- 责任者：Li Rongxi (Key Laboratory of West Mineral Resource and Geology Engineering ; Ministry of Education ; Chang’an University ; Xi’an 710054 ; China) ; Deng haiqing
- 刊名：Chinese Journal of Geology
- 出版年：2013
- 卷期：48(4)
- 关键词：高压 ; high pressure ; 油气运移 ; oil and gas migration ; 鄂尔多斯盆地 ; Ordos Basin
- 页码：p.1219-1233
- 图表：9 illus., 1 table, 40 refs.
- 分类号：1003
- issnNo：ISSN0563-5020
- isbnNo：CN11-1937/P
Abundant primary boiling oil inclusions were found contained in calcite veins filled in fractures cutting through compacted fine grain sandstone of Chang 7 and Chang 8 section of Upper Triassic Yangchang Formation in Ordos Basin in centre of north China. Petrography, microthermometry and organic geochemistry of oil inclusions were studied and were correlated with crude oil from Chang 8 and source rocks of Chang 7. Two-phase and three-phase oil inclusions with extremely variable gas/liquid ratios were coeval with one-phase pure oil inclusions. Characteristics of oil inclusions indicate that they have been trapped simultaneously in a case of heterogeneous of liquid oil and vapor at boiling state during the period of calcite filling fractures. Measured Th of oil inclusions ranged from 74 ℃ to 117 ℃ which are correlatedwith thermal maturated degree indicated by fluoresce of bright yellow color and fluorescent spectra indexes of oil inclusions themselves and that of source rocks of Chang 7. Results of organic geochemistry studies suggest that oil inclusion and crude oil of Chang 8 derived from the same source rocks of Chang 7. It indicates that oil expelled from source rocks of Chang 7 and migrated into compacted sandstone reservoir with very low permeability at boiling state caused by fracturing under over-pressure due to expanding of accumulated oil generated from thick mudstone and oil shale of source rocks of Chang 7, or because of release of loadage of Upper Cretaceous-Paleocene sediments due to intense uplifting of Ordos Basin after Later Cretaceous when large scale oil generation had taken place.