微地震地面监测层状起伏速度模型校正算法  

Stratum undulation velocity model optimization algorithm for microseismic monitoring on surface

作　　者：江海宇 刘玉海 孙海林 徐克彬 白田增 陈祖斌[1] 

机构地区：[1]吉林大学仪器科学与电气工程学院,长春130026 [2]中国石油集团渤海钻探工程公司,天津300457

出　　处：《吉林大学学报（工学版）》2017年第6期1969-1975,共7页Journal of Jilin University:Engineering and Technology Edition

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)

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。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 last 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 mieroseismic events near the perforation. This new method is applied to actual field data processing, and its validity and practicability are verified.

关 键 词：固体地球物理学 微地震地面监测速度模型校正 速度不确定性 层界面位置不确定性 射孔重定位 

分 类 号：P631[天文地球—地质矿产勘探]