A New Method for Semi-quantitative Analysis of Amorphous SiO2 in Terrestrial Shale:A Case Study about Yanchang Formation Shale,Ordos Basin

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  • State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China

Received date: 2015-03-26

  Revised date: 2015-04-23

  Online published: 2015-11-10

Abstract

Yanchang Formation shale of Ordos Basin contains a certain amount of amorphous SiO2,which has been proved by SEM observation and X-ray diffraction analysis of bulk rock.The three methods proposed by now to calculate the quantity of amorphous SiO2 have their own flaws.The disadvantages of chemical denudation are experimental period and unconvinced accuracy because of dissolving other minerals.Quantitative analysis of amorphous silica by X-ray diffraction possesses high personal error on the integrated intensity of dome-shaped scattering curve in XRD spectrum of amorphous SiO2.The doping method has high deviation and needs to compound standard sample,while some kinds of pure minerals are hard to obtain.On the basis of summarizing previous researches,a new method that combines QEMSCAN and XRD is proposed for the issue of amorphous SiO2 calculation in multiphase system.The new method avoids the flaws in approaches which have been proposed,and calculates the amount of amorphous SiO2 indirectly according to the quantities of quartz and SiO2 measured respectively.

Cite this article

HUANG Zhi-long,LIU Guo-heng,MA Jian,XUE Dong-qing,HAN Wei,CHEN Jin-long,CHEN Zhi-yuan . A New Method for Semi-quantitative Analysis of Amorphous SiO2 in Terrestrial Shale:A Case Study about Yanchang Formation Shale,Ordos Basin[J]. Natural Gas Geoscience, 2015 , 26(11) : 2017 -2028 . DOI: 10.11764/j.issn.1672-1926.2015.11.2017

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