IDENTIFICATION FOR DEEP VOLCANIC RESERVOIR IN XINGCHENG-FENGLE AREAS,SONGLIAO BASIN

The prophase drilling results have revealed that deep volcanic formations with great thickness are widely distributed in the northern Songliao Basin,suggesting there are significantly favorable gas reservoirs with good exploration prospects.However,how to find volcanic reservoirs is an important issue in deep gas exploration in the northern Songliao Basin.Therefore this study combined drilling data and seismic data to identify volcanic reservoirs acquiring some good results and providing important technical supports for gas volcanic reservoir exploration.Starting from the core analysis of volcanic reservoirs,the study built up a geologic-seismic model of volcanic reservoir while applying seismic response properties analysis,structural tread panel analysis,seismic attribute analysis,3D volume slice analysis,seismic inversion techniques and so on to identify volcanic reservoir.This model has been used in deep gas exploration with good effects in the northern Songliao Basin,and demonstrating that breakthrough has made in seismic prediction technique of volcanic reservoir.The subsequent drilling results verified the seismic recognition model for deep volcanic reservoir has good practical application effects.This paper suggests this model should be encouraged in deep volcanic gas reservoir exploration in the Songliao Basin.