Classification and correlation of Permian volcanic rocks in Mid-Tarim area

On the basis of lithological characters and electricity of volcanic rock, the volcanic rocks in Permian strata in Mid-Tarim area were divided into distinct units of lava cell and lava group. Taking lava group as an essential unit for compartmentalizing and contrasting volcanic rock stratum, the classification and correlation of volcanic rock strata show that volcanic movement in the central Tarim area became weak from north-west to south-east. There occurred six times of volcanic eruptions in the west part, four times in the middle part and none in the east part. The main types of igneous reservoirs of Permian in the central Tarim area include the overlapping and draping type and uplifting leaching type.