The influences of clastic composition, sedimentary environment and sedimentary facies,temperature -pressure fields,geological fluid and burial process,etc,on the diagenesis of clastic reservoir were discussed.

Characteristics of burial dissolution in the Ordovician limestone of Tahe Oilfield;

The comprehensive study of some samples from the Ordovician granule limestone in Tarim Basin showed that the burial dissolution could be classified as in-source dissolution and out-source dissolution based on the macro-microcosmic petrology and geochemistry features.

Carbonate rock reservoirs of Lower Ordovician in the eastern Ordos Basin have undergone all sorts of burial diagentic events of which burial dolomitization, burial dissolution, burial dedolomiti-zation, burial cementation, organic matter diagenesis and clay mineral transformation are major.

<ABSTRACT>Through the study on the burial diagenesis of Cambrian system and Ordovician system in Middlle Yangtze and in Ordos basin, the author considered that the constructive diagenesis of carbonate rock played an important role in increasing porosity and permeabili ty.