基于相控震源的深部矿体微弱信号增强方法
来源期刊：中国有色金属学报2013年第9期
论文作者：密士文 朱自强 彭凌星
文章页码：2388 - 2396
关键词：深部矿体；相控；地震波；数值模拟；微弱信号
Key words：deep mineral resources; phased array; seismic wave; numerical simulation; weak signals
摘 要：为有效探测深部矿体，研究地震波微弱信号增强技术至关重要。采用有限差分法，对不同震源激发方式产生的地震波场响应进行数值模拟。震源方向特征、单炮记录和单道反射波的对比结果表明：相对于单震源和组合震源，相控震源可以明显改变地震波场能量的分布，增强深部矿体微弱的反射信号。延迟参数不同，对微弱信号的增强能力也不同，可以根据需要设置合适的延迟参数。总体来说，相控震源可以为深部矿体勘探提供有利条件。
Abstract: To explore deep mineral resources effectively, the technology of improving weak signals is an essential technology for seismic waves. Finite-difference method was used for the numerical simulation of wave propagation and response of detector for different sources. By contrast of sources directional character, single shot records and single-channel reflected waves, the results show that phased array sources can change energy direction of seismic field obviously and enhance the reflected weak signals from deep mineral resources. For different delay parameters, the ability of improving weak signals is also different. Suitable delay parameters can be chosen in accordance with needs. On the whole, phased array sources can effectively improve the quality of seismic data from deep mineral resources.
密士文，朱自强，彭凌星
(中南大学 地球科学与信息物理学院，长沙 410083)
摘 要：为有效探测深部矿体，研究地震波微弱信号增强技术至关重要。采用有限差分法，对不同震源激发方式产生的地震波场响应进行数值模拟。震源方向特征、单炮记录和单道反射波的对比结果表明：相对于单震源和组合震源，相控震源可以明显改变地震波场能量的分布，增强深部矿体微弱的反射信号。延迟参数不同，对微弱信号的增强能力也不同，可以根据需要设置合适的延迟参数。总体来说，相控震源可以为深部矿体勘探提供有利条件。
关键词：深部矿体；相控；地震波；数值模拟；微弱信号
MI Shi-wen, ZHU Zi-qiang, PENG Ling-xing
(School of Geosciences and Info-Physics, Central South University, Changsha 410083, China)
Abstract:To explore deep mineral resources effectively, the technology of improving weak signals is an essential technology for seismic waves. Finite-difference method was used for the numerical simulation of wave propagation and response of detector for different sources. By contrast of sources directional character, single shot records and single-channel reflected waves, the results show that phased array sources can change energy direction of seismic field obviously and enhance the reflected weak signals from deep mineral resources. For different delay parameters, the ability of improving weak signals is also different. Suitable delay parameters can be chosen in accordance with needs. On the whole, phased array sources can effectively improve the quality of seismic data from deep mineral resources.
Key words:deep mineral resources; phased array; seismic wave; numerical simulation; weak signals
