The diagenetic process, porosity evolution , factors of controlling reservoir quality, the time and duration of entering and undergoing each diagenetic stage, of Donghe sandstones in central Tarim basin are studied. The relative primary and secondary porosity volume is gotten from microscopic measurement. According to the regional structural evolution, the factors controlling solution are discussed. Combined with the hydrocarbon filling and escaping history, the factors of secondary porosity surviving and disappearing are analyzed. The results indicate that Donghe sandstones in central Tarim basin went through the compaction, clay cementation, quartz overgrowth, carbonate cementation, solution and authentic kaolinite precipitation during the diagenesis, and now it is in the late diagenesis. There are some differences in diagenesis between east and west area. In the west area, the Donghe sandstones entered the early diagenesis B and late diagenesis A earlier than in east, and is with a clear lower solution-upper cementation sequence section. The eureservoir mainly distributed in the places which is of pure lithological components, low clay, continuing uplift, early hydrocarbon filling, and no carbonate cementation. That is the foreshore—shoreface area which has been being uplift since Permian.
. Diagenesis Process, Porosity Evolution and Factors of Controlling Reservoir Quality of Devonian Donghe Sandstones in central Tarim Basin[J]. JOPC, 2003, 5(3): 378-390.
