井巷约束实时动态速度建模

Real-time Dynamic Velocity Modeling of Tunnel Restraint

为了提高煤矿勘探精度,把叠前深度偏移技术应用到煤炭勘探中很有必要,而叠前道集的品质和速度建模的精度是决定叠前深度偏移剖面质量最重要的两个因素。因此,为了得到高质量的叠前道集,要做好精细静校正、多域绿色噪音压制、振幅补偿、反褶积、速度分析、数据规则化等多个处理环节。而速度模型的建立包括:建立初始速度模型、沿层层析成像、网格层析成像。在此基础上,利用井巷约束下的速度分析进一步更新速度模型,得到了更加精准的深度域速度体,并随着实时回采到的新的巷道数据,动态地优化更新速度场,实时提高深度偏移成果质量。结果表明,利用这种井巷约束下的实时动态速度建模方法,进行叠前深度偏移得到的深度剖面能极大地提高断层落差和平面位置的精度。

In order to improve the exploration precision of coal mine,it is necessary to apply prestack depth migration technology to coal exploration.Since the quality of prestack gathers and the precision of velocity modeling are the two most important factors to determine the quality of prestack depth migration profiles,we need to do a good job in fine static correction,multi-domain green noise suppression,amplitude compensation,deconvolution,speed analysis,data regularization and other processing links to get high quality prestack gathers.The precision of velocity model plays a decisive role in the quality of prestack depth migration profile,so velocity modeling is the core of prestack depth migration technique.The establishment of velocity model includes establishing initial velocity model,tomography along the layer,grid tomography.Based on that,we further update the velocity model to obtain a more accurate velocity body in depth domain by using the velocity analysis under the constraints of the tunnel.Moreover,the velocity field is updated dynamically with the new data of real-time mining,and the quality of depth migration is improved in real time.By using this method of real-time dynamic velocity modeling,the depth section obtained by prestack depth migration can greatly improve the accuracy of fault throw and plane position.