Research On Sedimentary Facies And Reservoir Characteristics Of Lianglitage Formation Of Upper Ordovician In Tabei Area

The Tarim Basin is abundant in oil and gas resources,which has been a hot topic in the field of oil and gas exploration in recent years.With the guiding ideology of modem carbonate petrology,sedimentology,petroleum geology,oil and gas exploration theories and methods,using the regional geological data,seismic,core,drilling,logging and production performance data,combined with the sedimentary and reservoir aspects of the latest research results,the oil and gas enrichment regularity was analyzed comprehensively in Ordovician Lianglitage Formation,the North of Tarim Basin.According to the storage layer petrology characteristics,physical characteristics,reservoir space types,reservoir characteristics are summarized.Finally,combined with dynamic production data,reservoir rating criteria are summarized,and the single well reservoir comprehensive evaluation was finished,to provide theoretical guidance and basis in the further exploration and mining of Lianglitage Formation,in the North of Tarim Basin.Through this research,the main conclusions are as follows.The Ordovician Lianglitage Formation is relatively stable in the East-to-West distribution,in the North of Tarim Basin.The thickness variation is larger from north to south,and the entire presentation is thick in the middle,on both sides of the thin trend.During the period of Lianglitage Formation deposition,the main development platform edge and slope.Lianglitage Formation rock types are mainly grain limestone,grain micritic limestones,micritic limestone etc..The Lianglitage reservoir rock types is mainly sparry grain limestone,followed by micritic limestone.The physical properties of reservoir porosity is mainly distributed in 0.5%?4.5%,most logging permeability is less than ImD,the horizontal reservoir differences,and reservoir porosity and permeability has poor correlation.The oil and gas reservoir space of Ordovician Lianglitage Reservoirs are mainly concentrated in the pores and fractures,and the types of reservoirs can be divided into four categories:Cave,Hole,Crack,Crack-Hole type,then combined with the actual storage reservoir characteristics,reservoir parameters,the Ordovician Lianglitage Formation reservoir evaluation standard was established,and the storage layer is divided for three levels:?,?,?.Finally,according to the criterion of reservoir evaluation,the favorable exploration areas of Lianglitage reservoir have been made distribution prediction in the North of Tarim Basin by using seismic data,combined with sedimentary facies and logging data.