关键词: 准噶尔盆地, 第三系, 储集层特征, 胶结作用, 分析, 评价

Abstract: Tertiary reservoir rocks in western part of south margin of the Junggar basin are mainlysandstones and sandy conglomerates.The reservoir in Shawan formation rocks are braidedchannel sandbodies with median porosity and low permeability.Those in the Taxihe forma-tion are coastal bars which are characterized by high porosity and high permeability-lowporosity.However,the Shawan and and Taxihe formations are the favorable reservoirs in theDushanzi oil field.The main factor affecting the reservoirs is the content of cement.The existence of largeamount of montmorillonite and illiteresulting in particle migration and blocking of the porespace.Meanwhile,later calcite cernentation make reservoir rocks more compact,reducingporosity and permeability.Petrophysical properties is depend on the amount of calcite,andthe degree of the damaged reservoir depends on the content of montmorillonite.

Key words: Junggar basin, Tertiary, reservotr characteristics, cementation, nalysis, evaluation