松辽盆地营城组火山机构-岩相带的地震响应

松辽盆地徐家围子断陷多期次喷发的火山岩在纵向和横向上相互叠置,造成火山岩地震响应特征复杂,影响了对火山岩储层的地震预测精度和地质规律的认识.本文基于钻井和连片三维地震资料,结合区域构造认识,建立了徐家围子断陷营城组火山机构-岩相带的地震响应模式,并利用相干体和地层切片等属性分析技术实现了火山机构-岩相带的空间识别.从火...

The seismic response of the volcanic edifice-facies zone of Yingcheng formation in the Songliao Basin

The complex seismic response features of volcanic formation, that was caused by multi-stage volcanic eruption and superimposed in the vertical and horizontal directions, affect the reservoir accuracy of seismic prediction and the cognition of geological laws in Xujiaweizi depression. Based on drilling and 3D seismic data, combined with the regional tectonics, this article establishes the seismic response model and identifies the spatial distribution of the volcanic edifice-facies zone by the technology of coherence and formation slice attribution. From the vents to the distal facies the volcanic body heterogeneity weakens, the rate of change reduces gradually in the coherence cube slices. There are four types of volcanic facies seismic response in the research area. The first type is multi-facies supoimposed zone of dome crater which shows the characteristics of messy reflective band and bottom-up radial shape. It also has the features of thinning out around the volcanic vents, strong coherence, varied forms in profile and plan view. The second type is near-source superimposed eruption and overflow facies that has the reflection characteristics of intermittent layering, moderate-high amplitude, and low frequency. It is distributed in bands around the crater. The third type is distal eruption facies that has the reflection characteristics of continuously layered wedge and strong amplitude. It has the arch plate shape adjacent to the side of the volcanic body. The fourth type is distal volcanic sedimentary facies that has the reflection characteristics of plate shape, sub-parallel reflection configuration,strong energy,continuous phase axis.