古龙页岩亚微米级孔隙中原油密度与分布的原位定量观测方法OA

In order to identify the distribution of light oil in Gulong shale,laser scanning confocal freezing observa-tion technology is used to systematically analyze oil samples from Songliao Basin.The relationship between R/G in-tensity ratio of reflection light-long/shortwave fluorescence multiple scanning images and oil density is established,as well as an in-situ observation method for light oil,medium oil and heavy oil components(including heavy oil,resin asphaltene and hydrocarbon-generating parent material)in Gulong shale.The results show that shale oil in Qingshankou Formation of Well S18 in Gulong Sag of Songliao Basin mostly presents to be irregular,patchy and sporadic.The content of light oil is significantly higher than that of medium oil and heavy components,with an aver-age area ratio light/(medium+heavy)oil up to 8.6.In observed well intervals,light oil is mainly enriched in lami-nated-layered shale.Based on the area ratio distribution of light oil and the light/(medium+heavy),reservoir mem-bers are evaluated.In general,Q9 reservoir member in this well is superior to Q6-Q7 reservoir members,and Q6-Q7 reservoir members are superior to Q1-Q2 reservoir members.Systematic observation and study of the distribution of light oil in the shale provide new important basis for optimizing exploration and development targets and selecting fracturing horizontal well intervals.