成岩作用对储层孔隙的影响--以辽河盆地荣37块气田下第三系为例

通过对岩芯、铸体薄片、阴极发光薄片观察及X－衍射分析，认为辽河盆地下第三系砂岩储层成岩作用中的压实作用和胶结作用减小和破坏储层孔隙，溶蚀作用则增加储层孔隙，且后者仅在一定深度范围内作用，并从沉积相、砂岩的成因及岩屑成份等方面探讨了成岩作用对储层孔隙度的影响。

Diagenesis Effect on Reservoir Pores-Taking the Rong-37 Block of the Lower Tertiary,Liaohe Basin as an Example

This paper reviewed some of the important results of the core rock section, cathodo luminescence and X-ray diffraction. The diagenesis in the Rong-37 block of the Lower Tertiary reservoir of are com-paction, cementation, dissolution and replacement. The reservoir pores are destroied by compaction and cementation, and increased by dissolution but they affect reservoir pores in different depth. Secondary pore formation are connected with the sedimentary facies, sandstone origination and lithoclast, etc. The reservoir of Low-Tertiary sandstone′s primary pores decreased by compaction and cementation at eogeneticst age, The depth is from 1000 m to 1600 m, and the primary pore will be lost 5% to 10% . The sandstone porosity were increased by dissolution at late eogeneticst age to early epigeneticst age in depth of 1600 m to 2600 m, but the sandstone porosity are nearly zero at late epigenesis by authigenic mineral. Point bar with the high primary pores compositional and textural maturity would keep a lot of pores after diagenesis. But lands and palus sandstone with the low compositional and textural maturity would loss the chief primary pore by diagensis. Secondary pores is important in the reservoir.