To explore the intricate relationship between volcanic rock types,volcanic facies,and genetic models within the Yingcheng Formation of the Songliao Basin,and to understand their implications for oil and gas exploration,a comprehensive analysis was conducted using a wide array of geological data.This included field outcrops,drilling data,and rock slices,allowing for the identification of volcanic rock types,classification of volcanic facies,and analysis of the genesis characteristics of these facies.It is concluded that:①Four types of volcanic rocks are developed in Yingcheng Formation,which are lava,pyroclastic lava,pyroclastic rock,and clastic sedimentary rock;②The outcrops of Yingcheng Formation are divided into five lithofacies types,which are crater facies-volcano channel type,crater-post volcanic type,near crater-volcano slope type,volcanic slope type and volcanic dome type;③ Two genetic modes of volcanic facies,crater accumulation genetic mode and volcanic slope genetic mode,are established.
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