| 丁健华,宛新林,贺晓华.一种用于波速测试的正演和反演算法[J].安徽建筑大学学报,2016,24(): |
| 一种用于波速测试的正演和反演算法 |
| A forward and inversion algorithm for wave velocity test |
| 投稿时间：2015-07-15 修订日期：2016-03-14 |
| DOI： |
| 中文关键词: 最短路径射线追踪,SIRT算法,单孔法 |
| 英文关键词: shortest path ray tracing, SIRT algorithm, puckering method |
| 基金项目: |
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| 摘要点击次数: 2606 |
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| 中文摘要: |
| 波速测试的正演和反演算法是通过地表或井间观测到的地震波走时,推算地下或井间的介质速度结构和地震波的传播路径。其步骤如下：(1)数据采集。(2)将地下介质离散成一定大小的网格并初始化慢度(速度的倒数)场,采用射线追踪技术推导各网格节点的射线路径和最小旅行时。(3)建立线性方程组。(4)反演求解线性方程组,并修正初始慢度模型。(5)重复(2)~(4)步骤,不断修正慢度场,直到满足精度要求为止。本文采用最短路径射线追踪正演算法和改进后的同时迭代重建法(SIRT)反演算法在二维平面上进行求解计算,并且把得到的结果与传统单孔法比较,从而了解本文所采用的波速测试方法的可靠性、实用性及其精度情况。 |
| 英文摘要: |
| Forward and inversion algorithm of wave velocity test is observed by the earth"s surface or cross-hole seismic wave travel time, to calculate the underground or medium of cross-hole velocity structure and seismic wave propagation path.The steps are as follows：(1)Data collection.(2)The underground medium must be divided into the same size of the grid and initializes the slowness (the reciprocal of speed),Ray tracing technology is used to derive the ray path and minimum travel time of the grid nodes.(3)Establishing linear equations(4) solving linear equations by using inversion techniques, then correcting the initial model of the slowness.(5)Repeating steps (2) to (4),Continuously revising slowness, until meet the precision requirement.This article uses the shortest path ray tracing algorithm and the improved simultaneous iterative reconstruction techniques(SIRT) to find the result in 2 d plane , and taking the results to compare with the traditional single hole method.To understand the reliability ,practicality and accuracy of wave velocity test method in this article. |
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