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Faults & Reservoirs (Essentials for Hydrocarbon field (Rock must be…

- - - - Volcanic rocks can have considerable primary porosity as a result of
        lava tunnels (large-scale) and vesicles (small-scale)
    - - most important
  - - - Matrix(little bits e.g mud)
        
        Cement - precipitated
        within the sediment.
        
        Voids (empty space)
        
        Fluids
- - - - oil water contact line moves down to the spill point
        
        Gas will also move upwards
        
        Oil is displaced
    - - The vertical distance between the top of the reservoir and the petroleum-water contact is the gross pay