基于成像算子优化的微震逆时定位方法

Micro-seismic reverse time location based on imaging operator optimization

针对目前微震逆时定位成像存在的问题,提出一种优化后的成像算子,对模型数据进行抗噪性、误差速度以及检波器分布和数量进行测试,并提出采用峰度值作为定位成像结果的评价标准。结果表明,优化后的成像条件在定位能量聚焦程度和成像分辨率上都得到了提升,对含速度误差和含噪微震数据都有较好的成像结果,并且对检波器的分布和数量有较好的适应性,取得了较为理想的定位效果。

Aiming at current problems of micro-seismic reverse-time location imaging,an optimized imaging operator is proposed.The model data are tested for noise immunity,velocity error,and receiver distribution and number.The kurtosis value is used as the evaluation standard of location imaging results.The results show that the optimized imaging condition results in improved positioning energy focusing degree and imaging resolution and the method has good imaging results for both velocity error and noisy micro seismic data.The method also has a good adaptability to the distribution and number of receivers to achieve an ideal location effect.