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Oil and Gas, Generation of non-hydrocarbon gases, Emplacement - Coggle…

- - - - leakage, seepage, dissipation and alteration
      - different is rate of petroleum supply
      - movement of previous formed oil/gas
      - direction of tertiary migration
        
        vertical
        
        horizontal
        
        combination of both
      - Buoyancy driven
    - - expulsion is upward except if pressure differ can overcome buoyancy
      - transport mechanism carry HC
        
        diffusion
        
        molecular soution oil phase and gas phase migration
    - - movement of pet through permeable layer
      - from few feet to hundred miles or kilometres
      - Carrier bed to trap
      - in continuous sand, fractures, faults, unconformities, permeable carbonate
        
        until encountered
        
        seal
        
        cap rock
        
        permeability barrier
      - Buoyancy driven
    - - Fine grained (source rock)
      - Coarse grained ( reservoir rock)
      - distance is short
      - reach permeable bed
      - pressure driven
- - - - can be exploited by human