巴西深海Walkaway VSP资料处理  

Processing of the Walkaway VSP data in the deep sea in Brazil

作　　者：王成礼[1,2] 姜瑞田 王玉静 WANG Chengli;JIANG Ruitian;WANG Yujing(Shengli Branch Co.of Petroleum Engineering Geophysical Company,SINOPEC,Dongying Shandong 257100,China;Shanghai Jindi Software Development Co.,Ltd.,Shanghai 200082,China)

机构地区：[1]中国石化地球物理公司胜利分公司,山东东营257100 [2]上海锦迪软件开发有限公司,上海200082

出　　处：《油气地球物理》2018年第2期13-21,共9页Petroleum Geophysics

摘　　要：Walkaway VSP技术是一种井中接收、在地面沿直线变偏的VSP技术。深海观测地面相对于陆地简单,但巴西深海为盐下成像,波场更为复杂。针对近、中、远井源距资料的不同特点,提出用中井源距检波器方位进行统计,从而实现三分量方位校正合成,较好地解决了定位问题,并进一步应用浮动坐标系极化滤波,波场分离效果好。以零偏VSP速度为基准,结合地面地震速度,综合出一个偏移速度场。用稀疏离散τ-p变换解决波动方程VSP共检波点道集成像的边界问题。处理效果表明,本文方法处理的剖面比国外公司处理的剖面分辨率高,与过井三维地面地震剖面对应性好,盐顶底成像更加清楚。The Walkaway VSP technique is a kind of VSP technique which is received in well and deviated along a straight line on the surface.The observation surface in the deep-sea is simpler than that on the land,but it is the subsalt imaging in the deep-sea in Brazil,and the wave field is more complex.According to the different characteristics of the well-source distance data from the near,middle and far well,the statistics are done by the azimuth of receiver on the middle well-source distance,so that the combination of the three-component azimuth correction is realized,the positioning problem is better solved,and the polarization filtering is further done by the floating coordinate system,the wave field separation effect is good.Taken the zero offset VSP velocity as the datum,a migration velocity field is composited combined with the ground velocity.The boundary problem of VSP CDG imaging of the wave equation is solved by the sparse dispersionτ-p transform.The processing results show that the section processed by this method has higher resolution than that processed by foreign companies,which corresponds well to the 3D surface seismic section of crosswell,and the imaging of the top and bottom of the salt are clearer.

关 键 词：Walkaway 深海 盐下成像 极化滤波 

分 类 号：P631.4[天文地球—地质矿产勘探]