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根据盖层封盖机理与岩石孔隙结构的关系，把盖层分为微孔型和微缝型两类。微孔型盖层饱压比值曲线呈单峰态，峰值他压比大于３．０×１０－２ＭＰａ－１，多位于中浅层（源岩生油窗之上），不仅构成油气的直接盖层，而且与流体高能面配合，能形成高效的区域盖层。微缝型盖层由微孔型盖层演化而来，饱压比值曲线具多峰态，峰值他压比小于３．０×１０－２ＭＰａ－１，多位于中深层（源岩生油窗之下），主要起直接盖层作用，作为区域盖层则效率较低。
According to the relationship between the cap capping mechanism and the rock pore structure, the capping layer is divided into two types: micropore type and micro-seam type. The pressure saturation curve of microporous cap was monomodal with peak pressure ratio greater than 3.0 × 10-2MPa-1, mostly located in the medium-shallow layer (source rock oil window), which not only formed the direct caprock of oil and gas , But also with the high energy surface of the fluid to form a highly effective cap area. Microtech cap rocks evolve from microporous cap rocks, and the saturation pressure ratio curve has a multi-peak state. The peak pressure ratio is less than 3.0 × 10-2MPa-1, mostly located in the middle and deep layers ), The main direct cover, as the cover is less efficient.