Lithologic Reservoirs ›› 2013, Vol. 25 ›› Issue (3): 43-47.doi: 10.3969/j.issn.1673-8926.2013.03.007

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Formation and evolution of the reef flat facies lithologic gas reservoir of Changxing Formation in Yuanba Gas Field, Sichuan Basin

DUAN Jinbao1， LI Pingping2， CHEN Dan1， FENG Chong2   

  1. 1. Research Institute of Southern Exploration Company， Sinopec， Chengdu 610041， China； 2. College of Geosciences，China University of Petroleum， Beijing 102249， China
  • Online:2013-06-01 Published:2013-06-01

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Abstract:

The origin, source and evolution of the reef flat facies lithologic gas reservoir of Changxing Formation in Yuanba Gas Field were studied systematically by themethods of geologic and geochemical inversion. The result shows that the gas of the reel flat facies lithologic gas reservoir is mainly from the oil cracked gas of paleo-reservoir, and a small part of the gas is directly from the source rock of Upper Permian. During Late Triassic-Early Jurassic, crude oil migrated to reservoir along the interlayer fractures and joint fissures, and formed paleo-reservoir. During Late Jurassic-Late Cretaceous, the paleoreservoir cracked, gas migrated along fractures and pore reservoir and accumulated, and formed paleo-gas reservoir. Since Late Cretaceous, gas further migrated and formed the present gas reservoir. The gas reservoir experienced physical adjustment and chemical alteration of natural gas component. Small amplitude of uplift in the northwestern Yuanba Gas Field leads to the relatively shallow burial depth and the weak TSR response.

Key words: time-frequency analysis, spectral decomposition, spectral inversion, frequency splitting processing, seismic exploration

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