Lithologic Reservoirs ›› 2009, Vol. 21 ›› Issue (1): 6-10.doi: 10.3969/j.issn.1673-8926.2009.01.002

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Downward migration of oil and gas can not occur

LI Chuanliang   

  1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Southwest Petroleum University， Chengdu 610500， China
  • Online:2009-03-16 Published:2009-03-16

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Abstract:

The downward migration of oil and gas is studied. Oil and gas migrate upward or upward laterally due to buoyancy of water. The downward migration of oil and gas can not occur forever. This wrong understanding comes from the concept of undercompaction of rock. Undercompaction is a wrong concept, which is resulted from the misunderstanding of rock deformation. It is wrong using equivalent depth method to calculate the pore pressure. Faults are not the path of downward migration of oil and gas. Without the driving force, the downward migration of oil and gas take place impossibly.

Key words: ultra-low permeability reservoir, starting pressure gradient, Houshi area, Ordos Basin

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