Abstract: According to the structural environment and cycle characteristic of the volcanic eruption，original magma，volcanic
rock feature，and the types of the volcanic eruption，the mode characteristics of volcanic eruption of volcanic gas reservoir of the
Member 1 of Yingcheng Formation in Xudong Area in Xushen Gas Field are studied. The results indicate that the aimed stratum
in study areas was formed under an intraplate setting and the fractures cut-through the base plays a definitive role. The study
stratum fall into three gyrations of I and II and III from bottom to top. Gyre I correspond to YC1III and Gyre II corresponds
YC1II1 and YC1II2 and Gyre III corresponds YC1I1 and YC1I2. The stratum in study areas mainly developed fissure-center
eruption，the center eruption taking the secondary place. The conditions of oil source rock and accumulation and rock cap
are excellent. The volcanic eruption mode controlls development characteristics of different types of volcanic lithofacies. The
favorable areas mainly develop in the high-order bit of eruption facies near the volcanic crater and lower part and upper part
and top part sub-facies of overflow facies and volcanic neck sub-facies of volcanic channels facies.

Key words: Xudong Area, the Member 1 of Yingcheng Formation, volcanic reservoir, volcanic lithofacies, mode of volcaniceruption