【摘要】 基于火山岩溢流相的高连续强振幅和火山通道相的低连续弱振幅2种截然相反的地震反射特征,提出了振幅-方差体地震属性分级-拾取-融合技术刻画火山岩时空展布的解释新方法。具体流程是通过振幅分级显示,拾取强振幅刻画溢流相的空间展布;通过方差体分级,拾取高值部分刻画火山通道相的空间展布;最后将二者融合显示。通过渤海湾盆地莱州湾凹陷垦利6-A区块实例分析,表明该方法可以直观、有效地刻画火山岩的三维时空展布特征。研究成果有助于火山岩的三维刻画,可以广泛运用于与火山岩相关的含油气盆地。更多还原

【Abstract】 Based on the contrast of seismic reflections between volcanic channel facies(high continuity and strong seismic amplitude)and overflow facies(low continuity and weak seismic amplitude),the new method of seismic amplitude and variance cube thresholding,pickup,and merge display is built to describe the spatial and temporal distribution of volcanics and eruption phases.The workflow is characterized by:(1)Describing spatial distribution of volcanic channel facies through seismic amplitude thresholding display and strong amplitude pickup;(2)Characterizing spatial distribution of volcanic overflow facies using variance cube thresholding display and high value pickup;(3)Merging display of volcanic channel and overflow facies.The applicability of this method has been validated in the Kenli6-A block of Laizhouwan Sag,Bohai Bay Basin,showing one high effective method to characterize volcanic 3-D distribution.The method built in the paper should serve as a useful reference for volcanic 3-D seismic characterization and be used extensively in the volcanic-related basin.更多还原