The seismic reflection characteristics and response relationship of volcanic rocks lithofacies in Changling fault depression,Songliao basin

The volcanic reservoir is predominantly controlled by lithology and lithofacies,in order to improve the seismic identification precision of lithology and lithofacies,well-neighboring seismic facies of typical drilling volcanic rocks from the Yingcheng Formation and Huoshiling Formation in the Changling fault depression,the South of the Songliao basin are analysed..Relevant recognition models for acidic and intermediate-basic volcanics facies are set up.among which there is the most significantly difference :the former is explosive facies and the latter is effusive facies.The former is characterized by sheet drape,slaty,parallel-subparallel reflection structure,good continuity,strong amplitude and low frequency,whose distribution range is bigger than the latter.The latter is characterized by slatywedge-shaped,parallel-subparallel reflection structure,partial vermicular reflection structure,middle continuity,middle-strong amplitude and middle frequency,whose distribution is bigger than the former.Based on their distinct features of the electric logging responses,internal seismic reflection structures and geometric shape of the volcanic rocks,the corresponding relation of the different connection between seismic facies and logging facies is summed up,which provides a basis for identifing volcanic facies,predicting volcanic reservoirs and dividing favorable reservoir facies belts for a new area.