Porosity may be classified according to the mode of origins ( 1 ) original and ( 2 ) induced 按其原始形态，孔隙度可分为原牛孔隙度和次生孔隙度。
2.
Rocks having original porosity are more uniform in their characteristics than those rocks in which a large part of the porosity is induced 具有原生孔隙度的岩石比次生孔隙度占大部分的岩石在性质上更具有一致性。
3.
Induced porosity is typified by fracture development as found in some shales and limestones and by the rugs or solution cavities commonly found in limestones 次生孔隙度是以某些页岩和石灰岩的裂缝和石灰岩中的岩穴和溶洞为代表。
