基于τ-p域动态聚焦控制束偏移方法  

Dynamic focused of controlled beam migration inτ-p domain

作　　者：吴建文 于宗泽[1] 肖波[1] 陈洁鉴 WU JianWen;YU ZongZe;XIAO Bo;CHEN JieJian(Guangzhou Marine Geological Survey,Guangzhou 510075,China)

机构地区：[1]广州海洋地质调查局,广州510075

出　　处：《地球物理学进展》2022年第4期1631-1639,共9页Progress in Geophysics

基　　金：广州海洋地质调查局“钻探保压取心与船载检测系统集成、海试与应用”(2017YFC0307506)资助。

摘　　要：地震资料数据处理中,高斯束偏移方法不仅拥有射线类方法高效性,还具有波动方程类方法的高质量成像精度.但高斯束偏移受其初始波束参数影响较大,选定的初始宽度大小,直接影响近地表区域成像精度好坏,而将动态聚焦射线束引入到高斯束偏移中,在射线追踪过程中采用变化而非固定的初始宽度参数,合理控制射线束的传播范围,解决了高斯束束宽随传播距离增加发散过快的问题,且针对低信噪比的地震数据的问题,无法得到高信噪比的成像精度.本文从高斯束理论出发,采用τ-p域阈值控制和动态聚焦初始波束方法策略,发展了一种基于τ-p域动态聚焦控制束偏移方法.有效压制了噪声数据干扰,削弱了初始波束对射线传播范围影响,充分的改善了复杂构造区域的成像质量,并通过了水平层状模型和Marmousi模型,以及胜利油田东部某探区的实际资料进行了测试来验证了我们方法的正确性和有效性.The processing of the seismic data,the Gaussian beam migration method not only has the efficiency of ray-type methods,but also has the high-quality imaging accuracy of the wave equation methods.However,the Gaussian beam migration is greatly affected by its initial beam parameters,and its initial width directly affects the imaging accuracy of the near-surface area.The dynamic focused ray beam is introduced into the Gaussian beam migration,during the propagation range of the ray beam,initial width parameter is the variable rather than fixed.Reasonably control the propagation range of the ray beam,solve the problem of excessive divergence with the distance increase of Gaussian beam width of the beam propagation,and for the problems of random noise and seismic data with low signal-to-noise ratio,high signal-to-noise ratio cannot be obtained.Based on the Gaussian beam theory,this paper adopts the controlled strategy ofτ-p domain threshold and dynamic focus initial beam method to develop a dynamic focus controlled beam migration method inτ-p domain.Effectively suppress the influence of underground noise and weaken the influence of the initial beam on the ray propagation range,which can fully improve the imaging quality of complex structural areas.In cite of the horizontal layered model and Marmousi model,as well as the actual data of a certain exploration area in the east of Shengli Oilfield were tested to verify the correctness and effectiveness of our method.

关 键 词：Τ-P域 低信噪比 初始波束宽度 控制束偏移 

分 类 号：P631[天文地球—地质矿产勘探]