... anticlines ( FigureFigure 1 1, (a )) , only a vertical seal, , (a )) , only a vertical seal, or or caprockcaprock, is required; but faults ( , is required; but faults ( FigureFigure 1 1, (b )) and ... faults ( FigureFigure 1 1, (b )) and , (b )) and stratigraphicstratigraphictraps ( traps ( FigureFigure 1 1, ( , ( c,dc,d )) must be sealed both )) must be sealed both vertically and ... different(micro and macro) scales.THICKNESSTHICKNESS° A few inches of ordinary clay shale are theoretically adequate to trap very large column heights of hydrocarbons (particle size of 1 0-4 mm...