摘要
在塔里木盆地碳酸盐岩地区,洞缝型储集层往往埋藏在5000m以下的区域,再加上沙漠地区地表十分疏松,对地震波的能量吸收十分严重,使得在这些地区采集得到的地震信号往往具有能量弱,频率低,子波形状严重畸变等特点,因此在对这些地区地震资料成像时,必须考虑由这些非弹性因素造成的振幅衰减、频率下降和相位畸变。为此本文研究了一种基于Kirchhoff法的Q偏移方法。首先介绍了该方法的基本原理,然后通过数值模型试算,验证了此方法的正确性和可行性,最后将方法应用于塔里木盆地轮古38井的实际VSP资料中,通过与利用传统方法所成像结果的对比,验证了该方法的优越性。
The fractured and caved carbonate reservoirs in Tarim Basin are buried bellow depth of 5000m.Because the surface of desert is very loose,the energy of seismic wave surfers serious absorption.Hence the characteristics of seismic signal recorded in these areas always show weak energy,low frequency and phase distortion.It is very important to consider these effects when imaging.To solve the problem above,a Kirchhoff Q-migration method is developed and presented in this paper.Firstly,the theory of Q-migration is introduced.Then a numerical model is tested to prove the applicability of this method.Finally,both Q-migration and traditional Kirchhoff migration are implemented to a VSP field data of Well LG38 in Tarim Basin.The results show that our Kirchhoff Q-migration method is better in imaging than the traditional one.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2011年第A01期7-11,163+166,共5页
Oil Geophysical Prospecting
基金
国家重点基础研究发展规划973项目(2011CB201103)"中国西部叠合盆地深部有效碳酸盐岩储层形成机制与分布预测"
国家油气重大专项(2011ZX05004003)"海相碳酸盐岩储层地震描述与油气藏有效预测技术研究"资助
关键词
真振幅偏移
黏弹性介质
Q吸收补偿
amplitude-preserved migration,viscoelastic media,Q compensation
