西南石油大学学报(自然科学版)

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Mature and Hydrocarbon Generation-expulsion Histories of Terrestrial
Faces Source Rock in Sichuan Basin

Feng Dongjun1,2*, Xiao Kaihua1,2   

  1. 1. School of Earth and Resources,China University of Geoscience(Beijing),Haidian,Beijing 100083,China
    2. Exploration and Production Research Institute,SINOPEC,Haidian,Beijing 100083,China
  • Online:2015-04-01 Published:2015-04-01

Abstract:

In order to evaluate terrestrial faces source rock in Sichuan Basin,we quantitatively recovered the mature and hydrocarbon
generation-expulsion histories of the main hydrocarbon source in research area by the numerical simulation technology
of oil and gas bearing basin. First,we established the thermodynamic,hydrocarvon-generation dynamic model,mechanism
and geologic model of the basin. Then,we simulated more than 20 wells in the important areas of the basin with ancient
heat flow,sediment water interface and paleobathymetric data being input parameters. The results show that terrestrial faces
source rock in Sichuan Basin have three hydrocarbon-generation peaks and two hydrocarbon-expulsion peaks. The character of
mature and hydrocarbon-generation histories can be summarized as subregion evolution,diversity maturation and west earlier
than east. The quantity of hydrocarbon generation-expulsion in Segment 3 and 5 Xujiahe Formation is that in lower Jurassic
and 3 segment Xujiahe Formation. Total hydrocarbon-expulsion efficiency in 1 and 5 segment Xujiahe Formation is higher
than that of others. The quantity of hydrocarbon-generation in western Sichuan is the biggest in Sichuan Basin,followed by
that in northern – northeastern and middle Sichuan. The conclusion is that the areas of hydrocarbon source rock for oil and gas
system in Xujiahe Formation and in middle-lower Jurassic are major targets in gas exploration in western Sichuan region and
northern-northeastern Sichuan Basin.

Key words: Sichuan Basin, Xujiahe Formation, Jurassic, hydrocarbon source rock, mature history, hydrocarbon-generation
history,
hydrocarbon-expulsion history