微地震地面监测层状起伏速度模型校正算法

发布时间：2018-11-22 08:37

【摘要】：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。
[Abstract]:Establishing an available velocity model within the monitoring area can effectively improve the reliability of microseismic location. In this paper, the correction of microseismic ground monitoring velocity model is studied. At present, the existing methods of velocity model correction for ground monitoring of micro-earthquakes only analyze the uncertainty of velocity in each layer, and do not take into account the uncertainty of the interface position of each layer, which leads to a certain error in the final result of perforation location. In this paper, based on the method of constructing amplitude superimposed microseismic velocity model, the method of enlarging solution space to improve the accuracy of perforating relocating is put forward. In the process of very fast simulated annealing, both the velocity uncertainty of each layer and the uncertainty of interface location are considered. The experimental results of two-dimensional stratiform undulate strata show that compared with the existing methods, this method can accurately locate perforation events to its true value, and can effectively improve the reliability of micro-seismic event location near perforation points. Finally, the method is applied to practical field data processing to verify the effectiveness and practicability of the method.
【作者单位】：吉林大学仪器科学与电气工程学院;中国石油集团渤海钻探工程公司;
【基金】：国家自然科学基金项目(41074074) 吉林省科技发展计划项目(20160204065GX) 吉林省省校共建计划专项项目(SXGJSF2017-5)
【分类号】：P631.4

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