项目名称: 基于全局非线性最优化与形态学的井间地震波场高保真分离方法研究
项目编号: No.41264002
项目类型: 地区科学基金项目
立项/批准年度: 2013
项目学科: 天文学、地球科学
项目作者: 刘保童
作者单位: 天水师范学院
项目金额: 48万元
中文摘要: 当前的井间地震波场分离工作存在的问题主要在两个方面:(1)有效信息的损失;(2)工作量大,处理效率较低。本项目拟研究一套用于井间地震波场分离的方法,实现井间地震反射波场快速有效的高保真分离,开发相应的处理软件。为减少反射波分离时的能量损失、提高分离效率,除了利用道集特征和偏振外,重点研究基于全局非线性最优化与数学形态学的方法。全局非线性最优化方案由最小平方问题和特征值问题组成,逐一提取同相轴,适用于波是非均匀传播、子波波形与振幅变化的情况。数学形态学本质上是非线性滤波器,基于数学形态学的井间地震波场分离方法中,关键是结构元素的选择和形态算法的设计。
中文关键词: 井间地震;波场分离;极化滤波;特征提取;时变偏振合成
英文摘要: In current,existing problems in wavefield seperation of cross well seismic are mainly as follows:(1)the loss of effective information; (2)great work load,low work efficiency. This project studies the method of wave field seperation for cross well seismic,which achieves high fidelity and efficient seperation of reflection waves in cross well seismic. To reduce the loss of reflection wave,and improve the efficiency of seperation,besides use of channel gather and polarization,methods based on global nonlinear optimization and mathematical morphology are to be explored as focal point of the work. Global nonlinear optimization consists of least square problem and eigen value problem. Events are extracted one by one. It allows each event to independently vary in its amplitude and arrival time. Mathematical morphology is a nonlinear filter. In wave field seperation with morphology,the key point is selection of structral element and design of morphological algorithms.
英文关键词: crosshole seismic;wave field separation;polarization filtering;feature extraction;time varying polarization synthesis