井工煤矿全波形反演的初始模型构建探究

Study on initial model construction of full-waveform inversion in underground coal mine

为提高全波形反演在井工煤矿工作面的运算效果,探究了三维程函方程求解时间场的方法,由透射初至走时反演刻画出初始模型,通过建立含断层的复杂地质模型理论计算正反演来验证算法可靠性。依据小保当二号煤矿工作面实际数据,通过折射横纵波有效信息,初步刻画煤岩分界,改进初始模型,提升全波形反演梯度结果,研究成果可用于煤矿工作面的高精度探测,建立更优全波形反演系统。

In order to improve the operational efficiency of full-waveform inversion(FWI)in the working face of underground coal mine,a method for solving the time field of 3D functional equations was explored.The initial model was characterized by inversion from transmission initial travel time,and the reliability of the algorithm was verified by establishing a complex geological model with faults for theoretical calculation of forward and inversion modeling.Based on the actual data of Xiaobaodang No.2 Coal Mine working face,the coal rock boundary was preliminarily characterized,the initial model was improved,and the gradient results of FWI were enhanced through the effective information of refracted transverse and longitudinal waves,which indicated that the research results could be used for high-precision detection of coal mine working faces and the establishment of a more optimal FWI system.