松辽盆地北部安达断陷营城组火山岩岩相的地震识别

Identifying volcanic lithofacies of Yingcheng Formatiom by seismic attributes in the Anda Fault-Depression of Songliao Basin

安达断陷营城组的火山岩岩相分为火山通道相、爆发相、溢流相、次火山岩相和火山—沉积相,每种火山岩岩相的地震特征各不相同。根据各种岩相的地震反射特征,逐条测线解释出火山岩相,结合相干体技术和振幅属性预测了安达断陷内研究区的火山岩岩相分布,圈出3个爆发相发育区。据此讨论了地震识别方法在识别火山岩岩相和火山岩储层物性中的应用。

Volcanic lithofacies of Yingcheng Formation in the Anda Fault-Depression could be divid- ed into five types--volcanic vent facies, explosive facies, effusive facies, subvolcanic （invading） facies and volcano-sedimentary facies, with each facies having its own seismic attributes. Based on seismic reflection features of different facies,this papar identified volcanic lithofacies（three explosive facies）in the Anda Fault-Depression by seismic section interpretation, coherence technique and amplitude attributes, and encircled three localities of volcanic rocks with explosive facies. According to this example, the paper discussed the application of the method to identify volcanic lithofacies and reservoir＇s physical characters of the volcanic rocks.