EXPLORATION ACTUALITY AND COUNTERMEASURE OF THE TRIASSIC OIL RESERVOIRS IN TAHE OILFIELD OF THE TARIM BASIN

The Triassic traps were multiplex with mainly compounded types in Tahe Oilfield of the Tarim Basin.Structural traps generally were with low amplitude and small close area.Lithologic traps were mainly controlled by sedimentary facies and sands pinchout.The sand thickness of lithologic traps was mostly less than 20 meters.The burial depth of the Triassic mostly was more than 4200 meters.Deep burial,small trap area,low amplitude,difficult recognition of thin sand layer,uneven distribution of pools were the difficult factors of the Triassic exploration.By the means of consolidating basic research,including the establishing of sequence framework,indepth research of seismic amplitude,identifying of low amplitude traps,identifying of nonstructural trap,study of sands body tracing and sedimentary subfacies,and so on,some good results have been achieved in the Triassic exploration in Tahe oilfield.