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; ③Two genetic modes of volcanic facies

crater accumulation genetic mode and volcanic slope genetic mode

are established.