Keywords: 
• sandstone /
• diagenesis /
• pore /
• Lower Tertiary

Abstract: 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.