利用钻井取心、薄片鉴定、全岩地球化学分析、测井及地震等资料和技术,对松辽盆地徐家围子断陷兴城地区营城组一段火山岩特征及火山喷发模式进行了研究，结果表明，该区火山岩岩石类型以酸性火山岩为主,按照“组分+成因+结构”的分类原则,其可划分为流纹岩、火山角砾岩等6种主要的岩石类型。指出：火山岩在纵向上,自下而上SiO2含量增加,表现为一个“基性—中性—酸性”的喷发旋回；平面上,较早的火山岩充填于构造低部位,分布范围较小,主要分布在中部和南部，较晚的火山岩分布范围逐渐向北、向西扩大,在全区都有分布。据此建立了以XS8井区为代表的中心式和沿SX断裂为代表的裂隙—中心式2种喷发模式，认为这些模式丰富了火山岩储层地质学的内容,对研究区火山岩气藏储层预测和储层描述具有重要意义。

By the data and methods of cores, thin section, whole rock analysis, well logging, seismic and so on, this paper analyzes the volcanic characteristics and eruption models of the First Member of the Yingcheng Formation in Xingcheng area. The main type of volcanic rocks is acid igneous rock. According to the principle of “ingredients + genesis + structure”, six volcanic rocks, such as the rhyolite, volcanic breccia, are classified. In vertical direction, the percent of SiO2 increases from the bottom to the top, forming an integrated eruption cycle from the basic igneous rock to the acid igneous rock; In plan, the distribution of the volcanic rocks shows the characteristics of low area filling, the early volcanic rocks are mainly distribute in the middle and southern areas of Xingcheng, and the later distributed in the whole Xingcheng. On the basis of the characteristics of the volcanic rocks and their distribution, the model of the volcanic eruption is concluded. There are two erupting models, one is the central vent eruption, and the other is the eruption of fissure type.