Origin,Distribution and Geochemical Significance of Isopropyltoluene Isomers in Crude Oil

作     者：Bingkun Meng Daofu Song Yuan Chen Shengbao Shi Shixin Zhou Bingkun Meng;Daofu Song;Yuan Chen;Shengbao Shi;Shixin Zhou

作者机构：Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Petroleum Resources and ProspectingCollege of GeosciencesChina University of PetroleumBeijing 102249China 

出 版 物：《Journal of Earth Science》 (地球科学学刊（英文版）)

年 卷 期：2022年第33卷第1期

页      面：215-228页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0708[理学-地球物理学] 0818[工学-地质资源与地质工程] 

基　　金：supported by the National Science and Technology Major Project(No.2016ZX05003-002-004) the National Natural Science Foundation of China(Nos.41072105,41872147,41503029) the National Key Research and Development Program of China(No.2017YFC0603102) 

主　　题：organic carbon GC×GC-TOFMS light oils and condensates organic matter origin 

摘      要：With comprehensive two-dimensional gas chromatography linked to time-of-flight mass spectrometry(GC × GC-TOFMS),ten light hydrocarbon(LH) compounds were qualitatively and quantitatively studied in light hydrocarbons(LHs) components of crude *** significant differences in the concentrations of 3-isoproyltoluene(3-iPT),4-isoproyltoluene(4-iPT) and 2-isoproyltoluene(2-iPT) in crude oils,and the 2-iPT probably derived mainly from similar skeleton monocyclic terpenoids via dehydrogenation and aromatization,the ratios of(3+4)-/2-iPT(iPTr),3-/2-iPT(iPTr1) and 4-/2-iPT(iPTr2) are proposed to distinguish the organic matter origin of crude *** higher iPTr(8.0),iPTr1(7.0) and iPTr2(4.0) values indicate that crude oils are sourced from the co-contribution of lower aquatic organisms,bacteria,algae,and terrestrial higher plants,whereas lower iPTr(5.0),iPTr1(3.0),iPTr2(2.0) values suggest that crude oils originated from terrestrial higher *** iPTr,iPTr1,and iPTr2 values show notable distinction which is mainly controlled by 2-iPT concentrations,while the concentrations of 3-iPT and 4-iPT have similar distribution range in all studied *** 2-iPT depleted in marine oils from the Tarim Basin and lacustrine oils from the Beibuwan Basin is less than 0.30 mg/g LHs,whereas 2-iPT enriched in swamp oils from the Tarim Basin is greater than 0.50 mg/g *** iPTr,iPTr1,and iPTr2 ratios and 2-iPT concentrations can be used to distinguish the organic matter origin of crude oils,especially for light oils and condensates with low concentrations of biomarkers.