大丰兴化地区火山岩地震识别方法研究

Seismic identification of volcanic in Dafengxinghua area.

(1.中国石油天然气股份有限公司杭州地质研究院,浙江杭州310023;2.中国石油天然气股份有限公司浙江油田分公司,浙江杭州310013)

Zuo Guoping,Hangzhou Research Institute of Geology,Petrochina,Hangzhou 310023,China

火山岩具有形态不规则、横向结构变化快的特点,这给火山岩识别带来了较大困难。为了更准确、快速地识别火山岩,以大丰兴化地区为例,进行了火山岩地震识别方法研究。大丰兴化地区主要发育3类火山岩岩相——火山口、火山通道和火山侵入岩,不同岩相的火山岩具有不同的地震反射特征和属性特征。运用地震剖面识别法、振幅和相干时间切片、地震属性分析和波阻抗反演等方法对该区3类火山岩岩相进行了识别，识别结果与钻井资料吻合较好，说明了识别方法的有效性。

Volcanic is characterized by irregular shape and fast change of lateral structure,which leads to the difficulty for volcanic identification.In order to more accurately and rapidly identify volcanic,we takes the Dafengxinghua area as example to study the seismic identification methods of volcanic.Three types of volcanic litho facies develop in Dafengxinghua area,including volcanic crater,volcanic conduit and volcanic intrusion rock.Different litho facies has different seismic reflection and attribute characteristics.Seismic section recognition method,amplitude and coherent time slices,seismic attribute analysis and impedance inversion were used to identify the three types of volcanic facies.The identification result matches well with drilling data,which indicates the flexibility of the method.