低频信息对阻抗反演的影响分析  

Effect analysis of low frequency on acoustic impedance inversion

作　　者：许艳秋[1,2] 文晓涛[1,2] 郝亚炬 刘开元[3] 刘佳乐[1,2] 曾驿[4] 

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,成都610059 [2]成都理工大学地球物理学院,成都610059 [3]中石油川庆钻探工程有限公司地球物理勘探公司,成都61000 [4]中国海洋石油总公司深圳分公司,深圳510240

出　　处：《物探化探计算技术》2015年第1期78-82,共5页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国家自然科学基金项目(41174115);国家重大专项(2011zx05025-003)

摘　　要：在地震波阻抗成像和岩石物理解释中,低频信息是非常重要的。缺失低频会导致地震波频带变窄,时间域分辨率降低,最终会使波阻抗成像错误或造成虚假成像,这将会造成储层预测和岩石物理解释不正确。针对同一工区的两块资料ZJNew和ZJOld进行了波阻抗反演,含较多低频成分的ZJNew资料的反演结果分辨率较高。通过楔形模型反演结果的比较可知,低频缺失会导致在储层位置出现虚假薄夹层,造成储层预测解释错误。Low frequencies in seismic data are necessary for proper acoustic impedance imaging and petrophysical interpre-tation .Lack of lower frequencies will make frequency band of seismic narrow,decrease the time domain resolution,eventually lead to the wave impedance false imaging or sham imaging.That will lead to incorrect reservoir interpretation and petrophysical predictions.We have inverted acoustic impedance volume using two pieces of seismic data,the ZJNew and ZJOld ,at the same project .The ZJNew which contains lower frequencies yields a higher resolution image of inverted acoustic impedance volume . Comparing and analyzing the inversion results of wedge model ,it indicates that lack of lower frequencies lead to false high a-coustic impedance layer appearing in thick reservoir of wedge and cause the reservoir prediction interpretation incorrecttly .

关 键 词：低频信息 楔形模型 波阻抗反演 分辨率 

分 类 号：P631.4[天文地球—地质矿产勘探]