摘要：从弹性波动方程出发,在交错网格空间中采用高阶有限差分技术导出了应力-速度弹性波动方程正演的差分格式,研究了其吸收边界条件与数值频散关系,建立了煤田多波勘探的数学模型。在此基础上通过对特定模型的数值模拟,研究了纵波震源激发条件下弹性波在地下的传播规律与煤层多波记录的波场特征。数值模拟结果表明,当地表不存在低速层时,煤田多波记录的X分量与Z分量上均有纵波与横波存在,因此在资料处理中必须首先进行波场分离工作。在一定的厚度范围内,煤层转换波的能量还与煤层厚度有关。故在进行野外资料采集观测系统设计时,要综合考虑转换波和纵波的观测范围。

摘要：“地球物理场论”课程是勘查技术与工程专业的专业基础课。本文结合课程特点及教学现状,在以学习者为中心的教学理念指导下,对课程教学模式进行了新探索。按照教学目标,对课程框架体系进行了优化;按照布卢姆教育目标分类学理论,将授课内容进行了分类,设计了多元化的教学方式;依据教学内容,设计了多方位的全过程课程评价方式。通过教学实践,发现以学习者为中心的新教学模式提升了教学效果,激发了学生的学习潜能,增强了学生的深度学习的能力、创造性思考的能力及知识迁移的能力。

摘要：Using staggered-grid finite difference method to solve seismic wave equation,large spatial grid and high dominant frequency of source cause numerical dispersion,staggeredgrid finite difference method,which can reduce the step spatial size and increase the order of difference,will multiply the calculation amount and reduce the efficiency of solving wave *** optimal nearly analytic discrete(ONAD)method can accurately solve the wave equation by using the combination of displacement and gradient of spatial nodes to approach the spatial partial derivative under rough grid and high-frequency *** this study,the ONAD method is introduced into the field of reverse-time migration(RTM)for performing forward-and reverse-time extrapolation of a two-dimensional acoustic equation,and the RTM based on ONAD method is realized via normalized cross-correlation imaging condition,effectively suppressed the numerical dispersion and improved the imaging *** ONAD method to image the groove model and SEG/EAGE salt dome model by RTM,and comparing with the migration sections obtained by staggered-grid finite difference method with the same time order 2 nd and space order 4 th,results show that the RTM based on ONAD method can effectively suppress numerical dispersion caused by the high frequency components in source and shot records,and archive accurate imaging of complex geological structures especially the fine structure,and the migration sections of the measured data show that ONAD method has practical application value.