Abstract: Clastic rock reservoirs pores evolution is affected by organic-inorganic diagenesis. At the' buried diagenesis stages，the important cause for high Porosity and permeability in deep-buried reservoirs is the secondary pores produced by the corrosion of calcite and feldspar from the process of the dehydroxylation of organic acid in thermal evolution. With the in-crease of buried depth，diagenesis stagds will experience an evolution from early to late phas-es，and organic matter from non-maturity to maturity. Meanwhile，the reservoirs pores will also undergo an evolution from decline to re-growth. In the same ,basin, if the reser- voirs in different beds possess the same buried depth，their diagenesis phases and pores evo-
lution will be the same. Otherwise，even the reservoirs in the same beds will have different diaginesis phases and pores evolution.

Key words: Clastic reservoir Diagenesis Diagenesis phase