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微震监测定位技术的精度及效率是微震监测中的核心技术问题,震源扫描算法作为一种稳定、可靠的方法被广泛用于微震监测定位中,但是在多事件、多参数反演中,其反演效率严重制约其应用.本文将震源扫描算法与DIRECT算法思想结合,提出基于DIRECT算法的微震快速网格震源搜索定位方法,即在求解震源扫描算法目标函数最优解时,采用DIRECT搜索策略,无需划分网格大小,直接搜索目标函数最优解.通过地面及井中微震监测模型测试表明,基于DIRECT算法的微震快速网格震源搜索定位方法比传统的震源扫描算法搜索次数少、计算耗时短、计算精度高,尤其适合大空间内多事件、多参数的震源反演,为水力压裂微震监测过程中大量数据的实时、快速、准确定位提供了可能.
The accuracy and efficiency of microseismic monitoring and positioning technology are the core technical issues in microseismic monitoring. As a stable and reliable method, source scanning algorithm is widely used in microseismic monitoring and positioning, but in multi-event and multi-parameter inversion, The efficiency of a serious constraint on its application.In this paper, the source scanning algorithm and the DIRECT algorithm combined with the proposed DIRECT algorithm based microseismic fast grid source search positioning method, that is, in solving the source scanning algorithm objective function optimal solution, the use of DIRECT search strategy, Without dividing the grid size, the optimal solution of the objective function is searched directly.The tests of the microseismic monitoring model in the ground and in the well show that the microseism-based fast grid source search and location method based on the DIRECT algorithm has less search times than the traditional source scanning algorithm, , Which has high computational accuracy and is especially suitable for multi-event and multi-parameter seismic source inversion in large space. It provides the possibility of real-time, fast and accurate positioning of a large amount of data during the microseismic monitoring of hydraulic fracturing.