储层预测范围内渗透性砂层的预测是一个研究较少，难度较大但又不是油气勘探中急需解决的课题。
In the reservoir prediction, the prediction of permeable sands is studied fairly little and has considerable difficulty, but is a problem badly in need of being solved in reservoir exploration.
田间土壤的容重常在1.0到1.4克；立方厘米范围内，且具有均匀的孔隙度和渗透性。
Field soils often have bulk densities ranging from 1.0 to 1.4gcc; with commensurate porosities and infiltration characteristics.
研究表明，砂岩层内的早期成岩作用(压实、压溶、胶结和交代作用)使孔隙度和渗透性降低。
Researches show that in the early stage of sandstone diagenesis, compaction, pressure solution, cementation and replacement reduce both the porosity and the permeability.
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