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松辽盆地营城组火山岩广泛分布,构成数目众多、类型多样的火山机构,部分经后期构造变动埋藏于盆地深层并形成了大规模的火山岩储层。本文从多种地震技术手段中优选出常规地震剖面、构造趋势面和三维属性切片技术作为识别该区各类火山机构的方法,对徐家围子断陷营城组火山机构地震特征进行了系统分类。同时,结合徐家围子地区大量深层钻井资料分析,总结了营城组5种火山机构类型与特征,并进一步研究了本区火山机构的分布规律及控制因素,发现区域大断裂控制着火山口和火山机构中心,火山口决定火山相带的展布,岩相控制火山岩的储层特征及空间分布。
The volcanic rocks of Yingcheng Formation in the Songliao Basin are widely distributed and constitute a large number of volcanic structures of various types. Some of them are partially buried in the deep basin and form large-scale volcanic reservoirs. In this paper, the conventional seismic sections, the trend surface and the three-dimensional attribute slices are selected as the methods to identify the various volcanic structures in the area from a variety of seismic techniques. The seismic characteristics of the volcanic structures in Yingcheng Formation in the Xujiaweizi Fault System are systematically classified . At the same time, based on the analysis of a large number of deep drilling data in the Xujiaweizi area, the types and characteristics of five kinds of volcanic structures in Yingcheng Formation are summarized, and the distribution rules and controlling factors of the volcanic structures in this area are further studied. It is found that the large faults control the volcano crater and volcano Institutional centers and crater determine distribution of volcanic facies and reservoir characteristics and spatial distribution of lithofacies-controlled volcanic rocks.