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    • 1. 发明申请
    • ITERATIVE MIGRATION VELOCITY OPTIMIZATION FOR A VSP SURVEY USING SEMBLANCE
    • 用SEM研究VSP测量的迭代偏移速度优化
    • WO2018063156A1
    • 2018-04-05
    • PCT/US2016/053953
    • 2016-09-27
    • HALLIBURTON ENERGY SERVICES, INC.
    • PADHL, AmitWILLIS, Mark, Elliott
    • E21B47/00G01V1/40G01V1/48
    • G01V1/42G01V1/303G01V1/40G01V1/48G01V2210/1295G01V2210/1429G01V2210/161G01V2210/48G01V2210/512G01V2210/52G01V2210/6222
    • A method to process vertical seismic profile (VSP) data includes receiving VSP data, migrating the VSP data output using an initial velocity model to produce migrated depth values associated with the respective receivers, sorting and collecting the migrated depth values corresponding to each receiver to produce a migrated common receiver gather (CRG) associated with each receiver, stacking the migrated depth values of the CRGs corresponding to respective fixed lateral positions in an image volume to produce a common image gather (CIG) associated with each lateral position, and generating a semblance panel having the stacked depth migration values plotted as contours on a first axis for velocity ratio (vr), which is based on migration velocity and true velocity) and a second axis for true depth (Zt). The method further includes updating the initial velocity model based on a plurality of data points selected from the semblance panel to provide an updated velocity model.
    • 处理垂直地震剖面(VSP)数据的方法包括接收VSP数据,使用初始速度模型迁移VSP数据输出以产生与各个接收器相关联的迁移的深度值,分类和收集迁移的 对应于每个接收器的深度值以产生与每个接收器相关联的迁移的公共接收器集合(CRG),将与各个固定横向位置对应的CRG的迁移深度值堆叠在图像体积中以产生与以下关联的公共图像集合(CIG) 每个侧向位置,并且生成具有堆积的深度偏移值作为第一轴上的轮廓的速度比(vr)(其基于偏移速度和真实速度)和第二轴的真实深度(Zt)绘制的相似面板。 该方法还包括基于从相似面板中选择的多个数据点来更新初始速度模型,以提供更新的速度模型。