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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2018  >  40(6): 836-842
ZHANG Hai, LEI Huawei, ZHANG Tao, BAI Yubin. Geochemical characteristics of Yan 9 crude oil and oil-source correlation in western Jingbian Oil Field, Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2018, 40(6): 836-842. doi: 10.11781/sysydz201806836
Citation: ZHANG Hai, LEI Huawei, ZHANG Tao, BAI Yubin. Geochemical characteristics of Yan 9 crude oil and oil-source correlation in western Jingbian Oil Field, Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2018, 40(6): 836-842. doi: 10.11781/sysydz201806836
shu

Geochemical characteristics of Yan 9 crude oil and oil-source correlation in western Jingbian Oil Field, Ordos Basin

doi: 10.11781/sysydz201806836

  • 1. Jingbian Oil Production, Yanchang Oil Field Corporation, Yulin, Shaanxi 718500, China;

  • 2. School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China;

  • 3. School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China

  • Received Date: 2018-04-16
  • Rev Recd Date: 2018-09-06
  • Publish Date: 2018-11-28
    Abstract
  • The geochemical characteristics of the Yan 9 reservoir were analyzed by means of petrophysical properties, hydrocarbon group composition, saturated hydrocarbon chromatography and gas chromatography-mass spectrometry in order to clarify the source of oil in the Yan 9 reservoir in the west of Jingbian Oil Field. The geochemical characteristics of Chang 7 source rocks in the study area and the Zhidan area were compared, and the source of Yan 9 oil was studied in combination with regional geological background. The results showed that the saturated hydrocarbon content of Yan 9 crude oil is above 60%, and the n-alkanes are distributed with a single mode with C21 as the main carbon peak, C30 hopane as the dominant biomarker, followed by C29 hopane. Regular steroids are mainly C29, while C27 and C28 are similar, showing an asymmetric "V" distribution. The Yan 9 crude oil has similar geochemical characteristics and unified material source and evolution degree. It is a mature crude oil derived from a source deposited in a weak oxidation-reduction environment under freshwater conditions. Oil-source correlation showed that the source rocks of the Chang 7 reservoir in the Jingbian Oil Field are related to the Yan 9 crude oil, and the geochemical characteristics of the Chang 7 source rocks in the Zhidan area, which is located in the center of the lacustrine basin, are obviously different from the Yan 9 crude oil. The formation of Yan 9 oil is mainly due to the maturation of Chang 7 source rocks in this area. The oils were transported by superimposed sand bodies and fracture systems, migrated vertically to the Yan 9 reservoir, and then migrated laterally to traps for accumulation.

     

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