基于极快速模拟退火与网格逐次剖分的微地震定位算法

Based on Successive Very Fast Simulated Annealing and the Grid Subdivision of Micro Seismic Localization Algorithm Research

提高微地震定位的可靠性是水力压裂微地震监测中的关键环节,现有的震幅叠加网格逐次剖分定位方法在处理高频微地震信号时容易出现定位失常。针对此问题,本文在网格逐次剖分定位算法的基础上进行了改进,提出了极快速模拟退火与网格逐次剖分联合的微地震定位算法。该方案首先采用极快速模拟退火算法在三维目标区域内搜寻能量聚焦较高的圆形区域,然后再利用网格逐次剖分方法在区域内寻找能量聚焦最大值点。模拟数据实验表明,当微地震信号频率在100~200Hz时,其定位可靠性与计算效率明显优于现有的网格逐次剖分算法。

Improve the reliability of micro earthquake location is the key link in hydraulic fracturing microseismic monitoring,the existing seismic amplitude superposition grid successive processing low-frequency microseismic signal subdivision positioning method,the ground monitoring and positioning effect is better.But indealing with a high frequency micro seismic signal monitoring underground or shallow ground)is prone to locate.According to the above problem,this article in the localization algorithm based on grid of successive subdivision localization algorithm is improved on the basis of,puts forward the successive very fast simulated annealing and the grid subdivision joint micro earthquake location algorithm.This method first USES the very fast simulated annealing algorithm to search for energy in the area of the3d object is focused on the high circular region,successive subdivision method for mesh and recycling within the area looking for a maximum energy focus point.Synthetic data experim ents show that when the micro seismic signals in frequency100-200Hz,the positioning and calculation efficiency is superior to the existing grid reliability of successive subdivision algorithm.