利用双路径积分算法进行高密度偏移速度建模  

High-density migration velocity model building using double path integral

作　　者：梁瑶[1,2,3] 王真理[1,2] 陈雨红[4] 李学良[1,2] 段秋梁 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]中国科学院油气资源研究重点实验室,北京100029 [3]中国科学院大学,北京100049 [4]中国科学院地质与地球物理研究所兰州油气资源研究中心,甘肃兰州730000 [5]禾一爱普能源技术(北京)有限公司,北京100029

出　　处：《石油地球物理勘探》2016年第1期141-147,164,共8页Oil Geophysical Prospecting

基　　金：国家科技重大专项专题项目"碳酸盐岩储层内幕绕射波成像与成像特征分析"(2011ZX05008-006-02-01)资助

摘　　要：针对基于双路径积分的高密度偏移速度分析算法求出的偏移速度值偏高及有效速度选取方法不够完善的问题,通过详细分析加权参数对速度建模精度的影响,提出采用拉冬变换求取CRP道集的曲率作为加权参数,有效地解决了拾取速度偏高的问题;在共成像点道集中应用相干阈值约束成像结果,选取有效成像点,显著提高了有效偏移速度的精度,改进了基于双路径积分的高密度自动偏移速度建模方法。该方法的应用不仅获得了高精度的速度模型,而且大幅度降低了人力成本,实现了低信噪比地震资料的高质量偏移成像。模型试算和实际资料处理验证了该方法的有效性。Migration velocity model building,a key part of seismic migration,plays a vital role in final imaging quality.The high density velocity analysis based on double path integral is an effective automatic velocity picking technique.But migration velocity value calculated by this method is too high,and the manner of selecting reliable velocity is rarely discussed.After analyzing weighted parameter influences on velocity models,we propose to use the curvature calculated by radon transform as weighted parameters.It is an effective solution to balance velocity models.And Coherent threshold is used in CRP gathers to restrain reliable velocities. This solution significantly improves the picked velocity accuracy.These techniques improve the velocity model building based on double path integral.The improved approach can not only obtain high-precision migration velocity model,but also significantly reduce the cost.High-quality imaging results are obtained event in low S/N seismic data.Test results on model and real data show that the proposed approach is an effective way of automatic migration velocity model building.

关 键 词：速度建模 路径积分偏移 自动偏移速度分析 

分 类 号：P631[天文地球—地质矿产勘探]