- 责任者：Tian Xingwang (China University of Mining and Technology ; Beijing 100083 ; China) ; Hu Guoyi
- 刊名：Natural Gas Geoscience
- 出版年：2013
- 卷期：24(5)
- 关键词：储集层 ; reservoirs ; 沥青 ; asphalt ; 四川盆地 ; Sichuan Basin
- 页码：p.982-990
- 图表：6 illus., 26 refs.
- 分类号：1003
- issnNo：ISSN1672-1926
- isbnNo：CN62-1177/TE
Through whole rock microscopic determination of reservoir bitumen samples from new drilling data of Leshan-Longnvsi Paleo-uplift area, a large number of reservoir bitumens are found in the Sinian Dengying Formation in the Leshan Longnvsi paleo-uplift area of Sichuan Basin. Combined with determina tion of bitumen reflectance, organic elemental analysis and carbon isotope analysis of these samples, the re suits show that： the equivalent vitrinite reflectance （Ro＇） of Dengying reservoir bitumen ranges from 2.06% to 3.0% ,with an average of 2.62% ,H/C and O/C atomic ratios are only 0.30-0.43 and 0.01-0.03, respectively,which reflect that the bitumen maturity is high,basically in the mature-overmature stage;S/C atomic ratio is only 0.03-0.06, and is somewhat low in comparison to reservoir bitumen from Changxing （P2ch） and Feixianguan（Tlf） Formations,which indicate that Dengying Formation reservoir bitumens in ancient uplift area were slightly affected by thermochemical sulfate reduction （TSR） ;the value of stable car- bon isotope is from-36.8‰ to -34.5‰ ,with an average of-35.7‰ ,which is the lowest compared with carbon iso- tope of kerogen and bitumen in each layer of Sichuan Basin, even lower than the carbon isotope of marine oil in Tar im Basin. Combined with the geological and tectonic background and carbon isotope of source rock kerogen in Si- chuan Basin,the reservoir bitumen in this area is epigenetic - reservoir bitumen, sourced from Lower Cambrian Qiongzhusi Formation,which belongs to thermal evolution bitumen-pyrobitumen of the ancient reservoir when it cracked into gas during deep burial under high temperature and pressure.