Reservoir Characteristics And Main Controlling Factors Of The T₁j Reservoir In The Junggar

Fukang slope in oil and gas exploration began in the 1950s.Recent years,with the increase of exploration,P₂wtformation and T₁jformationhad good oil and gas shows.Along with the further exploration,understanding limitations of sedimentary system and reservoir characteristics in this region restricted the exploration progress.Therefore,it is necessary to carry out targeted,comprehensive research work.The research object is T₁j formation reservoir in the east slope of Fukang sag,east Junggar basin.Based on previous studies,This study will research the direction,sedimentary system and reservoir evolution,etc.of T₁j formation in the east Fukang region,with the dates of sedimentcore,logging,seismic andexperimentalmethodof SEM,X-ray diffraction,clayquantitative analysis,heavy mineral analysis and sensitivity analysis.The study shows:T₁jin the east slope source direction came from the both of south and north direction,the south Bogda mountain as the main source supply area,northeast Tianshan mountain,Klamere mountain in the as the secondary source supply area.The study area during this period mainly developed fan delta sedimentaryfacies,whichincludingsiltstone,fine sandstone,mediumsandstones,sandstonescoarse sandstone and glutenitein six lithic classes,according tothe composition is mainly developedbasicintermediatelithic sandstone,containing a small amount of feldspathic lithic sandstone,lithic overall content of75?80%.Main mineral composition is quartz,plagioclase,local area has higher levels of laumonite,calcite,filler content reservoir is mainly calcium,zeolite,clay mineral.The main diagenesis types of compaction,cementation,dissolution,replacement,etc.,the diagenetic phase is A phase;Reservoir pore mainly develop the residual intergranular pore,intragranular dissolved pore,fracture and so on,the main reservoir pore throat width of 2.5?7.5?m,reservoir is low?medium porosity and permeability in general;lithology and diagenesis are the major control factors of favorable reservoir,medium sandstone and fine sandstone have the best reservoir property,and the particle size is proportional to the permeability and have an inverse relationship with porosity,calcite cementation and compaction are the destructive diagenesis of reservoir.Late zeolite dissolution and chlorite film are theconstructive diagenesis.The study has a comprehensive,targeted research of sedimentary system and reservoir east Fukang slope T₁j formation,in order to provide theoretical support and basis for next exploration.