Research On Sedimentary Facies And Reservoir Characteristics Of The Middle And Lower Cambrian In Block 10 Of Yaha, Tarim Basin

As the theoretical basis is sedimentary petrology,petroleum geology and petrophysics,the use of drilling and logging data,and predecessors' research results,this block's main types of sedimentary facies are shallow-sea carbonate platform facies,which are divided into restricted platform and open platform based on petrology evidence,palaeontologic evidence and logging evidence.Through utilizing core observation and thin section identifying,the block have three types of dolomite,which are residual grain dolomite,crystal dolomite and transitional dolomite.Concluded several reservior space of Middle-Lower Cambrian in Yaha 10 block,which are eroded pores,eroded holes,intergranular eroded pores and intergranular pores,fissures.The block's reservior is divided into the type of eroded pores and holes,fissures,and combination.The author analyze the combined reservoir space features of wells in Yaha 10 block in details and evaluate integrated reservoir of four wells in this area.As the research of cathodoluminescence,X-ray diffraction degree of order,macroelement,strontium isotope and fluid inclusion microthermometry is done,and concluding previous comprehensive study of sedimentary facies and reservior characteristics,discuss the causes of dolomite of Middle-Lower Cambrian in Yaha 10 block.In this paper the dolomitization is divided into Penecontemporaneous dolomitization and burial dolomitization.The dolomite of this block was deposited in penecontemporaneous and remoulded by the buried recrystallization and hydrothermal activity.Yaha 10 block's reservior was controlled by sedimentary,diagenesis and tectonism.Sedimentary facies provide material foundation for reservior.Diagenesis,especially dolomitization and erosion,moulde reservior.The main Yaha fault and other faults and fissures in this block provide reservior space and channel for hydrothermal fluid.Diagenetic sequence in this block occur agglutination,dolomitization,pressolution and recrystallization from penecontemporaneous to early diagenetic stage and late diagenetic stage.The evolution of the porosity is undergoing as the diagenesis developed.