− | | Petroleum is displaced from the [[trap]] at the [[spill point]] as the pore volume within the structural closure decreases. If [[porosity]] is lowered sufficiently, the accumulation may be subeconomic in size. | + | | Petroleum is displaced from the [[trap]] at the [[spill point]] as the pore volume within the structural closure decreases. If [[porosity]] is lowered sufficiently, the [[accumulation]] may be subeconomic in size. |