Shale oil resource evaluation with an improved understanding of free hydrocarbons:Insights from three-step hydrocarbon thermal desorption
作者机构：Cooperative Innovation Center of Unconventional Oil and GasYangtze University(Ministry of Education&Hubei Province)Wuhan 430100China Hubei Key Laboratory of Petroleum Geochemistry and EnvironmentYangtze UniversityWuhan 430100China Research Institute of Petroleum Exploration and DevelopmentPetroChinaBeijing 100083China School of Energy and ResourcesChina University of GeosciencesBeijing 100083China Suzhou Grand Energy Technology Co.LtdSuzhou 215129China
出 版 物：《Geoscience Frontiers》 (地学前缘(英文版))
年 卷 期：2023年第14卷第6期
页 面：464-477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] 0704[理学-天文学]
基 金：This study is financially supported by the National Natural Science Foundation of China(Grant Number 41972122,42172139 and 42072186) the China Scholarship Council(CSC),the Open Foundation of Cooperative Innovation Center of Uncon-ventional Oil and Gas,Yangtze University(Ministry of Education&Hubei Province)(Grant Number UOGBX 2022-03) Petro-China Innovation Found(No.2020D-5007-0101)
主 题：Shale oil Hydrocarbon thermal desorption Resource evaluation Component Microscopic occurrence feature
摘 要：The pyrolysis parameter S1,which indicates the amount of free hydrocarbons present in shale,is often underestimated due to hydrocarbon loss during sample handling and measurement *** remedy this issue,we strongly recommend an immediate three-step hydrocarbon thermal desorption(HTD)approach to be conducted on oil shale at the drilling *** approach measures S_(g),S_(O),and S_(1)^(*),which refer to gaseous,light,and free hydrocarbons,*** new shale oil content value,calculated from the total of these three parameters,is far more precise and reliable than traditional pyrolysis ***,we thoroughly investigated the components and microscopic occurrence features of hydrocarbons thermally desorbed at three temperature stages using gas chromatography(GC)and X-ray microcomputed tomography(CT).For example,we selected Chang 7_(3)mud *** experimental results irrefutably indicate that the ultimate shale oil content of poor resource rocks is significantly impacted by evaporative loss,with this effect being greater when the total organic carbon(TOC)is ***,C_(1-5)and C_(1-7)hydrocarbons constitute almost all of S_(g)and S_(O),respectively.S_(g)and S_(O)are predominantly composed of C_(1-3)gaseous hydrocarbons,with a maximum proportion of 42.93%.In contrast,S_(1)^(*)contains a substantial amount of C_(16-31)hydrocarbons.A three-dimensional reconstruction model of an X-ray micro-CT scan shows that while the amount of shale organic matter greatly decreases from the frozen state to 300℃,the pore volume significantly increases,particularly between 90 and 300℃.The increased pore volume is mainly due to macropores and *** is imperative to note that the shale oil triple-division boundaries must be adjusted based on more accurate oil content,although this would not affect the resource zones to which the samples already belong(ineffective,low-efficient,and enriched resources).In conclusion,we strongly advise conducting an immediat
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