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- W2359796898 abstract "The physical and chemical nature of petroleum changes with source rock and maturity,although the feature of oil and gas can also be influenced by local biodegadration or water washing.During the process of reservoir filling,some polar compound in crude oils,such as carbazoles which can interact relatively strongly with water,rock minerals and each other,and thus induce hetrogenous petroleum.Meanwhile, heterogenous migration pathways also influence the characteristics of oils. In the paper,authors discuss in detail the chemical nature of oil samples,which come from six oil fields in Jiuxi Basin.Among twelve oil samples,except one sample′s carbon isotope(δ 13 C oil ‰) of the whole liquid hydrocarbon (crude oil) is -30.5‰,the other′s is about -31‰,whose absolute error is less than 0.2‰.Distillation mode of carbon isotope of N alkane element series is also similar to each other.Based on GC and GC MS analysis,seventeen conventional geochemical parameters are selected to calculate correlation coefficients between twelve oil samples,correlation coefficients of all samples are more than 0.86,most of them is up to 0.96.All of these parameters show that twelve oil samples come from the same source rock. Two star diagrams (multivariable plots in polar coordinates) have been developed to assess subtle chemical differences among oils.The diagrams are based on analysis of C 7 hydrocarbon of crude oils separated by gas chromatography.The first C 7 diagrams is used for distinguishing variation in oils caused by transformation,e.g. water washing,biodegradation and evaporation. The second C 7 based diagram consists of four ratios composed of compounds that are very resistant to the effects of transformation.Two star diagrams of six oils representing different oil fields show water washing,biodegradation and other transformations are not the main factors to control heterogenous petroleum.Either is maturity,based on the molecular isomerization parameters of C 29 ααα sterane 20S/(20S+20R) as maturity parameter. At the end of the paper,pyrrolic nitrogen compound distrbutions of crude oil are studied.Pyrrolic nitrogen compounds in oil have been shoun to be very useful geotracers in predicting the direction and even the distance of oil secondary migration in the reservoirs.Alkylcarbazole series in the neutral pyrrolic nitrogen are just discussed,1,8 dimethylcarbazole/3,4 dimethylcarbazole,1,8 dimethylcarbazole/1,3 dimethylcarbzole,carbazole/methylcbazole and methylcarbazole/dimethylcarbzole are used as migration parameters.These parametes of different crude oils with similar other parameters have some changes.It is concluded that migration fractionation is the main factor to control heterogeneity of petroleum in Jiuxi Basin.At the same time,migration parameters verify that oils come from Qingxi sag and the direction of migration is from west to east." @default.
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- W2359796898 date "2000-01-01" @default.
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- W2359796898 title "Controls on Compositional Heterogeneity of Oils in Jiuxi Basin" @default.
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