2015年9月，第21卷，第3期，470-000页 September 2015, Vol.21, No.3, pp. 470000
D0I: 10.16108/j.issn10067493.2015023
高校地质学报
Geological Journal of China Universities
陆相页岩非晶态二氧化硅定量分析新方法探索
刘国恒，高满玉，陈常超
中国石油大学油气资源与探测国家重点实验室，北京102249
捕要：通过扫描电镜观繁和全岩矿物X衍射实验图谱分析发现，鄂尔多斯盆地延长组页岩申含有一定量的非晶态二氧化硅。现有的三种计算非晶态二氧化硅含量的方法都有一定的缺陷：化学溶解方法分析周期长、且对其他矿物有一定程度的溶解；X衍射定量分析法需要计算非晶态二氧化硅衍射图谱上因丘散射曲线的积分强度，人为误差较高；增量法标样难以配制，而且误差较高。在总结前人研究的基础上，提出了X衍射与微区矿物定量分析相结合的方法来解决计算多相体系中非晶态二氧化硅含量这一间题。该方法避开了前人所提出方法的缺点，分别计算得到了结晶态石英含量与二氧化硅含量，
从而间接计算出非晶态二氧化硅含量，然而超高的实验成本也成为该方法在现阶段难以普及的主要原因。关键词：扫描电镜；微区矿物定量分析；非晶态二氧化硅；X衍射；鄂尔多斯盆地
中图分类号：TE122.1
文献标识码：A
文章编号：10067493（2015）03-047107
TestingaNewMethodforQuantitativeAnalysisof
AmorphousSiOinTerrestrialShale
LIU Guoheng, GAO Xiaoyu, CHEN Changchao
State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China
Abstract: The Yanchang Formation shale of Ordos Basin contains a certain amount of amorphous SiO, which is proved by SEM observations and X-ray diffraction analyses of bulk rocks. Three methods proposed to calculate the quantity of amorphous SiO, have their own flaws. The disadvantagrs of chemical denudation are experimental period and dissolution of other minerals. XRD quantitative analysis possesses high personal errors in the integrated intensity of dome-shaped seattering curves in XRD speectrum of amorphous SiO, The doping method has high deviation and needs to compound standand sample, On the hasis of summarizing previous researches, a new method that combines QEMSCAN and XRD is proposed for calculating the amorphous SiO; in a multiphase system. The new method avoids the flaws in the three approaches, and calculates the amount of amorphous SiO, indireetly according to the quantities of quartz
and SiO, measured, respectively. However, super high experimental cost is the main factor to limit the method for wide use. Key words: SEM; QEMSCAN; amorphous SiOs XRD; Ordos Basir
First author: LIU Guogheng, Ph. D. Candidate; E-mail: liuguoheng123@sina.cn
美国页岩气勘探和开发的成功促进了中国页岩气的发展。目前，我国在四川盆地南部古生界和北部中生界的富有机质黑色页岩中取得重要的页岩气突破。同时，针对鄂尔多斯盆地也开展了
收稿日期：20150206；修回日期：20150429
页岩油气的评价和钻探工作，取得了初步认识（邹才能等，2013）。鄂尔多斯盆地是我国陆相页岩研究的典型靶区，国内众多的学者已经从页岩储层物性、储集空间及吸附特征等角度对此进行
基金项目：国家自然科学基金项目“湖相富有机质配页若自生石英形成及其页岩油地质意义”（41272156）资助作奢筒介：刘国恒，男，1988年生，博土生，从事油气蒙形成与分布研究；E-mail:liaguoheng123@sina.cn