Introducing a Novel Approach for Oil-Oil Correlation based on Asphaltene Structure: X-ray Diffraction  

作　　者：Zahra SADEGHTABAGHI Ahmad Reza RABBANI Abdolhossein HEMMATI-SARAPARDEH 

机构地区：[1]Department of Petroleum Engineering,Amirkabir University of Technology,Tehran,Iran [2]Department of Petroleum Engineering,Shahid Bahonar University of Kerman,Kerman,Iran [3]Institute of Research and Development,Duy Tan University,Da Nang 550000,Vietnam [4]Faculty of Environmental and Chemical Engineering,Duy Tan University,Da Nang 550000,Vietnam

出　　处：《Acta Geologica Sinica(English Edition)》2021年第6期2100-2119,共20页地质学报（英文版）

摘　　要：Asphaltenes have always been an attractive subject for researchers.However,the application of this fraction of the geochemical field has only been studied in a limited way.In other words,despite many studies on asphaltene structure,the application of asphaltene structures in organic geochemistry has not so far been assessed.Oil-oil correlation is a wellknown concept in geochemical studies and plays a vital role in basin modeling and the reconstruction of the burial history of basin sediments,as well as accurate characterization of the relevant petroleum system.This study aims to propose the Xray diffraction(XRD)technique as a novel method for oil-oil correlation and investigate its reliability and accuracy for different crude oils.To this end,13 crude oil samples from the Iranian sector of the Persian Gulf region,which had previously been correlated by traditional geochemical tools such as biomarker ratios and isotope values,in four distinct genetic groups,were selected and their asphaltene fractions analyzed by two prevalent methods of XRD and Fouriertransform infrared spectroscopy(FTIR).For oil-oil correlation assessment,various cross-plots,as well as principal component analysis(PCA),were conducted,based on the structural parameters of the studied asphaltenes.The results indicate that asphaltene structural parameters can also be used for oil-oil correlation purposes,their results being completely in accord with the previous classifications.The average values of distance between saturated portions(d_(r))and the distance between two aromatic layers(d_(m))of asphaltene molecules belonging to the studied oil samples are 4.69Aand 3.54A,respectively.Furthermore,the average diameter of the aromatic sheets(L_(a)),the height of the clusters(L_(c)),the number of carbons per aromatic unit(C_(au)),the number of aromatic rings per layer(R_(a)),the number of sheets in the cluster(M_(e))and aromaticity(f_(a))values of these asphaltene samples are 10.09A,34.04A,17.42A,3.78A,10.61Aand 0.26A,respectively.The results of XRD para

关 键 词：oil-oil correlation petroleum characterization X-ray diffraction Fourier-transform infrared spectroscopy decision tree classification 

分 类 号：P618.13[天文地球—矿床学]