角度道集匹配相关速度分析方法  

Matching correlation-function velocity analysis based on ADCIG

作　　者：李江 李庆春[2] 唐文 LI Jiang;LI Qingchun;TANG Wen(Xi'an Research Institute,China Coal Technical&Engineering Group Corp,Xi'an,Shaanxi 710077,China;School of Geological Engineering and Geoma-tics,Chang'an University,Xi'an,Shaanxi 710154,China;School of Earth Sciences and Engineering,Xi'an Shiyou University,Xi'an,Shaanxi 710065,China)

机构地区：[1]中煤科工集团西安研究院有限公司,陕西西安710077 [2]长安大学地质工程与测绘学院,陕西西安710154 [3]西安石油大学地球科学与工程学院,陕西西安710065

出　　处：《石油地球物理勘探》2019年第5期962-969,I0007,共9页Oil Geophysical Prospecting

基　　金：国家自然科学基金项目“海底节点地震波场模拟与转换波成像方法研究”(41874123);中央高校基本科研业务费专项基金“复杂山区公路地质灾害地球物理精细探测技术”(300102268401);陕西省教育厅科研计划项目“古岩溶风化壳储层模型及三维正演模型研究”(18JS091)联合资助

摘　　要：波动方程偏移输出的角度道集避免了波场传播路径的多解性,且对偏移速度场误差敏感,非常适用于偏移速度分析。基于角度道集的运动学属性,推导了适用于倾斜地层的剩余深度方程,以满足复杂构造的速度分析。在剩余曲率法偏移速度分析中,为了获得定量的剩余曲率值以准确判断速度误差,引入匹配相关剩余曲率谱计算方法,与叠加法和相关法相比,提高了剩余曲率计算对原始数据的抗噪能力,且具有更高的分辨率、能拾取更为准确的剩余曲率值,提高了速度分析的精度。模型数据和实际资料测试验证了方法的有效性。Avoiding the multi-solution problem of wavefield propagation and being sensitive to errors of migration velocity,angle-domain common image gathers(ADCIG)are very suitable for migration velocity analysis.Residual depth equations suitable for inclined strata are derived based on kinematics properties of ADCIGs to satisfy the velocity analysis of complex structures.A matching correlation-function residual curvature spectrum algorithm is developed to obtain accurate residual curvature va-lues.Compared with stack and correlation methods,the proposed algorithm has better noise-resistance and a higher resolution,achieves more accurate velocity analysis.Model and real data tests prove the validity of the proposed algorithm.

关 键 词：角度域共成像点道集 速度分析 剩余曲率 相关函数 

分 类 号：P631[天文地球—地质矿产勘探]