The existing method of velocity optimization for surface monitoring only considers the velocity uncertainty of each layer , which bring certain errors in the results of perforation shot relocation .A new method of expanding the solution space on the basis of amplitude stacking is proposed to improve the accuracy of perforation shot localization . In the process of every fast simulated annealing , the velocity uncertainty and location uncertainty of each layer are considered simultaneously .Synthetic data test shows that ,compared with the existing method ,the proposed method can accurately locate the perforating shot to its actual value ,and can effectively improve the location reliability of microseismic events near the perforation .This new method is applied to actual field data processing ,and its validity and practicability are verified .%在监测工区范围内建立一个可用速度模型能够有效地提高微地震定位的可信度,本文针对微地震地面监测速度模型校正进行研究.目前已有的微地震地面监测速度模型校正方法仅对各层速度不确定性进行了分析,并没有考虑到各层界面位置不确定性,导致最终射孔定位结果仍存在一定误差.本文在振幅叠加微地震速度模型构建方法基础上,提出了通过扩大解空间的方法提高射孔重定位精度,即在极快速模拟退火方法过程中同时考虑各层速度不确定性和层界面位置不确定性.二维层状起伏地层模型实验表明:与现有方法相比,该方法能够准确将射孔事件重定位至其真实值处,并能有效提高射孔点附近微地震事件定位可信度.最后将该方法应用于实际野外数据处理,验证了该方法的有效性和实用性.
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