The diagenesis of clastic rock reservoirs can be divided into two successions, i. e. successively buried diagenetic succession and intermittently buried diagenetic succession. In the former case sediments subside successively after deposition, the evolutions of its diagenetic events are controlled by depth, and the reservoir properties and porosity have distinct features of zonality with the change of depth. In the latter case the evolutions of the diagenetic events are mainly influenced by tectonic events, its diagenetic evolutions are complex and the reservoir properties are controlled by uncomformities.