Volcanic Seismic Facies and Exploration Potential in Tahe Area, Tarim Basin

Based on the interpretation of seismic data and logging,combined with core observation in Tahe area in Tarim basin,the types of volcanic rocks,seismic facies feature and volcanic reservoir-forming conditions are clarified and analyzed.Two types of volcanic rocks such as dacite and basalt of Permian and four seismic facies such as stratified,mound-shaped,lenticular and wedge-shaped ones occur in this area.The stratified seismic facies is in wide distribution,corresponding to the run-off volcanic rock; the lenticular seismic facies is only found in salt-edge sag,mainly controlled by the salt body activity; the mound-shaped seismic facies corresponds to intrusive volcanic rock; the wedge-shaped seismic facies is controlled by the basement fissure,laterally contacted with surrounding rocks,corresponding to near-crater facies; the mound- and wedge-shaped seismic facies are of effective traps and better reservoir conditions,being favorable areas for oil and gas exploration.