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为了深入了解徐家围子断陷深层不整合结构及其与天然气运移的关系,利用地震、钻井资料对徐家围子断陷深层不整合结构和岩石物性进行了统计分析;结合已有勘探成果划分了不整合运移通道类型,对与不整合相关的天然气运移方式进行了总结。结果表明:火山岩是徐家围子断陷深层不整合的重要组成部分,火山岩半风化岩石的孔渗性远优于顶板岩石;徐家围子断陷深层不整合运移通道可以划分为2大类9亚类,火山岩作为半风化岩石时可以形成多种类型运移通道。与不整合相关的天然气运移模式可归纳为不整合直接运移、不整合与连通砂体组合运移、不整合与断裂组合运移及不整合与断裂、连通砂体组合运移4种类型,不整合与断裂组合运移是沙河子组排出烃类运移至营城组火山岩圈闭的主要输导方式。
In order to deeply understand the relationship between the deep unconformity structure and the migration of natural gas in the Xujiaweizi Fault Depression and to make a statistical analysis of the deep unconformity structure and petrophysical properties in the Xujiaweizi Fault Depression by using the seismic data and drilling data, The types of unconformity migration channels are summarized, and the migration modes of natural gas related to unconformity are summarized. The results show that volcanic rocks are an important component of deep unconformity in Xujiaweizi faulted depression. The porosity and permeability of semi-weathered volcanic rocks are much better than that of roof rocks. The deep unconformity migration channels in Xujiaweizi fault can be divided into two groups Sub-class, volcanic rock as a semi-weathered rock can form a variety of types of migration channels. The natural gas migration patterns associated with unconformity can be summarized as unconformity direct migration, unconformity and connected sandbody combination migration, unconformity and fault combination migration and unconformity and fault fracture, and connected sand body combination and migration 4 types The combination of unconformity and fault assemblage movement is the main transport mode for the discharge of hydrocarbons from Shahezi Formation to the volcanic trap of Yingcheng Formation.