咔唑、酚类和二苯并噻吩类化合物在油气运移研究中的应用

doi:10.11743/ogg20080123

Abstract

Abstract:

Chemicals,such as Cabazoles,phenols and dibenzothiophenes,in oils and source rocks may serve as ideal tools for hydrocarbon migration researches.Alkylated carbazoles concentration and shield and semi-shield isomersexposed isomers ratios and benzocarbazole [a]/([a]+[c]) ratios are considered perfect indexes for migration.However,the distribution of these chemicals may be affected by input of organic matters,depositional environment,thermal maturity,primary and secondary migration,and biodegradation.For example,different environments may lead to different distribution of carbazoles,and carbazole migration parameters may increase with maturity increasing at low maturity environment but decrease in a highly matured environment,reducing the reliability of these parameters as the indexes of hydrocarbon migration.Alkylated phenols concentration may serve as migration index but it also affected by many other factors such as sedimentary facies,environments,maturity,and biodegradation.The parameters of alkyldibenzothiophenes of cogenetic oil such as 4-/1-MDBT,2,4-/1,4-DMDBT and 4,6-1,4-DMDBT can fit as migration indexes for oils with different maturity,biodegraded oils,and mixed cogenetic oils of two separated charges,thus can serve as excellent tools for migration direction assessment.It is also suggested that many other factors shall be taken into consideration when molecular geochemistry parameters of crude oils and source rocks are used to trace hydrocarbon migration since these parameters are easily affected by changes in maturity,facies and depositional environment in rifted-basins.

Key words: carbazole, alkylphenol, methyldibenzothiophene(MDBT), dimethyldibenzothiophene(DMDBT), hydrocarbon migration

CLC Number:

TE122.1

Zhou Shuqing, Huang Haiping, Xu Xuhui, Zhu Jianhui, Liu Yuming. Application of cabazoles,phenols and dibenzothiophenes indexes in hydrocarbon migration research[J]. Oil & Gas Geology, 2008, 29(1): 146-150,156.

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Application of cabazoles,phenols and dibenzothiophenes indexes in hydrocarbon migration research

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