A Study On Reservoir Characteristics Of Nanhua-Sinian System In The West Of Tarim Basin

In order to clarify the distribution characteristics of Nanhua-Sinian reservoirs in the west of the Tarim Basin,the detailed data of lithologic assemblage characteristics and distribution laws are taken based on the field survey profiles.Based on the analysis of sampling data,it is concluded that southwest Tarim Basin The upper and lower strata can be divided into two groups: the Yalaguzi Formation,the Bolong Formation,the Keli Xi Formation,the Yutang Formation,the Kulukekage Formation and the Kezisuhumu Formation.West Hill Group,East Qiaoenbulake Formation,Muyangtan Formation,Dongwu Formation,Yuermeinake Formation,Sugaitebulake Formation and Qigebulake Formation.The main sedimentary facies are coastal facies,shallow marine facies,iced water facies and carbonate platform facies.In the western part of the basin,there are three glacial-interglacial sedimentary cycle,the southwest is Dongqiaoenbulake moraine rock,The lower part of morainite rock group,Jurmain grams of moraine rock group.The northwest is the Yutang Formation,the second and the fourth member of the Bolong Formation.And roughly equal to the global glaciation.In the study area,the main diagenesis is the dissolution.Because the stratum is relatively old,the stratum has undergone compaction.According to the classification of porosity and permeability,the low porosity and low permeability.The study shows that the Sinhua-Sinian carbonate reservoirs in the west of the Tarim Basin are mainly developed in the Qigabulake Formation.The algal dolostone and the dolomite are the main reservoirs.The clastic reservoirs are mainly composed of the Nanhua-And the Sinian system under the system,the development of fine sandstone.The reservoir space mainly consists of intergranular pores,intergranular-solute pores,and structural dissolution joints.