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.
早期成岩作用主要影响原生孔隙的发育，晚期成岩作用影响次生孔隙的发育。
The early diagenesis mainly influences the development of primary pore and the late diagenesis mainly influences the development of secondary pores.
方法为：（1 ）成岩作用早期：应用孔隙度测井和岩性测井资料，通过压实曲线分析压实作用区间；
The method include as fellows:(1) In Early diagenesis stage, the porosity and lithology well logging data are applied to analysis compression curve, and to determine the compression area.
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