黏性介质叠前时间偏移方法  

The method of prestack time migration in anelastic media

作　　者：李雪英[1,2,3] 文慧俭[1] 张桐[4] 于国楠 王金丽 

机构地区：[1]东北石油大学地球科学学院,黑龙江大庆163318 [2]大庆油田博士后科研工作站,黑龙江大庆163458 [3]东北石油大学博士后科研流动站,黑龙江大庆163318 [4]大庆油田有限责任公司第三采油厂,黑龙江大庆163113 [5]大庆油田有限责任公司第二采油厂,黑龙江大庆163416

出　　处：《东北石油大学学报》2013年第4期98-104,124,共8页Journal of Northeast Petroleum University

基　　金：国家科技重大专项(2011ZX05008-006-42);黑龙江省博士后基金项目(LBH-Z12002);黑龙江省教育厅科技项目(12513069)

摘　　要：根据衡Q模型,将吸收系数引入黏性介质的相速度中,以相移法为基础,利用稳相点原理,推导基于叠加速度和等效Q值的黏性介质叠前时间偏移的走时和振幅计算公式,研究适合于黏性介质的叠前时间偏移方法.理论数据处理结果表明,该方法具有精确的复杂构造成像能力,能够将黏性补偿结合到偏移过程中,有效恢复深层界面的高频信息;在准确构造成像的同时,提高地震成像的分辨率.A wave equation based prestack time migration scheme in anelastic media is proposed.Frequency independent Q law and complex phase velocity are used to describe the absorption of seismic energy.Methods for wavefield extrapolation and prestack time migration in complex anelastic media are developed based on phase shift method and stationary point theorem.The synthetic dataset are used to demonstrate that the prestack time migration in dissipation media not only can improve the ability of imaging complicated structure when the velocities mildly vary.The migration section of a 2D dataset proved that incorporation compensation for absorption and dispersion into time migration can effective resume the high frequency information of deep reflection.The spatial wavelet was compressed;the band of frequency was extended;the amplitude of record was increased;the revolution of seismic profile was enhanced.

关 键 词：叠前时间偏移 黏性吸收补偿 等效Q值 稳定性控制 黏性介质 

分 类 号：TE55[石油与天然气工程—油气田开发工程]