2017
中石化石油工程技术研究院,北京100101
Subjects
五峰组-龙马溪组
地质意义
焦石坝
硅质生物成因
页岩
shale
地质意义
biogenic silica
Wufeng-Longmaxi Formation
Jiaoshiba area
页岩
焦石坝
硅质生物成因
五峰组-龙马溪组
geological significance
Online AccessGet full text
ISSN1673-5005
DOI10.3969/j.issn.1673-5005.2017.01.004

Cover

More Information
Summary:以页岩露头样品和钻井岩屑样品元素测量结果为依据,结合岩心和薄片观察,分析焦石坝五峰组-龙马溪组页岩的硅质生物成因的证据,并探讨其地质意义。结果表明：焦石坝五峰组—龙马溪组页岩中存在大量的笔石、角石、珊瑚等古生物化石和放射虫微体生物化石;SiO2含量介于40%-80%,平均达63%;过量硅含量为2.6%-55.31%,其中五峰组和龙马溪组页岩下段过量硅含量较高,平均分别为41.3%和25.5%;Al/（Al＋Fe＋Mn）值介于0.62-0.87,与纯生物成因硅质岩相近,Al-Fe-Mn三角图上,研究区页岩样品绝大部分落在生物成因区,表明页岩硅质成分属于生物成因;深水陆棚贫氧、缺氧沉积环境有利于页岩有机质的富集和有机孔隙的发育,对于页岩天然裂缝的形成和后期人工压裂都具有重要意义。
Bibliography:LIU Jiangtao1,2, LI Yongjie1,2, ZHANG Yuanchun1,2, LIU Shuanglian1,2, CAI Yingjie1,2 （ 1. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Belting 100101, China; 2. SINOPEC Research Institute of Petroleum Engineering, Beifing 100101, China）
Based on the elemental content of the ground outcrop samples and the drilling cutting samples,combined with the observation of core and thin section,the evidences of biogenic silica of Wufeng-Longmaxi Formation shale in Jiaoshiba area were analyzed,and the geological significance was discussed as well.The results show that there are a lot of paleontological fossils,such as graptolite,oncoceras,coral,and a lot of microfossils,such as radiolarian,in Wufeng-Longmaxi Formation shale.The content of SiO2 is between 40% and 80%,about 63% on average.The content of the assess SiO2 is between 2.6% and 55.31%,and the contents in Wufeng Formation and the lower member of Longmaxi Formation shale are higher,which are up to 41.3% and 25.5% on aver
ISSN:1673-5005
DOI:10.3969/j.issn.1673-5005.2017.01.004