叠前分角度道集的瞬时谱差异信息提取及应用  

Instantaneous spectral difference anomaly extraction on prestack multi-angle gathers and its application

作　　者：陈学华[1,2] 贺振华[1,2] 赵岩[2] 钟文丽[3] 

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室,四川成都610059 [2]成都理工大学地球物理学院,四川成都610059 [3]成都理工大学地球科学学院,四川成都610059

出　　处：《石油地球物理勘探》2012年第1期89-94,188+195-196,共6页Oil Geophysical Prospecting

基　　金：国家自然科学基金项目(41004054);高等学校博士学科点专项科研基金项目(20105122120002);四川省教育厅自然科学重点项目(092A011)资助

摘　　要：基于不同角度叠加道集中含流体层地震反射波的振幅(或能量)及其低频信息变化更明显的特性,本文提出了一种利用叠前不同角度叠加道集的低频地震信息进行流体识别的方法,即分别对小(近)角度和大(远)角度叠加的地震道集进行瞬时谱分解,再利用低频分量构建瞬时谱差异信息提取的计算公式,进而得到流体识别剖面。文中应用该方法分别处理了陆上和海上资料,检测的油气异常与实际钻井结果相符。Since seismic reflection amplitude(or energy) and its low frequency components of the fluid-filled reservoirs on different angle stack gathers vary significantly,this paper presents a new fluid identification method using seismic low frequency components on prestack different angle stack gathers.The method first carries out instantaneous spectral decomposition of both near-angle and far-angle stack gathers,and then introduces an instantaneous spectral difference extraction formula by the low frequency spectral components.Finally a fluid identification section is obtained.Applications of the method on both offshore and onshore seismic data are given respectively in the paper.The results show that the detected hydrocarbon anomaly is consistent with the actual drilling.

关 键 词：多角度叠加道集 瞬时谱分解 低频差异信息 AVO 油气检测 

分 类 号：P631[天文地球—地质矿产勘探]